A parallel receiving and transmitting method for multi-path space division signals of a digital phased array

Abstract

The application discloses a kind of digital phased array multi-path air-space signal parallel transceiving methods, including the receiving system and the transmitting system of radio frequency sampling digital phased array or intermediate frequency sampling digital phased array or baseband sampling digital phased array.In the receiving system, the analog radio frequency signal received by each antenna unit is converted into complex digital baseband receiving signal after downlink processing, and multiple parallel DBF receiving signal processing algorithms can be used to calculate multiple air-space complex digital baseband signals from different directions in parallel.In the transmitting system, the complex digital baseband transmitting signal of each uplink is calculated using multi-path parallel DBF transmitting signal processing algorithm, and the analog radio frequency signal is radiated by the corresponding antenna unit after the signal processing of uplink, which can transmit multiple air-space complex digital baseband signals in different directions in parallel.The method is suitable for the transceiving of various modulated signals, and the control accuracy of the transceiving pattern is higher than that of the analog active phased array transceiving pattern.

Description

Technical Field

[0001] The present invention relates to the technical field of digital phased array transceiver signal processing, and in particular to a method for parallel transceiver transmission of multi-path space division signals of a digital phased array. Background Art

[0002] The development of phased arrays has gone through three stages: analog passive phased arrays, analog active phased arrays, and digital phased arrays. Analog passive phased arrays use centralized power amplification, resulting in inflexible array pattern formation and poor system robustness. In analog active phased arrays, each antenna element is connected to an independent Transmitter / Reciprocating (T / R) assembly, employing distributed power amplification, making the system more robust. Analog active phased arrays utilize digitally controlled phase shifters and attenuators within the T / R assembly to directly control the amplitude and phase of the analog RF signal, thereby forming a specified transmit and receive array pattern. Because digitally controlled phase shifters and attenuators cannot simultaneously shift and attenuate multiple signals, analog active phased arrays cannot simultaneously receive multiple spatially separated signals from different directions or transmit multiple spatially separated signals in different directions. Furthermore, due to the limited phase shifting accuracy of the digitally controlled phase shifters and attenuation accuracy of the digitally controlled attenuators, the control accuracy of the transmit and receive patterns of analog active phased arrays is low. Summary of the Invention

[0003] The present invention provides a method for parallel reception and transmission of multi-channel space-division signals of a digital phased array. The method uses a digital phased array as its hardware basis and utilizes a method for parallel reception of multi-channel space-division signals to receive multi-channel space-division complex digital baseband signals from different directions in parallel. The method for parallel transmission of multi-channel space-division signals can transmit multi-channel space-division complex digital baseband signals in parallel to different directions. The control accuracy of the reception and transmission pattern is higher than that of the reception and transmission pattern of an analog active phased array.

[0004] A digital phased array, the technical solution of which is that the digital phased array adopts a radio frequency sampling digital phased array, an intermediate frequency sampling digital phased array, or a baseband sampling digital phased array, each antenna unit of the digital phased array is connected to a downlink and an uplink respectively through a duplexer, each downlink includes a limiter, a low noise amplifier (LNA), and an analog radio frequency signal converter connected in sequence, the input end of the limiter is connected to the output end of the duplexer, and each uplink includes a complex digital baseband transmission signal converter and a power amplifier connected in sequence, the output end of the power amplifier is connected to the input end of the duplexer;

[0005] If the digital phased array adopts the radio frequency sampling digital phased array, each analog radio frequency signal converter of the radio frequency sampling digital phased array comprises an analog-to-digital converter (ADC), a digital sinusoidal signal generator, a first digital multiplier, a first finite impulse response (FIR) low pass filter (LPF), a first decimator, a second digital multiplier, a second FIR LPF, a second decimator, and a complex digital baseband signal synthesizer, the same digital sinusoidal signal generator is adopted in all the analog radio frequency signal converters, an input end of the ADC is connected with an analog radio frequency signal output by the LNA, an output end of the ADC is connected with one input end of the first digital multiplier and one input end of the second digital multiplier, the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is connected with the other input end of the first digital multiplier, and the other of which is connected with the other input end of the second digital multiplier, an output end of the first digital multiplier is sequentially connected with the first FIR LPF, the first decimator, and one input end of the complex digital baseband signal synthesizer, an output end of the second digital multiplier is sequentially connected with the second FIR LPF, the second decimator, and the other input end of the complex digital baseband signal synthesizer, and an output end of the complex digital baseband signal synthesizer outputs a complex digital baseband receiving signal; each complex digital baseband transmitting signal converter of the radio frequency sampling digital phased array comprises a first digital-to-analog converter (DAC), a first ADC, a first digital multiplier, a second DAC, a second ADC, a second digital multiplier, a digital sinusoidal signal generator, a digital adder, and a third DAC, the same digital sinusoidal signal generator is adopted in all the complex digital baseband transmitting signal converters, a real part signal of the complex digital baseband transmitting signal is sequentially connected with the first DAC, the first ADC, and the first digital multiplier, an imaginary part signal of the complex digital baseband transmitting signal is sequentially connected with the second DAC, the second ADC, and the second digital multiplier, the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is connected with the other input end of the first digital multiplier, and the other of which is connected with the other input end of the second digital multiplier, an output end of the first digital multiplier is connected with one input end of the digital adder, an output end of the second digital multiplier is connected with the other input end of the digital adder, an output end of the digital adder is connected with the third DAC, and an output end of the third DAC outputs an analog radio frequency signal;

[0006] If the digital phased array adopts the intermediate frequency sampling digital phased array, each analog radio frequency signal converter of the intermediate frequency sampling digital phased array comprises an analog multiplier, an analog sine wave generator, an analog band pass filter (BPF), an ADC, a digital sine signal generator, a first digital multiplier, a first FIR LPF, a first decimator, a second digital multiplier, a second FIR LPF, a second decimator, and a complex digital baseband signal synthesizer, the same analog sine wave generator and the same digital sine signal generator are adopted in all the analog radio frequency signal converters, one input end of the analog multiplier is connected with the analog radio frequency signal output by the LNA, the other input end is connected with the output end of the analog sine wave generator, the output end of the analog multiplier is connected with the analog BPF and the ADC in sequence, the output end of the ADC is connected with one input end of the first digital multiplier and one input end of the second digital multiplier, the digital sine signal generator generates two mutually orthogonal digital sine signals, one is connected with the other input end of the first digital multiplier, and the other is connected with the other input end of the second digital multiplier, the output end of the first digital multiplier is connected with the first FIR LPF, the first decimator, and one input end of the complex digital baseband signal synthesizer in sequence, the output end of the second digital multiplier is connected with the second FIR LPF, the second decimator, and the other input end of the complex digital baseband signal synthesizer in sequence, and the output end of the complex digital baseband signal synthesizer outputs the complex digital baseband receiving signal; each complex digital baseband transmitting signal converter of the intermediate frequency sampling digital phased array comprises a first DAC, a first ADC, a first digital multiplier, a second DAC, a second ADC, a second digital multiplier, a digital sine signal generator, a digital adder, a third DAC, an analog multiplier, an analog sine wave generator, and an analog BPF, the same analog sine wave generator and the same digital sine signal generator are adopted in all the complex digital baseband transmitting signal converters, the real part signal of the complex digital baseband transmitting signal is connected with the first DAC, the first ADC, and the first digital multiplier in sequence, the imaginary part signal of the complex digital baseband transmitting signal is connected with the second DAC, the second ADC, and the second digital multiplier in sequence, the digital sine signal generator generates two mutually orthogonal digital sine signals, one is connected with the other input end of the first digital multiplier, and the other is connected with the other input end of the second digital multiplier, the output end of the first digital multiplier is connected with one input end of the digital adder, the output end of the second digital multiplier is connected with the other input end of the digital adder, the output end of the digital adder is connected with the third DAC, the output end of the third DAC is connected with the analog multiplier and the analog BPF in sequence, the output end of the analog sine wave generator is connected with the other input end of the analog multiplier, and the output end of the analog BPF outputs the analog radio frequency signal;

[0007] If the digital phased array adopts a baseband sampling digital phased array, each analog radio frequency signal converter of the baseband sampling digital phased array comprises a third analog multiplier, a first analog sine wave generator, an analog BPF, a second analog sine wave generator, a first analog multiplier, a first analog LPF, a first ADC, a second analog multiplier, a second analog LPF, a second ADC, and a complex digital baseband signal synthesizer, the same first analog sine wave generator and the same second analog sine wave generator are adopted in all the analog radio frequency signal converters, one input end of the third analog multiplier is connected with an analog radio frequency signal output by the LNA, the other input end is connected with an output end of the first analog sine wave generator, an output end of the third analog multiplier is connected with an input end of the analog BPF, an output end of the analog BPF is connected with one input end of the first analog multiplier and one input end of the second analog multiplier, the second analog sine wave generator generates two mutually orthogonal sine waves, one of which is connected with the other input end of the first analog multiplier, and the other of which is connected with the other input end of the second analog multiplier, the output end of the first analog multiplier is sequentially connected with the first analog LPF, the first ADC, and one input end of the complex digital baseband signal synthesizer, the output end of the second analog multiplier is sequentially connected with the second analog LPF, the second ADC, and the other input end of the complex digital baseband signal synthesizer, and an output end of the complex digital baseband signal synthesizer outputs a complex digital baseband receiving signal; each complex digital baseband transmitting signal converter of the baseband sampling digital phased array comprises a first DAC, a first analog multiplier, a second DAC, a second analog multiplier, a first analog sine wave generator, an analog adder, a third analog multiplier, a second analog sine wave generator, and an analog BPF, the same first analog sine wave generator and the same second analog sine wave generator are adopted in all the complex digital baseband transmitting signal converters, a real part signal of a complex digital baseband transmitting signal is sequentially connected with the first DAC and the first analog multiplier, an imaginary part signal of the complex digital baseband transmitting signal is sequentially connected with the second DAC and the second analog multiplier, the first analog sine wave generator generates two mutually orthogonal digital sine signals, one of which is connected with the other input end of the first analog multiplier, and the other of which is connected with the other input end of the second analog multiplier, an output end of the first analog multiplier is connected with one input end of the analog adder, an output end of the second analog multiplier is connected with the other input end of the analog adder, an output end of the analog adder is sequentially connected with the third analog multiplier and the analog BPF, an output end of the second analog sine wave generator is connected with the other input end of the third analog multiplier, and an output end of the analog BPF outputs an analog radio frequency signal.

[0008] The digital phased array has the following beneficial effects:

[0009] 1. When the digital phased array adopts the radio frequency sampling digital phased array, the analog radio frequency signal converter directly converts the analog radio frequency signal into a digital radio frequency signal, and the complex digital baseband transmitting signal converter directly converts the digital radio frequency signal into an analog radio frequency signal. The radio frequency sampling digital phased array adopts full-digital signal processing technology, thereby improving the integration, stability and reliability of the digital phased array.

[0010] 2. When the digital phased array adopts the intermediate frequency sampling digital phased array, the analog radio frequency signal converter converts the analog radio frequency signal into an analog intermediate frequency signal. The sampling of the analog intermediate frequency signal is easy to implement in engineering, and the data transmission rate of the digital intermediate frequency signal is low, and the subsequent digital signal processing is easy to implement. The complex digital baseband transmitting signal converter converts the digital intermediate frequency signal into an analog intermediate frequency signal, which is easy to implement in engineering, and the data transmission rate of the digital intermediate frequency signal is low, and the front-end digital signal processing is easy to implement.

[0011] 3. When the digital phased array adopts the baseband sampling digital phased array, the analog radio frequency signal converter converts the analog radio frequency signal into an analog intermediate frequency signal, and then converts the analog intermediate frequency signal into an analog baseband signal. The sampling of the analog baseband signal is easier to implement in engineering, and the data transmission rate of the digital baseband signal is lower, and the subsequent digital signal processing is easier to implement. The complex digital baseband transmitting signal converter converts the digital baseband into an analog baseband signal, which is easier to implement in engineering, and the data transmission rate of the digital baseband signal is lower, and the front-end digital signal processing is easier to implement.

[0012] A multi-path spatially separated signal parallel receiving method, which is based on a digital phased array as hardware. The antenna array of the digital phased array adopts a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array. The analog radio frequency signal output by the LNA in each downlink of the digital phased array is converted into a complex digital baseband receiving signal by an analog radio frequency signal converter. The complex digital baseband receiving signals output by each downlink are calculated in parallel to obtain multi-path spatially separated complex digital baseband signals from different directions by using a multi-path parallel digital beam forming (DBF) receiving signal processing algorithm. The specific implementation is as follows:

[0013] If the antenna array of the digital phased array adopts a one-dimensional linear array, the multi-path parallel DBF receiving signal processing algorithm of the one-dimensional linear array is as follows:

[0014]

[0015] If the antenna array of the digital phased array adopts a one-dimensional conformal array, a virtual one-dimensional linear array is constructed based on the one-dimensional conformal array. The multi-path parallel DBF receiving signal processing algorithm of the one-dimensional conformal array is as follows:

[0016]

[0017] wherein is the ith received spatially and temporally multiplexed complex digital baseband signal received by the ith receive pattern of the one-dimensional linear array or one-dimensional conformal array, n represents the antenna element of the one-dimensional linear array or one-dimensional conformal array and the downlink sequence number, is the complex digital baseband received signal output by the nth downlink of the one-dimensional linear array or one-dimensional conformal array, k represents the discrete time independent variable, θ i represents the angle between the main lobe direction of the ith receive pattern and the normal line of the one-dimensional linear array or virtual one-dimensional linear array, N represents the number of antenna elements of the one-dimensional linear array or virtual one-dimensional linear array, d represents the distance between adjacent antenna elements of the one-dimensional linear array or virtual one-dimensional linear array, W i (n) represents the window function of the one-dimensional linear array or virtual one-dimensional linear array corresponding to the ith receive pattern, f0 represents the carrier frequency of the analog radio frequency signal, c represents the speed of light, e represents the natural exponential symbol, j represents the imaginary unit, Δψ n and Δa n respectively represent the phase deviation value and the amplitude deviation percentage of the nth downlink of the one-dimensional linear array or one-dimensional conformal array, Δd ni represents the distance difference between the nth antenna element of the one-dimensional conformal array and the nth antenna element of the virtual one-dimensional linear array in the θ i direction;

[0018] The spatially and temporally multiplexed complex digital baseband signals from I directions θ i ,i = 1, 2, … I are calculated in parallel using formula (1) or formula (2)

[0019] If the antenna array of the digital phased array adopts a two-dimensional planar array, the two-dimensional planar array is composed of M rows of one-dimensional linear arrays from the horizontal direction and N columns of one-dimensional linear arrays from the vertical direction, m represents the row sequence number of the two-dimensional planar array, n represents the column sequence number of the two-dimensional planar array, and the multi-parallel DBF receive signal processing algorithm of the two-dimensional planar array is as follows:

[0020]

[0021] If the antenna array of the digital phased array adopts a two-dimensional conformal array, a virtual two-dimensional planar array is constructed based on the two-dimensional conformal array, the virtual two-dimensional planar array is composed of M rows of virtual one-dimensional linear arrays from the horizontal direction and N columns of virtual one-dimensional linear arrays from the vertical direction, m represents the row sequence number of the two-dimensional conformal array and the virtual two-dimensional planar array, n represents the column sequence number of the two-dimensional conformal array and the virtual two-dimensional planar array, and the multi-parallel DBF receive signal processing algorithm of the two-dimensional conformal array is as follows:

[0022]

[0023] wherein is the i-th received spatially-diverse complex digital baseband signal received by the i-th receive pattern of the two-dimensional planar array or the two-dimensional conformal array, is the complex digital baseband received signal outputted by the m-th row and n-th column antenna element of the two-dimensional planar array or the two-dimensional conformal array, θ i and φ i represent the elevation angle and the azimuth angle of the main lobe of the i-th receive pattern relative to the two-dimensional planar array or the virtual two-dimensional planar array, d x represents the distance between adjacent antenna elements of the longitudinal one-dimensional linear array or the virtual one-dimensional linear array, d y represents the distance between adjacent antenna elements of the transverse one-dimensional linear array or the virtual one-dimensional linear array, W i x (m) represents the window function of the longitudinal one-dimensional linear array or the virtual one-dimensional linear array corresponding to the i-th receive pattern, W i y (n) represents the window function of the transverse one-dimensional linear array or the virtual one-dimensional linear array corresponding to the i-th receive pattern, Δψ mn and Δa mn represent the phase deviation value and the amplitude deviation percentage of the downlink corresponding to the m-th row and n-th column antenna element of the two-dimensional planar array or the two-dimensional conformal array, Δd mni represents the distance difference between the m-th row and n-th column antenna element of the two-dimensional conformal array and the m-th row and n-th column antenna element of the virtual two-dimensional planar array in the direction of (θ i , φ i );

[0024] the multi-channel spatially-diverse complex digital baseband signals from I directions are calculated in parallel by using formula (3) or formula (4) wherein the main lobe of the i-th receive pattern points to the elevation angle θ i and the azimuth angle φ i relative to the two-dimensional planar array or the virtual two-dimensional planar array.

[0025] If the digital phased array is a radio frequency sampling digital phased array, the signal processing method of each downlink of the radio frequency sampling digital phased array is as follows: n represents the downlink and the antenna element number of the one-dimensional linear array or the one-dimensional conformal array or the two-dimensional planar array or the two-dimensional conformal array, represents the analog radio frequency signal outputted by the LNA in the n-th downlink, t represents the continuous time independent variable, cos(2πf0t) represents the carrier of the analog radio frequency signal, and represents the signal processing method of the n-th downlink. ​​The transmitted analog baseband modulated signal is All analog RF signal converters use the same sampling time interval T. s , T s The value must satisfy where f m represents the highest cutoff frequency of the analog radio frequency signal; The digital RF signal obtained by ADC is expressed as S n (l) indicates that Where l represents a discrete time independent variable; the same digital sinusoidal signal generator is used in all analog RF signal converters, and the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is O c (l)=2cos(2πf0T s l) indicates that the other way is represented by O s (l)=-2sin(2πf0T s l) indicates; S n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier is A n (l) indicates that A n (1) The output signal obtained by filtering out the high-frequency signal in the first FIRLPF is B n (l) indicates that S n (l) with O s (1) The output signal obtained after multiplication by the second digital multiplier is C n (l) indicates that C n (l) The output signal obtained by filtering out the high-frequency signal through the second FIR LPF is D n (l) indicates that In all analog RF signal converters, the first decimator and the second decimator use the same decimation interval; B n (1) The real digital baseband signal obtained by the first extractor is used Indicates that D n (1) The real digital baseband signal obtained by the second extractor is used Indicates that Where S is an integer representing the extraction interval of the extractor, and the value of S must satisfy The integer part of f b Represents the highest cutoff frequency of the analog baseband modulation signal; and The complex digital baseband signal synthesizer obtains but

[0026] It is the complex digital baseband received signal output by the nth downlink.

[0027] If the digital phased array adopts an intermediate frequency sampling digital phased array, the signal processing method of each downlink of the intermediate frequency sampling digital phased array is as follows: n represents the downlink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and represents the analog RF signal output by the LNA in the nth downlink, t represents a continuous time independent variable, cos(2πf0t) represents the carrier of the analog RF signal, and express The transmitted analog baseband modulated signal is The same analog sine wave generator is used in all analog RF signal converters. The analog sine wave generated by the analog sine wave generator is used to denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the analog multiplier is used express, The analog intermediate frequency signal obtained by filtering out the high frequency signal through the analog BPF is used Indicates that where f i =f0-f1 represents the carrier frequency of the analog intermediate frequency signal; ADC in all analog radio frequency signal converters uses the same sampling time interval T s , T s The value must satisfy where f m Represents the highest cutoff frequency of the analog intermediate frequency signal; The digital intermediate frequency signal obtained by ADC is n (l) indicates that Where l represents a discrete time independent variable; the same digital sinusoidal signal generator is used in all analog RF signal converters, and the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals and one channel is O c (l)=2cos(2πf i T s l) indicates that the other way is represented by O s (l)=-2sin(2πf i T s l) indicates; n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier is A n (l) indicates that A n(l) the output signal obtained by filtering out the high frequency signal in the first FIR LPF is denoted by B n (l) is denoted by B

[0028] I n (l) is denoted by B s (l) the output signal obtained by multiplying the signal after the second digital multiplier is denoted by C n (l) is denoted by C n (l) the output signal obtained by filtering out the high frequency signal in the second FIR LPF is denoted by D n (l) is denoted by D The first decimator and the second decimator in all analog radio frequency signal converters adopt the same decimation interval; B n (l) the real digital baseband signal obtained by the first decimator is denoted by (l) is denoted by D n (l) the real digital baseband signal obtained by the second decimator is denoted by (l) is denoted by where S is an integer representing the decimation interval of the decimator, the value of S must satisfy the integer part of b representing the highest cut-off frequency of the analog baseband modulation signal; and obtained by the complex digital baseband signal synthesizer (l) is denoted by

[0029] is the complex digital baseband received signal of the nth downlink output.

[0030] If the digital phased array adopts a baseband sampling digital phased array, the signal processing method of each downlink of the baseband sampling digital phased array is as follows: n represents the downlink and antenna element serial number of a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, and (l) represents the analog radio frequency signal output by the LNA in the nth downlink, t represents the continuous time independent variable, and cos(2πf0t) represents the carrier of the analog radio frequency signal (l) represents the transmitted analog baseband modulation signal, then The same first analog sinusoidal wave generator is adopted in all analog radio frequency signal converters, and the analog sinusoidal wave generated by the analog sinusoidal wave generator is denoted by where f1 represents the frequency of the analog sinusoidal wave; and (l) the output signal obtained by multiplying the signal after the third analog multiplier is denoted by (l) is denoted by An analog intermediate frequency signal filtered by the analog BPF to filter out high frequency signals therefrom is represented as wherein f i =f0-f1 represents a carrier frequency of the analog intermediate frequency signal; a second analog sinusoidal wave generator is used in all analog radio frequency signal converters, which generates two analog sinusoidal waves orthogonal to each other, one of which is represented as c (t)=2cos(2πf i t) and the other is represented as s (t)=-2sin(2πf i t); An output signal obtained by multiplying the O c (t) by a first analog multiplier is represented as A n (t), and an analog baseband signal obtained by filtering high frequency signals from the A n (t) by a first analog LPF is represented as B n (t), then An output signal obtained by multiplying the O s (t) by a second analog multiplier is represented as C n (t), and an analog baseband signal obtained by filtering high frequency signals from the C n (t) by a second analog LPF is represented as D n (t), then The first ADC and the second ADC use the same sampling time interval T s in all analog radio frequency signal converters, and the value of T s must satisfy f m represents the highest cut-off frequency of the analog baseband modulation signal; a real digital baseband signal obtained by the first ADC from the B n (t) is represented as A real digital baseband signal obtained by the second ADC from the D (t) is represented as and are obtained by a complex digital baseband signal synthesizer is the complex digital baseband receiving signal of the nth downlink output.

[0031] The beneficial effects of the parallel receiving method of the multiple spatial division signals are:

[0032] ​​​1. Since the complex digital baseband reception signals output by each downlink of the digital phased array can be dynamically stored, the multi-channel parallel DBF reception signal processing algorithm can receive multiple spatially divided complex digital baseband signals from different directions in parallel, while the analog active phased array cannot receive multiple spatially divided signals from different directions in parallel.

[0033] 2. The multi-channel parallel DBF receiving signal processing algorithm uses a digital signal processing algorithm to form multiple receiving directional patterns. The control accuracy of the receiving directional pattern depends on the digital signal processing accuracy. Compared with the analog active phased array, the control accuracy of the digital phased array receiving directional pattern is higher.

[0034] 3. In actual applications, due to consistency differences in signal processing for each downlink, all digital phased arrays must be calibrated before leaving the factory to obtain the phase deviation value and amplitude deviation percentage for each downlink. The multi-channel parallel DBF receive signal processing algorithm effectively utilizes the phase deviation value and amplitude deviation percentage of each downlink, eliminating the impact of the aforementioned consistency differences on multiple receive patterns. The multiple receive patterns formed by the multi-channel parallel DBF receive signal processing algorithm are more accurate.

[0035] 4. The multi-channel parallel DBF receiving signal processing algorithm is applicable to the reception of various modulated signals, and is particularly applicable to the reception of QAM modulated signals, because QAM modulated signals transmit information through the amplitude and phase of complex digital baseband receiving signals.

[0036] A method for parallel transmission of multi-channel space-division signals, the technical solution of which is as follows: the method uses a digital phased array as hardware foundation, the antenna array of the digital phased array adopts a one-dimensional linear array, a one-dimensional conformal array, a two-dimensional planar array, or a two-dimensional conformal array, and the multi-channel space-division complex digital baseband signals transmitted in different directions are calculated using a multi-channel parallel digital beamforming (DBF) transmission signal processing algorithm to obtain a complex digital baseband transmission signal for each uplink. After uplink signal processing, each complex digital baseband transmission signal is radiated into space by the corresponding antenna unit, forming multiple transmission patterns in the far field, and the multi-channel space-division complex digital baseband signals are transmitted in parallel in different directions. The specific solution is as follows:

[0037] If the antenna array of the digital phased array adopts a one-dimensional linear array, the multi-channel parallel DBF transmission signal processing algorithm of the one-dimensional linear array is as follows:

[0038]

[0039] If the antenna array of the digital phased array adopts a one-dimensional conformal array, a virtual one-dimensional linear array is constructed based on the one-dimensional conformal array. The multi-channel parallel DBF transmission signal processing algorithm of the one-dimensional conformal array is as follows:

[0040]

[0041] Where n represents the antenna element and uplink number of a one-dimensional linear array or a one-dimensional conformal array, represents the complex digital baseband transmission signal of the nth uplink of a one-dimensional linear array or a one-dimensional conformal array, is the i-th spatially divided complex digital baseband signal corresponding to the i-th transmission pattern, k represents the discrete time independent variable, θ i represents the angle between the main lobe of the i-th transmission pattern and the normal of the one-dimensional linear array or virtual one-dimensional linear array, I represents the number of multiple transmission patterns formed in parallel, N represents the number of antenna elements of the one-dimensional linear array or virtual one-dimensional linear array, d represents the spacing between adjacent antenna elements of the one-dimensional linear array or virtual one-dimensional linear array, and W i (n) represents the window function of the one-dimensional linear array or virtual one-dimensional linear array corresponding to the i-th transmission pattern, f0 represents the carrier frequency of the analog radio frequency signal, c represents the speed of light, e represents the natural exponential sign, j represents the imaginary unit, Δψ n and Δa n Represents the phase deviation value and amplitude deviation percentage of the nth uplink of a one-dimensional linear array or a one-dimensional conformal array, Δd ni Represents the nth antenna element of the one-dimensional conformal array and the nth antenna element of the virtual one-dimensional linear array at θ i Distance difference in direction;

[0042] The analog radio frequency signal is radiated into space by the nth antenna element of the nth uplink through the one-dimensional linear array or the one-dimensional conformal array;

[0043] If the antenna array of the digital phased array adopts a two-dimensional planar array, the two-dimensional planar array is composed of M rows of one-dimensional linear arrays from a horizontal perspective and N columns of one-dimensional linear arrays from a vertical perspective. m represents the row number of the two-dimensional planar array and n represents the column number of the two-dimensional planar array. The multi-channel parallel DBF transmission signal processing algorithm of the two-dimensional planar array is as follows:

[0044]

[0045] If the antenna array of the digital phased array adopts a two-dimensional conformal array, a virtual two-dimensional planar array is constructed based on the two-dimensional conformal array. The virtual two-dimensional planar array is composed of M rows of virtual one-dimensional linear arrays when viewed horizontally, and N columns of virtual one-dimensional linear arrays when viewed vertically. m represents the row number of the two-dimensional conformal array and the virtual two-dimensional planar array, and n represents the column number of the two-dimensional conformal array and the virtual two-dimensional planar array. The multi-channel parallel DBF transmission signal processing algorithm of the two-dimensional conformal array is as follows:

[0046]

[0047] wherein represents a complex digital baseband transmit signal of the uplink corresponding to the antenna element of the mth row and the nth column of the two-dimensional planar array or the two-dimensional conformal array, represents the ith spatially divided complex digital baseband signal of the uplink corresponding to the ith transmit pattern, θ i and φ i respectively represent the elevation angle and the azimuth angle of the main lobe of the ith transmit pattern relative to the two-dimensional planar array or the virtual two-dimensional planar array, I represents the number of the multiple transmit patterns formed in parallel, d x represents the spacing of the adjacent antenna elements of the longitudinal one-dimensional linear array or the virtual one-dimensional linear array, d y represents the spacing of the adjacent antenna elements of the transverse one-dimensional linear array or the virtual one-dimensional linear array, W i x (m) represents a window function of the longitudinal one-dimensional linear array or the virtual one-dimensional linear array corresponding to the ith transmit pattern, W i y (n) represents a window function of the transverse one-dimensional linear array or the virtual one-dimensional linear array corresponding to the ith transmit pattern, Δψ mn and Δa mn respectively represent the phase deviation value and the amplitude deviation percentage of the uplink corresponding to the antenna element of the mth row and the nth column of the two-dimensional planar array or the two-dimensional conformal array, Δd mni represents the distance difference between the antenna element of the mth row and the nth column of the two-dimensional conformal array and the antenna element of the mth row and the nth column of the virtual two-dimensional planar array in the direction with the elevation angle of θ i and the azimuth angle of φ i ;

[0048] an analog radio frequency signal is radiated from the antenna element of the mth row and the nth column to the space via the uplink corresponding to the antenna element of the mth row and the nth column of the two-dimensional planar array or the two-dimensional conformal array.

[0049] If the digital phased array adopts a radio frequency sampling digital phased array, the signal processing method of each uplink of the radio frequency sampling digital phased array is as follows: n represents the uplink and the antenna element number of the one-dimensional linear array or the one-dimensional conformal array or the two-dimensional planar array or the two-dimensional conformal array, the complex digital baseband transmit signal of the nth uplink is calculated by formula (5) or formula (6) or formula (7) or formula (8), A n (k) represents the amplitude signal of , A represents the phase signal of , A represents the real part signal of , A express The imaginary signal of The analog baseband signal obtained by the first DAC is expressed as n (t) represents, then The analog baseband signal obtained by the second DAC is C n (t) represents, then in Representative A n (k) The corresponding analog signal, represent The corresponding analog signal, t represents the continuous time independent variable; in all complex digital baseband transmission signal converters, the first ADC and the second ADC use the same sampling time interval T s , T s The value must satisfy where f m represents the highest cutoff frequency of the analog RF signal; B n (t) The digital radio frequency signal obtained by the first ADC is used as D n (l) indicates that C n (t) The digital RF signal obtained by the second ADC is expressed as E n (l) indicates that Where l represents a discrete time independent variable; the same digital sine signal generator is used in all complex digital baseband transmission signal converters, and the digital sine signal generator generates two mutually orthogonal digital sine signals, one of which is O c (l) = cos(2πf0T s l) indicates that the other is represented by O s (l)=-sin(2πf0T s l) indicates; D n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier and E n (l) with O s (1) The output signal obtained by multiplying by the second digital multiplier is added to the digital RF signal obtained by the digital adder. n (l) indicates that R n (1) The analog RF signal obtained by the third DAC is used Indicates that The analog RF signal output by the nth complex-to-digital baseband transmit signal converter; The analog radio frequency signal is radiated into space by the nth antenna unit through the power amplifier and the duplexer.

[0050] If the digital phased array adopts the intermediate frequency sampling digital phased array, the signal processing method of each uplink of the intermediate frequency sampling digital phased array is as follows: n represents the uplink and antenna element serial number of a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, the complex digital baseband transmitting signal of the nth uplink is represented as calculated by formula (5) or formula (6) or formula (7) or formula (8), A n (k) represents the amplitude signal of A , B represents the phase signal of A , B represents the real part signal of A , B represents the imaginary part signal of A The analog baseband signal obtained through the first DAC is represented as B n (t), then The analog baseband signal obtained through the second DAC is represented as C n (t), then wherein represents the analog signal corresponding to A n (k), represents the analog signal corresponding to B , t represents the continuous time independent variable; the same digital sine signal generator is adopted in all complex digital baseband transmitting signal converters, which generates two mutually orthogonal digital sine signals, one of which is represented as O c (l) = cos(2πf i T s l), and the other is represented as O s (l) = -sin(2πf i T s l), wherein f i represents the carrier frequency of the analog intermediate frequency signal, and l represents the discrete time independent variable; the same sampling time interval T s is adopted for the first ADC and the second ADC in all complex digital baseband transmitting signal converters s , and the value of T wherein f m represents the highest cut-off frequency of the analog intermediate frequency signal; the digital intermediate frequency signal obtained through the first ADC of B n (t) is represented as D n (l), then the digital intermediate frequency signal obtained through the second ADC of C n (t) is represented as E n (l), then D n (l) the output signal after multiplication by the first digital multiplier is represented by E c (l) the output signal after multiplication by the second digital multiplier is represented by F n (l) the output signal after multiplication by the second digital multiplier is represented by F s (l) the digital intermediate frequency signal obtained by the digital adder is represented by I n (l) is represented by I I n (l) the analog intermediate frequency signal obtained by the third DAC is represented by I is represented by I An analog sine wave generator is used in all the complex digital baseband signal converters, and the analog sine wave generated by the analog sine wave generator is represented by where f1 represents the frequency of the analog sine wave; is represented by the output signal after multiplication by the analog multiplier is represented by the analog radio frequency signal obtained by filtering out the low frequency signal in the analog BPF is represented by is represented by where f0 = f1 + f i is the carrier frequency of the analog radio frequency signal, is the analog radio frequency signal output by the nth complex digital baseband signal converter; The analog radio frequency signal is radiated by the nth antenna unit to the space through a power amplifier and a duplexer.

[0051] If the digital phased array adopts a baseband sampling digital phased array, the signal processing method of each uplink of the baseband sampling digital phased array is as follows: n represents the uplink and antenna unit sequence number of a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, and the complex digital baseband signal of the nth uplink is represented by calculated by formula (5) or formula (6) or formula (7) or formula (8), represented by A n (k) is represented by A the amplitude signal of A is represented by A the phase signal of A is represented by A the real part signal of A is represented by A the imaginary part signal of A the analog baseband signal obtained by the first DAC is represented by B n (t) is represented by B the analog baseband signal obtained by the second DAC is represented by C n (t) is represented by C ​wherein represents A n (k) the corresponding analog signal, represents the corresponding analog signal, t represents a continuous time independent variable; a same first analog sine wave generator is used in all the complex digital baseband signal converters, which generates two mutually orthogonal analog sine waves, one of which is represented by O c (t) = cos(2πf i t), and the other is represented by O s (t) = -sin(2πf i t), wherein f i represents the frequency of the analog sine wave; B n (t) and O c (t) are multiplied by a first analog multiplier to obtain an output signal, and C n (t) and O s (t) are multiplied by a second analog multiplier to obtain an output signal, and the analog intermediate frequency signal obtained by an analog adder is represented by ; a same second analog sine wave generator is used in all the complex digital baseband signal converters, which generates an analog sine wave represented by , wherein f1 represents the frequency of the analog sine wave; and are multiplied by a third analog multiplier to obtain an output signal represented by ; an analog radio frequency signal obtained by filtering out low frequency signals in the analog intermediate frequency signal by an analog BPF is represented by ; wherein f0 = f1 + f i is the carrier frequency of the analog radio frequency signal, is the analog radio frequency signal output by the nth complex digital baseband signal converter; the analog radio frequency signal is radiated by the nth antenna unit to space through a power amplifier and a duplexer.

[0052] The multi-path parallel space division signal transmission method has the following advantages:

[0053] 1. The multi-path parallel DBF signal processing algorithm is used, and the complex digital baseband signal of each uplink of the digital phased array contains the amplitude and phase information of the multi-path space division complex digital baseband signals, so that the digital phased array can transmit the multi-path complex digital baseband signals in different directions in parallel, while the analog active phased array cannot transmit the multi-path space division signals in different directions in parallel.

[0054] 2、The multi-parallel DBF transmit signal processing algorithm utilizes digital signal processing algorithm to form multiple transmit patterns, the control precision of the transmit patterns depends on the digital signal processing precision, and the control precision of the digital phased array transmit patterns is higher than that of the analog active phased array.

[0055] 3、In practical application, due to the consistency difference of the signal processing of each uplink, all the digital phased arrays must be calibrated before leaving the factory to obtain the phase deviation value and the amplitude deviation percentage of each uplink, the multi-parallel DBF transmit signal processing algorithm effectively utilizes the phase deviation value and the amplitude deviation percentage of each uplink, eliminates the influence of the consistency difference on the multiple transmit patterns, and the multiple transmit patterns formed by the multi-parallel DBF transmit signal processing algorithm are more accurate.

[0056] 4、The multi-parallel DBF transmit signal processing algorithm is suitable for the transmission of various modulation signals, and is particularly suitable for the transmission of QAM modulation signals, because the QAM modulation signal transmits information through the amplitude and phase of the complex digital baseband transmit signal. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application and the prior art, the drawings needed to be used in the description of the embodiments of the present application and the prior art are briefly introduced as follows. The drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0058] Figure 1 Digital phased array and its transceiver signal processing flowchart;

[0059] Figure 2 Analog radio frequency signal converter of radio frequency sampling digital phased array and its signal processing flowchart;

[0060] Figure 3 Analog radio frequency signal converter of intermediate frequency sampling digital phased array and its signal processing flowchart;

[0061] Figure 4 Analog radio frequency signal converter of baseband sampling digital phased array and its signal processing flowchart;

[0062] Figure 5 Complex digital baseband transmit signal converter of radio frequency sampling digital phased array and its signal processing flowchart;

[0063] Figure 6 Complex digital baseband transmit signal converter of intermediate frequency sampling digital phased array and its signal processing flowchart;

[0064] Figure 7A complex digital baseband transmitting signal converter of a baseband sampling digital phased array and a signal processing flowchart thereof

[0065] Figure 8 A structural schematic diagram of a one-dimensional linear array

[0066] Figure 9 A structural schematic diagram of a two-dimensional planar array. DETAILED DESCRIPTION

[0067] The technical solutions of the present application will be described clearly and completely in combination with the drawings in the present application. The following description is only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0068] A digital phased array, the technical solution of which is that the digital phased array adopts a radio frequency sampling digital phased array or an intermediate frequency sampling digital phased array or a baseband sampling digital phased array, referring to Figure 1 Each antenna unit of the digital phased array is connected with a downlink and an uplink through a duplexer respectively, each downlink comprises a limiter, a low noise amplifier (LNA) and an analog radio frequency signal converter connected in sequence, the input end of the limiter is connected with the output end of the duplexer, each uplink comprises a complex digital baseband transmitting signal converter and a power amplifier connected in sequence, the output end of the power amplifier is connected with the input end of the duplexer; the differences among the radio frequency sampling digital phased array, the intermediate frequency sampling digital phased array and the baseband sampling digital phased array are only in their respective analog radio frequency signal converters and complex digital baseband transmitting signal converters, other devices are the same;

[0069] If the digital phased array adopts the radio frequency sampling digital phased array, referring to Figure 2The radio frequency sampling digital phased array each analog radio frequency signal converter comprises an analog-to-digital converter (ADC), a digital sinusoidal signal generator, a first digital multiplier, a first finite impulse response (FIR) low pass filter (LPF), a first decimator, a second digital multiplier, a second FIR LPF, a second decimator, and a complex digital baseband signal synthesizer; the same digital sinusoidal signal generator is used in all the analog radio frequency signal converters; the input end of the ADC is connected with the analog radio frequency signal output by the LNA; the output end of the ADC is connected with one input end of the first digital multiplier and one input end of the second digital multiplier; the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is connected with the other input end of the first digital multiplier, and the other of which is connected with the other input end of the second digital multiplier; the output end of the first digital multiplier is sequentially connected with the first FIR LPF, the first decimator, and one input end of the complex digital baseband signal synthesizer; the output end of the second digital multiplier is sequentially connected with the second FIR LPF, the second decimator, and the other input end of the complex digital baseband signal synthesizer; and the output end of the complex digital baseband signal synthesizer outputs a complex digital baseband receiving signal. Figure 5 The radio frequency sampling digital phased array each complex digital baseband transmitting signal converter comprises a first digital-to-analog converter (DAC), a first ADC, a first digital multiplier, a second DAC, a second ADC, a second digital multiplier, a digital sinusoidal signal generator, a digital adder, and a third DAC; the same digital sinusoidal signal generator is used in all the complex digital baseband transmitting signal converters; the real part signal of the complex digital baseband transmitting signal is sequentially connected with the first DAC, the first ADC, and the first digital multiplier; the imaginary part signal of the complex digital baseband transmitting signal is sequentially connected with the second DAC, the second ADC, and the second digital multiplier; the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is connected with the other input end of the first digital multiplier, and the other of which is connected with the other input end of the second digital multiplier; the output end of the first digital multiplier is connected with one input end of the digital adder; the output end of the second digital multiplier is connected with the other input end of the digital adder; the output end of the digital adder is connected with the third DAC; and the output end of the third DAC outputs an analog radio frequency signal.

[0070] If the digital phased array is an intermediate frequency sampling digital phased array, the radio frequency sampling digital phased array each analog radio frequency signal converter comprises an analog-to-digital converter (ADC), a digital sinusoidal signal generator, a first digital multiplier, a first finite impulse response (FIR) low pass filter (LPF), a first decimator, a second digital multiplier, a second FIR LPF, a second decimator, and a complex digital baseband signal synthesizer; the same digital sinusoidal signal generator is used in all the analog radio frequency signal converters; the input end of the ADC is connected with the analog radio frequency signal output by the LNA; the output end of the ADC is connected with one input end of the first digital multiplier and one input end of the second digital multiplier; the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is connected with the other input end of the first digital multiplier, and the other of which is connected with the other input end of the second digital multiplier; the output end of the first digital multiplier is sequentially connected with the first FIR LPF, the first decimator, and one input end of the complex digital baseband signal synthesizer; the output end of the second digital multiplier is sequentially connected with the second FIR LPF, the second decimator, and the other input end of the complex digital baseband signal synthesizer; and the output end of the complex digital baseband signal synthesizer outputs a complex digital baseband receiving signal. Figure 3, each analog radio frequency signal converter of the intermediate frequency sampling digital phased array includes an analog multiplier, an analog sine wave generator, an analog band pass filter (BPF), an ADC, a digital sine signal generator, a first digital multiplier, a first FIR LPF, a first decimator, a second digital multiplier, a second FIR LPF, a second decimator, a complex digital baseband signal synthesizer, the same analog sine wave generator and the same digital sine signal generator are used in all the analog radio frequency signal converters, one input end of the analog multiplier is connected with the analog radio frequency signal output by the LNA, the other input end is connected with the output end of the analog sine wave generator, the output end of the analog multiplier is connected with the analog BPF and the ADC in sequence, the output end of the ADC is connected with one input end of the first digital multiplier and one input end of the second digital multiplier, the digital sine signal generator generates two mutually orthogonal digital sine signals, one is connected with the other input end of the first digital multiplier, and the other is connected with the other input end of the second digital multiplier, the output end of the first digital multiplier is connected with the first FIR LPF, the first decimator and one input end of the complex digital baseband signal synthesizer in sequence, the output end of the second digital multiplier is connected with the second FIR LPF, the second decimator and the other input end of the complex digital baseband signal synthesizer in sequence, and the output end of the complex digital baseband signal synthesizer outputs the complex digital baseband receiving signal; with reference to Figure 6 , each complex digital baseband transmitting signal converter of the intermediate frequency sampling digital phased array includes a first DAC, a first ADC, a first digital multiplier, a second DAC, a second ADC, a second digital multiplier, a digital sine signal generator, a digital adder, a third DAC, an analog multiplier, an analog sine wave generator and an analog BPF, the same analog sine wave generator and the same digital sine signal generator are used in all the complex digital baseband transmitting signal converters, the real part signal of the complex digital baseband transmitting signal is connected with the first DAC, the first ADC and the first digital multiplier in sequence, the imaginary part signal of the complex digital baseband transmitting signal is connected with the second DAC, the second ADC and the second digital multiplier in sequence, the digital sine signal generator generates two mutually orthogonal digital sine signals, one is connected with the other input end of the first digital multiplier, and the other is connected with the other input end of the second digital multiplier, the output end of the first digital multiplier is connected with one input end of the digital adder, the output end of the second digital multiplier is connected with the other input end of the digital adder, the output end of the digital adder is connected with the third DAC, the output end of the third DAC is connected with the analog multiplier and the analog BPF in sequence, the output end of the analog sine wave generator is connected with the other input end of the analog multiplier, and the output end of the analog BPF outputs the analog radio frequency signal;

[0071] if the digital phased array adopts the baseband sampling digital phased array, with reference to Figure 4The baseband sampling digital phased array each analog radio frequency signal converter comprises a third analog multiplier, a first analog sine wave generator, an analog BPF, a second analog sine wave generator, a first analog multiplier, a first analog LPF, a first ADC, a second analog multiplier, a second analog LPF, a second ADC, and a complex digital baseband signal synthesizer, the same first analog sine wave generator and the same second analog sine wave generator are used in all analog radio frequency signal converters, one input end of the third analog multiplier is connected with the analog radio frequency signal output by the LNA, the other input end is connected with the output end of the first analog sine wave generator, the output end of the third analog multiplier is connected with the input end of the analog BPF, the output end of the analog BPF is connected with one input end of the first analog multiplier and one input end of the second analog multiplier, the second analog sine wave generator generates two mutually orthogonal sine waves, one is connected with the other input end of the first analog multiplier, and the other is connected with the other input end of the second analog multiplier, the output end of the first analog multiplier is sequentially connected with the first analog LPF, the first ADC, and one input end of the complex digital baseband signal synthesizer, the output end of the second analog multiplier is sequentially connected with the second analog LPF, the second ADC, and the other input end of the complex digital baseband signal synthesizer, and the output end of the complex digital baseband signal synthesizer outputs a complex digital baseband receiving signal. Figure 7 The baseband sampling digital phased array each complex digital baseband transmitting signal converter comprises a first DAC, a first analog multiplier, a second DAC, a second analog multiplier, a first analog sine wave generator, an analog adder, a third analog multiplier, a second analog sine wave generator, and an analog BPF, the same first analog sine wave generator and the same second analog sine wave generator are used in all complex digital baseband transmitting signal converters, the real part signal of the complex digital baseband transmitting signal is sequentially connected with the first DAC and the first analog multiplier, the imaginary part signal of the complex digital baseband transmitting signal is sequentially connected with the second DAC and the second analog multiplier, the first analog sine wave generator generates two mutually orthogonal digital sine signals, one is connected with the other input end of the first analog multiplier, and the other is connected with the other input end of the second analog multiplier, the output end of the first analog multiplier is connected with one input end of the analog adder, the output end of the second analog multiplier is connected with the other input end of the analog adder, the output end of the analog adder is sequentially connected with the third analog multiplier and the analog BPF, the output end of the second analog sine wave generator is connected with the other input end of the third analog multiplier, and the output end of the analog BPF outputs an analog radio frequency signal.

[0072] A multi-channel spatially separated signal parallel receiving method, which is based on a digital phased array, and the antenna array of the digital phased array adopts a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, and the multi-channel spatially separated signal parallel receiving method comprises the steps of Figure 1, the analog radio frequency signals outputted by the LNAs in each downlink of the digital phased array are converted into complex digital baseband receive signals by the analog radio frequency signal converters, and the complex digital baseband receive signals outputted by each downlink are calculated in parallel to obtain multiple spatially separated complex digital baseband signals from different directions by using a multi-parallel digital beam forming (DBF) receive signal processing algorithm, which is as follows:

[0073] If the antenna array of the digital phased array is a one-dimensional linear array, referring to Figure 8 , the multi-parallel DBF receive signal processing algorithm of the one-dimensional linear array is as follows:

[0074]

[0075] wherein is the ith spatially separated complex digital baseband signal received by the ith receive pattern of the one-dimensional linear array, n represents the serial number of the antenna element and the downlink of the one-dimensional linear array, is the complex digital baseband receive signal outputted by the nth downlink of the one-dimensional linear array, k is an integer representing the discrete time variable, θ i represents the angle between the main lobe of the ith receive pattern and the normal line of the one-dimensional linear array, N represents the number of the antenna elements of the one-dimensional linear array, d represents the distance between the adjacent antenna elements of the one-dimensional linear array, W i (n) represents the window function of the one-dimensional linear array corresponding to the ith receive pattern, the commonly used window functions include the rectangular window function, the Taylor window function, the Hamming window function, the Chebyshev window function, etc., f0 represents the carrier frequency of the analog radio frequency signal, c represents the speed of light, e represents the natural exponential symbol, j represents the imaginary unit, Δψ n and Δa n respectively represent the phase deviation value and the amplitude deviation percentage of the nth downlink of the one-dimensional linear array, the values of Δψ n and Δa n are obtained during the downlink calibration of the digital phased array; (Note: the phase deviation value and the amplitude deviation percentage of each downlink of all the digital phased arrays must be calibrated and measured before leaving the factory)

[0076] the multiple spatially separated complex digital baseband signals from I directions θ i , i = 1, 2, … I are calculated in parallel by using formula (1) wherein I represents the number of the one-dimensional linear array parallelly forming multiple receive patterns;

[0077] If the antenna array of the digital phased array is a one-dimensional conformal array, a virtual one-dimensional linear array is constructed based on the one-dimensional conformal array, and the multi-parallel DBF receive signal processing algorithm of the one-dimensional conformal array is as follows:

[0078]

[0079] wherein is the ith received spatially separated complex digital baseband signal received by the ith receive pattern of the one-dimensional conformal array, n represents the antenna element and downlink number of the one-dimensional conformal array, is the complex digital baseband received signal output by the nth downlink of the one-dimensional conformal array, θ i represents the angle between the main lobe pointing direction of the ith receive pattern and the normal line of the virtual one-dimensional linear array, N represents the number of antenna elements of the virtual one-dimensional linear array, d represents the distance between adjacent antenna elements of the virtual one-dimensional linear array, W i (n) represents the window function of the virtual one-dimensional linear array corresponding to the ith receive pattern, Δd ni represents the distance difference between the nth antenna element of the one-dimensional conformal array and the nth antenna element of the virtual one-dimensional linear array in the θ i direction, Δψ n and Δa n respectively represent the phase deviation value and the amplitude deviation percentage of the nth downlink of the one-dimensional conformal array, Δψ n and Δa n are obtained during the downlink calibration of the digital phased array;

[0080] The multi-channel spatially separated complex digital baseband signals from I directions θ i , i = 1, 2, … I are calculated in parallel using formula (2) wherein I represents the number of receive patterns formed in parallel by the one-dimensional conformal array;

[0081] If the antenna array of the digital phased array is a two-dimensional planar array, referring to Figure 9 , the two-dimensional planar array is composed of M rows of one-dimensional linear arrays from the horizontal direction and N columns of one-dimensional linear arrays from the vertical direction, wherein m represents the row number of the two-dimensional planar array, n represents the column number of the two-dimensional planar array, and the multi-channel parallel DBF receive signal processing algorithm of the two-dimensional planar array is as follows:

[0082]

[0083] wherein is the ith received spatially separated complex digital baseband signal received by the ith receive pattern of the two-dimensional planar array, is the complex digital baseband received signal output by the antenna element of the mth row and the nth column of the two-dimensional planar array, θ i and φ i respectively represent the pitch angle and the azimuth angle of the main lobe pointing direction of the ith receive pattern, d x represents the distance between adjacent antenna elements of the vertical one-dimensional linear array, d yW represents the spacing of adjacent antenna elements of the transverse one-dimensional linear array i x (m) W represents the window function of the longitudinal one-dimensional linear array corresponding to the i-th receiving pattern i y (n) represents the window function of the transverse one-dimensional linear array corresponding to the i-th receiving pattern mn and Δa mn respectively represent the phase deviation value and the amplitude deviation percentage of the downlink corresponding to the antenna element of the m-th row and the n-th column of the two-dimensional planar array, Δψ mn and Δa mn are obtained during the downlink calibration of the digital phased array;

[0084] The multi-path spatially-division complex digital baseband signals from I receiving directions are calculated in parallel using formula (3) wherein represents that the main lobe of the i-th receiving pattern is directed at the elevation angle θ i and the azimuth angle φ i of the two-dimensional planar array, and I represents the number of the two-dimensional planar array forming multiple receiving patterns in parallel,

[0085] If the antenna array of the digital phased array adopts a two-dimensional conformal array, a virtual two-dimensional planar array is constructed based on the two-dimensional conformal array, the virtual two-dimensional planar array is composed of M rows of virtual one-dimensional linear arrays from the transverse direction and N columns of virtual one-dimensional linear arrays from the longitudinal direction, m represents the row sequence number of the two-dimensional conformal array and the virtual two-dimensional planar array, and n represents the column sequence number of the two-dimensional conformal array and the virtual two-dimensional planar array, and the multi-path parallel DBF receiving signal processing algorithm of the two-dimensional conformal array is as follows:

[0086]

[0087] wherein represents the i-th path spatially-division complex digital baseband signal received by the i-th receiving pattern of the two-dimensional conformal array,

[0088] is the complex digital baseband receiving signal output by the downlink corresponding to the antenna element of the m-th row and the n-th column of the two-dimensional conformal array, θ i and φ i respectively represent the elevation angle and the azimuth angle of the main lobe of the i-th receiving pattern relative to the virtual two-dimensional planar array, Δd mni represents the distance difference in the (θ i , φ i ) direction between the antenna element of the m-th row and the n-th column of the two-dimensional conformal array and the antenna element of the m-th row and the n-th column of the virtual two-dimensional planar array, the main lobe of the i-th receive pattern is directed to the elevation angle of the virtual two-dimensional planar array as θ i , the azimuth angle as φ i , d x represents the distance between adjacent antenna elements of the longitudinal virtual one-dimensional linear array, d y represents the distance between adjacent antenna elements of the transverse virtual one-dimensional linear array, W i x (m) represents the window function of the longitudinal virtual one-dimensional linear array corresponding to the i-th receive pattern, W i y (n) represents the window function of the transverse virtual one-dimensional linear array corresponding to the i-th receive pattern, Δψ mn and Δa mn respectively represent the phase deviation value and the amplitude deviation percentage of the downlink corresponding to the antenna element of the m-th row and the n-th column of the two-dimensional conformal array, Δψ mn and Δa mn are obtained in the downlink calibration of the digital phased array;

[0089] the multi-path spatially-divisional complex digital baseband signals from I directions are calculated in parallel by using formula (4) wherein I represents the number of the two-dimensional conformal array forming multiple receive patterns in parallel.

[0090] if the digital phased array is a radio frequency sampling digital phased array, referring to Figure 2 , the signal processing method of each downlink of the radio frequency sampling digital phased array is as follows: n represents the downlink and the antenna element number of the one-dimensional linear array or the one-dimensional conformal array or the two-dimensional planar array or the two-dimensional conformal array, S represents the analog radio frequency signal output by the LNA in the n-th downlink, t represents the continuous time independent variable, without loss of generality, cos(2πf0t) represents the carrier of the analog radio frequency signal, and S represents the analog baseband modulated signal transmitted by , then wherein R n (t) is the amplitude signal of , and φ is the phase signal of ; the same sampling time interval T s is adopted by the ADC in all analog radio frequency signal converters, and the value of T s must satisfy wherein f m represents the highest cut-off frequency of the analog radio frequency signal; the digital radio frequency signal obtained by the ADC is represented by S n (l), then Where l is an integer representing a discrete time independent variable; the same digital sinusoidal signal generator is used in all analog RF signal converters, and the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals. Without loss of generality, one channel is O c (l)=2cos(2πf0T s l) indicates that the other is represented by O s (l)=-2sin(2πf0T s l) indicates; S n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier is A n (l) indicates that A n (1) The high-frequency signal is filtered out by the first FIR LPF The output signal is obtained by B n (l) indicates that S n (l) with O s (1) The output signal obtained after multiplication by the second digital multiplier is C n (l) indicates that C n (l) The high-frequency signal is filtered out by the second FIR LPF The output signal obtained is expressed as D n (l) indicates that In all analog RF signal converters, the first decimator and the second decimator use the same decimation interval; B n (1) The real digital baseband signal obtained by the first extractor is used Indicates that D n (1) The real digital baseband signal obtained by the second extractor is used Indicates that Where S is an integer representing the extraction interval of the extractor, and the value of S must satisfy The integer part of f b Represents the highest cutoff frequency of the analog baseband modulation signal; and The complex digital baseband signal synthesizer obtains but The complex digital baseband signal synthesizer synthesizes two real digital baseband signals into one complex digital baseband signal. is the complex digital baseband received signal output by the nth downlink, Amplitude signal yes The amplitude signal R n (t) is the sampling signal, Phase signal yes Phase signal The sampling signal.

[0091] If the digital phased array uses an intermediate frequency sampling digital phased array, refer to Figure 3 The signal processing method for each downlink of the intermediate frequency sampling digital phased array is as follows: n represents the downlink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and represents the analog RF signal output by the LNA in the nth downlink, t represents a continuous time independent variable, without loss of generality, cos(2πf0t) is used to represent the carrier of the analog RF signal, and express The transmitted analog baseband modulated signal is in for The amplitude signal, for Phase signal; the same analog sine wave generator is used in all analog RF signal converters. Without loss of generality, the analog sine wave generated by the analog sine wave generator is used denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the analog multiplier is used Indicates that The high-frequency signal is filtered out by analog BPF The obtained analog intermediate frequency signal is used Indicates that where f i =f0-f1 represents the carrier frequency of the analog intermediate frequency signal; ADC in all analog radio frequency signal converters uses the same sampling time interval T s , T s The value must satisfy where f m Represents the highest cutoff frequency of the analog intermediate frequency signal; The digital intermediate frequency signal obtained by ADC is n (l) indicates that Where l is an integer representing a discrete time independent variable; the same digital sinusoidal signal generator is used in all analog RF signal converters, and the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals. Without loss of generality, one channel is O c (l)=2cos(2πf i T s l) indicates that the other is represented by O s(l) = -2sin(2πf i T s l) represents; I n (l) and O c (l) after being multiplied by the first digital multiplier, is denoted as A n (l) represents, then A n (l) is filtered by the first FIR LPF to remove the high frequency signal therein the output signal is denoted as B n (l) represents, then I n (l) and O s (l) after being multiplied by the second digital multiplier, is denoted as C n (l) represents, then C n (l) is filtered by the second FIR LPF to remove the high frequency signal therein the output signal is denoted as D n (l) represents, then In all analog radio frequency signal converters, the first decimator and the second decimator adopt the same decimation interval; B n the real digital baseband signal obtained by the first decimator is denoted as (l) represents, then D n the real digital baseband signal obtained by the second decimator is denoted as (l) represents, then wherein S is an integer representing the decimation interval of the decimator, the value of S must satisfy the integer part of f b represents the highest cut-off frequency of the analog baseband modulation signal; and obtained by the complex digital baseband signal synthesizer then wherein is the complex digital baseband receiving signal of the nth downlink output, is the amplitude signal of is the amplitude signal R of n is the sampling signal of is the phase signal of is the phase signal of the sampling signal of.

[0092] If the digital phased array adopts a baseband sampling digital phased array, refer to Figure 4The signal processing method for each downlink of the baseband sampling digital phased array is as follows: n represents the downlink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and represents the analog RF signal output by the LNA in the nth downlink, t represents a continuous time independent variable, without loss of generality, cos(2πf0t) is used to represent the carrier of the analog RF signal, and express The transmitted analog baseband modulated signal is where R n (t) is The amplitude signal, for Phase signal; using the same first analog sine wave generator in all analog RF signal converters, without loss of generality, the analog sine wave generator generates an analog sine wave with denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the third analog multiplier is used Indicates that The high-frequency signal is filtered out by analog BPF The obtained analog intermediate frequency signal is used Indicates that where f i =f0-f1 represents the carrier frequency of the analog intermediate frequency signal; the same second analog sine wave generator is used in all analog radio frequency signal converters, and the analog sine wave generator generates two mutually orthogonal analog sine waves. Without loss of generality, one channel is O c (t)=2cos(2πf i t) indicates that the other way is represented by O s (t)=-2sin(2πf i t) indicates; With O c (t) The output signal obtained after multiplication by the first analog multiplier is A n (t) represents, then A n (t) The high-frequency signal is filtered out by the first analog LPF The analog baseband signal obtained is expressed as B n (t) represents, then With O s (t) The output signal obtained after multiplication by the second analog multiplier is C n (t) represents, then C n(t) The high-frequency signal is filtered out by the second analog LPF The analog baseband signal obtained is D n (t) represents, then In all analog RF signal converters, the first ADC and the second ADC use the same sampling time interval T s , T s The value must satisfy f m represents the highest cutoff frequency of the analog baseband modulation signal; B n (t) The real digital baseband signal obtained by the first ADC is used Indicates that D n (t) The real digital baseband signal obtained by the second ADC is used Indicates that and The complex digital baseband signal synthesizer obtains

[0093] but in is the complex digital baseband received signal output by the nth downlink, The amplitude signal Rn(Tsk)=Rn(t)t= Ts k is The sampling signal of the amplitude signal Rn(t) is Phase signal yes Phase signal The sampling signal.

[0094] A multi-channel space division signal parallel transmission method, the multi-channel space division signal parallel transmission method is based on a digital phased array hardware, the digital phased array antenna array adopts a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, Figure 1 The multi-path spatially divided complex digital baseband signals transmitted in different directions are processed using a multi-path parallel digital beamforming (DBF) transmit signal processing algorithm to calculate the complex digital baseband transmit signal for each uplink. After uplink signal processing, each complex digital baseband transmit signal is radiated into space by the corresponding antenna unit, forming multiple transmission patterns in the far field. The multi-path spatially divided complex digital baseband signals are transmitted in parallel in different directions. The details are as follows:

[0095] If the antenna array of the digital phased array adopts a one-dimensional linear array, refer to Figure 8 , the multi-channel parallel DBF transmission signal processing algorithm of one-dimensional linear array is as follows:

[0096]

[0097] wherein n represents the antenna element and uplink sequence number of the one-dimensional linear array, represents the complex digital baseband transmit signal of the nth uplink of the one-dimensional linear array, is the ith spatially separated complex digital baseband signal corresponding to the ith transmit pattern, k is an integer representing the discrete time variable, and θ i represents the angle between the main lobe of the ith transmit pattern and the normal line of the one-dimensional linear array, I represents the number of transmit patterns formed in parallel, I is at least 1, N represents the number of antenna elements of the one-dimensional linear array, d represents the distance between adjacent antenna elements of the one-dimensional linear array, and W i (n) represents the window function of the one-dimensional linear array corresponding to the ith transmit pattern, commonly used window functions include rectangular window function, Taylor window function, Chebyshev window function, and Hamming window function, f0 represents the carrier frequency of the analog radio frequency signal, c represents the speed of light, e represents the natural exponential symbol, j represents the imaginary unit, Δψ n and Δa n respectively represent the phase deviation value and the amplitude deviation percentage of the nth uplink of the one-dimensional linear array, Δψ n and Δa n are obtained during uplink calibration of the digital phased array; (Note: the phase deviation value and the amplitude deviation percentage of each uplink of the digital phased array must be calibrated and measured before the digital phased array is shipped)

[0098] the analog radio frequency signal is radiated by the nth antenna element through the nth uplink of the one-dimensional linear array;

[0099] If the antenna array of the digital phased array adopts a one-dimensional conformal array, a virtual one-dimensional linear array is constructed based on the one-dimensional conformal array, and the multi-channel parallel DBF transmit signal processing algorithm of the one-dimensional conformal array is as follows:

[0100]

[0101] wherein n represents the antenna element and uplink sequence number of the one-dimensional linear array, represents the complex digital baseband transmit signal of the nth uplink of the one-dimensional linear array, is the ith spatially separated complex digital baseband signal corresponding to the ith transmit pattern, θ i represents the angle between the main lobe of the ith transmit pattern and the normal line of the one-dimensional linear array, I represents the number of transmit patterns formed in parallel, I is at least 1, N represents the number of antenna elements of the one-dimensional linear array, d represents the distance between adjacent antenna elements of the one-dimensional linear array, Δd nirepresents the distance difference between the n-th antenna element of the one-dimensional conformal array and the n-th antenna element of the virtual one-dimensional linear array in the θ i direction, W i represents the distance difference between the n-th antenna element of the one-dimensional conformal array and the n-th antenna element of the virtual one-dimensional linear array in the θ n direction, W n and Δa n respectively represent the phase deviation value and the amplitude deviation percentage of the n-th uplink of the one-dimensional conformal array, Δψ n and Δa i are obtained in the uplink calibration of the digital phased array;

[0102] an analog radio frequency signal is radiated from the n-th antenna element through the n-th uplink of the one-dimensional conformal array to the space;

[0103] If the antenna array of the digital phased array adopts a two-dimensional planar array, referring to Figure 9 , the two-dimensional planar array is composed of M rows of one-dimensional linear arrays from the horizontal direction and N columns of one-dimensional linear arrays from the vertical direction, m represents the row number of the two-dimensional planar array, n represents the column number of the two-dimensional planar array, and the multi-path parallel DBF transmission signal processing algorithm of the two-dimensional planar array is as follows:

[0104]

[0105] wherein represents the complex digital baseband transmission signal of the uplink corresponding to the antenna element of the m-th row and the n-th column of the two-dimensional planar array, is the i-th space division complex digital baseband signal corresponding to the i-th transmission pattern, θ i and φ x respectively represent the elevation angle and the azimuth angle of the main lobe of the i-th transmission pattern relative to the two-dimensional planar array, I represents the number of the transmission patterns formed in parallel, I is at least 1, d y represents the distance between adjacent antenna elements of the vertical one-dimensional linear array, d i represents the distance between adjacent antenna elements of the horizontal one-dimensional linear array, W x (m) represents the window function of the vertical one-dimensional linear array corresponding to the i-th transmission pattern, W i y (n) represents the window function of the horizontal one-dimensional linear array corresponding to the i-th transmission pattern, Δψ mn and Δa mn respectively represent the phase deviation value and the amplitude deviation percentage of the uplink corresponding to the antenna element of the m-th row and the n-th column of the two-dimensional planar array, Δψ mn and Δa mn are obtained in the uplink calibration of the digital phased array;

[0106] the uplink corresponding to the antenna element in the mth row and the nth column of the two-dimensional planar array is radiated by the antenna element in the mth row and the nth column of the two-dimensional planar array;

[0107] If the antenna array of the digital phased array adopts a two-dimensional conformal array, a virtual two-dimensional planar array is constructed based on the two-dimensional conformal array, the virtual two-dimensional planar array is composed of M rows of virtual one-dimensional linear arrays from the lateral direction and N columns of virtual one-dimensional linear arrays from the longitudinal direction, m represents the row number of the two-dimensional conformal array and the virtual two-dimensional planar array, and n represents the column number of the two-dimensional conformal array and the virtual two-dimensional planar array, and the multi-path parallel DBF signal processing algorithm of the two-dimensional conformal array is as follows:

[0108]

[0109] wherein represents the complex digital baseband transmit signal of the uplink corresponding to the antenna element in the mth row and the nth column of the two-dimensional conformal array, is the ith spatially separated complex digital baseband signal corresponding to the ith transmit pattern, θ i and φ i respectively represent the elevation angle and the azimuth angle of the main lobe of the ith transmit pattern relative to the virtual two-dimensional planar array, I represents the number of the multiple transmit patterns formed in parallel, the value of I is at least 1, d x represents the distance between adjacent antenna elements of the longitudinal virtual one-dimensional linear array, d y represents the distance between adjacent antenna elements of the lateral virtual one-dimensional linear array, Δd mni represents the distance difference between the antenna element in the mth row and the nth column of the two-dimensional conformal array and the antenna element in the mth row and the nth column of the virtual two-dimensional planar array in the direction with the elevation angle θ i and the azimuth angle φ i , W i x (m) represents the window function of the longitudinal virtual one-dimensional linear array corresponding to the ith transmit pattern, W i y (n) represents the window function of the lateral virtual one-dimensional linear array corresponding to the ith transmit pattern, Δψ mn and Δa mn respectively represent the phase deviation value and the amplitude deviation percentage of the uplink corresponding to the antenna element in the mth row and the nth column of the two-dimensional conformal array, Δψ mn and Δa mn are obtained during the uplink calibration of the digital phased array;

[0110] The uplink corresponding to the antenna unit in the mth row and nth column of the two-dimensional conformal array radiates an analog radio frequency signal into space from the antenna unit in the mth row and nth column.

[0111] If the digital phased array uses RF sampling digital phased array, refer to Figure 5 The signal processing method for each uplink of the RF sampling digital phased array is as follows: n represents the uplink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and the complex digital baseband transmission signal of the nth uplink is Calculated by formula (5) or formula (6) or formula (7) or formula (8), use A n (k) indicates The amplitude signal is express The phase signal is express The real part signal of express The imaginary signal of The analog baseband signal obtained by the first DAC is expressed as n (t) represents, then The analog baseband signal obtained by the second DAC is C n (t) represents, then in Representative A n (k) The corresponding analog signal, represent The corresponding analog signal, t represents the continuous time independent variable; in all complex digital baseband transmission signal converters, the first ADC and the second ADC use the same sampling time interval T s , T s The value must satisfy where f m represents the highest cutoff frequency of the analog RF signal; B n (t) The digital radio frequency signal obtained by the first ADC is used as D n (l) indicates that C n (t) The digital RF signal obtained by the second ADC is expressed as E n (l) indicates that Where l is an integer representing a discrete time independent variable; the same digital sine signal generator is used in all complex digital baseband transmission signal converters, and the digital sine signal generator generates two mutually orthogonal digital sine signals. Without loss of generality, one channel is O c (l) = cos(2πf0T s l) indicates that the other is represented by Os (l) = -sin(2pftT s l) represents; D n (l) and O c (l) after being multiplied by the first digital multiplier, and E n (l) and O s (l) after being multiplied by the second digital multiplier, and the digital radio frequency signal obtained by the digital adder is denoted by R n (l) represents, then R n (l) after being converted by the third DAC, is denoted by represents, then the analog radio frequency signal output by the nth complex digital baseband signal converter, the amplitude signal of the amplitude signal A n (k) corresponds to the analog signal the phase signal of the phase signal of the corresponding analog signal The analog radio frequency signal is radiated by the nth antenna unit to the space through a power amplifier and a duplexer.

[0112] If the digital phased array adopts an intermediate frequency sampling digital phased array, refer to Figure 6 The signal processing method of each uplink of the intermediate frequency sampling digital phased array is as follows: n represents the uplink and antenna unit sequence number of a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, and the complex digital baseband signal of the nth uplink is calculated by formula (5) or formula (6) or formula (7) or formula (8), and is denoted by A n (k) represents the amplitude signal of is denoted by the phase signal of is denoted by the real part signal of is denoted by the imaginary part signal of The analog baseband signal obtained by the first DAC is denoted by B n (t) represents, then The analog baseband signal obtained by the second DAC is denoted by C n (t) represents, then wherein represents A n (k) corresponds to the analog signal, represent corresponding analog signals, t represents continuous time independent variable; in all complex digital baseband transmitting signal converters, the same digital sinusoidal signal generator is adopted, which generates two mutually orthogonal digital sinusoidal signals, without loss of generality, one is represented by O c (l) = cos(2πf i T s l) and the other is represented by O s (l) = -sin(2πf i T s l), wherein f i represents the carrier frequency of the analog intermediate frequency signal, and l is an integer representing discrete time independent variable; in all complex digital baseband transmitting signal converters, the same sampling time interval T s is adopted by the first ADC and the second ADC, and the value of T s must satisfy wherein f m represents the highest cut-off frequency of the analog intermediate frequency signal; B n (t) obtained by the first ADC is represented by D n (l), then C n (t) obtained by the second ADC is represented by E n (l), then D n (l) and O c (l) are multiplied by the first digital multiplier to obtain an output signal, and E n (l) and O s (l) are multiplied by the second digital multiplier to obtain an output signal, and the digital intermediate frequency signal obtained by the digital adder is represented by I n (l), then I n (l) obtained by the third DAC is represented by , then in all complex digital baseband transmitting signal converters, the same analog sinusoidal wave generator is adopted, without loss of generality, the analog sinusoidal wave generated by the analog sinusoidal wave generator is represented by , wherein f1 represents the frequency of the analog sinusoidal wave; and are multiplied by the analog multiplier to obtain an output signal, which is represented by , then the analog radio frequency signal obtained by filtering out the low frequency signal in the analog BPF is represented by , then ​where f0=f1+f i is the carrier frequency of the analog radio frequency signal, is the analog radio frequency signal converted by the nth complex digital baseband transmitting signal converter, is the amplitude signal of is the amplitude signal A n (k) is the corresponding analog signal is the phase signal of is the phase signal of is the corresponding analog signal The analog radio frequency signal is radiated by the nth antenna unit to the space through a power amplifier and a duplexer.

[0113] If the digital phased array adopts a baseband sampling digital phased array, refer to Figure 7 The signal processing method of each uplink of the baseband sampling digital phased array is as follows: n represents the uplink and antenna unit serial number of a one-dimensional linear array or a one-dimensional conformal array or a two-dimensional planar array or a two-dimensional conformal array, the complex digital baseband transmitting signal of the nth uplink is calculated by formula (5) or formula (6) or formula (7) or formula (8), A n (k) represents the amplitude signal of represents the phase signal of represents the real part signal of represents the imaginary part signal of The analog baseband signal obtained through the first DAC is represented by B n (t), then The analog baseband signal obtained through the second DAC is represented by C n (t), then wherein represents A n (k) is the corresponding analog signal, represents is the corresponding analog signal, t represents the continuous time independent variable; the same first analog sine wave generator is used in all complex digital baseband transmitting signal converters, the analog sine wave generator generates two mutually orthogonal analog sine waves, without loss of generality, one is represented by O c (t)=cos(2πf i t), and the other is represented by O s (t)=-sin(2πf i t), wherein f if1 represents the frequency of the analog sinusoidal wave; B n (t) is multiplied by O c (t) is multiplied by C n (t) is multiplied by O s (t) is multiplied by O is obtained by an analog adder, wherein In all the complex digital baseband signal converters, a same second analog sinusoidal wave generator is used, which generates an analog sinusoidal wave denoted by , wherein f1 represents the frequency of the analog sinusoidal wave; is multiplied by is multiplied by is obtained, wherein The low frequency signal in the analog RF signal is filtered out by an analog BPF is obtained, wherein is obtained, wherein , wherein f0 = f1 + f i is the carrier frequency of the analog RF signal, is the analog RF signal output by the nth complex digital baseband signal converter, is the amplitude signal of is the amplitude signal of n (k) is the corresponding analog signal is the phase signal of is the phase signal of is the corresponding analog signal The analog RF signal is radiated to space by the nth antenna unit through a power amplifier and a duplexer.

[0114] The above embodiments specifically illustrate the content of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the concept of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A method for parallel reception of multi-channel space division signals based on digital phased array hardware, characterized in that: The digital phased array adopts a radio frequency sampling digital phased array, an intermediate frequency sampling digital phased array, or a baseband sampling digital phased array. Each antenna unit of the digital phased array is connected to a downlink and an uplink respectively through a duplexer. Each downlink includes a limiter, an LNA, and an analog radio frequency signal converter connected in sequence. The input end of the limiter is connected to the output end of the duplexer. Each uplink includes a complex digital baseband transmission signal converter and a power amplifier connected in sequence. The output end of the power amplifier is connected to the input end of the duplexer. The antenna array of the digital phased array adopts a one-dimensional linear array, a one-dimensional conformal array, a two-dimensional planar array, or a two-dimensional conformal array. The analog RF signal output by the LNA in each downlink of the digital phased array is converted into a complex digital baseband receive signal by an analog RF signal converter. The complex digital baseband receive signal output by each downlink is processed in parallel using a multi-path parallel DBF receive signal processing algorithm to calculate multiple spatially divided complex digital baseband signals from different directions. The details are as follows: When using a one-dimensional linear array, the multi-channel parallel DBF receiving signal processing algorithm is as follows: When a one-dimensional conformal array is used, a virtual one-dimensional linear array is constructed based on the one-dimensional conformal array. The multi-channel parallel DBF receiving signal processing algorithm of the one-dimensional conformal array is as follows: in is the i-th spatially divided complex digital baseband signal received by the i-th receiving pattern of the one-dimensional linear array or one-dimensional conformal array, n represents the antenna element and downlink sequence number of the one-dimensional linear array or one-dimensional conformal array, is the complex digital baseband received signal output by the nth downlink of a one-dimensional linear array or a one-dimensional conformal array, k represents the discrete time independent variable, θ i represents the angle between the main lobe of the i-th receiving pattern and the normal of the one-dimensional linear array or virtual one-dimensional linear array, N represents the number of antenna elements in the one-dimensional linear array or virtual one-dimensional linear array, d represents the spacing between adjacent antenna elements in the one-dimensional linear array or virtual one-dimensional linear array, and W i (n) represents the window function of the one-dimensional linear array or virtual one-dimensional linear array corresponding to the i-th receiving pattern, f0 represents the carrier frequency of the analog radio frequency signal, c represents the speed of light, e represents the natural exponential sign, j represents the imaginary unit, Δψ n and Δa n Represents the phase deviation value and amplitude deviation percentage of the nth downlink of a one-dimensional linear array or a one-dimensional conformal array, Δd ni Represents the nth antenna element of the one-dimensional conformal array and the nth antenna element of the virtual one-dimensional linear array at θ i Distance difference in direction; Use equation (1) or equation (2) to calculate the θ from I directions in parallel i ,i=1,2,…I multi-channel space division multiplexing digital baseband signal When a two-dimensional planar array is used, the two-dimensional planar array is composed of M rows of one-dimensional linear arrays when viewed horizontally and N columns of one-dimensional linear arrays when viewed vertically. m and n represent the row and column numbers of the two-dimensional planar array, respectively. The multi-channel parallel DBF receiving signal processing algorithm of the two-dimensional planar array is as follows: When a two-dimensional conformal array is used, a virtual two-dimensional planar array is constructed based on the two-dimensional conformal array. The virtual two-dimensional planar array is composed of M rows of virtual one-dimensional linear arrays when viewed horizontally, and N columns of virtual one-dimensional linear arrays when viewed vertically. m and n represent the row and column numbers of the two-dimensional conformal array and the virtual two-dimensional planar array, respectively. The multi-channel parallel DBF receiving signal processing algorithm for the two-dimensional conformal array is as follows: in is the i-th spatially divided complex digital baseband signal received by the i-th receiving pattern of the two-dimensional planar array or the two-dimensional conformal array, is the complex digital baseband received signal output by the downlink corresponding to the antenna unit in the mth row and nth column of the two-dimensional planar array or two-dimensional conformal array, θ i and φ i Represents the elevation angle and azimuth angle of the main lobe of the i-th receiving pattern relative to the two-dimensional plane array or the virtual two-dimensional plane array, d x and d y Respectively represent the spacing between adjacent antenna units in the longitudinal and transverse one-dimensional linear arrays or virtual one-dimensional linear arrays, and Respectively represent the window functions of the longitudinal and transverse one-dimensional linear arrays or virtual one-dimensional linear arrays corresponding to the i-th receiving pattern, Δψ mn and Δa mn They represent the phase deviation value and amplitude deviation percentage of the downlink corresponding to the antenna unit in the mth row and nth column of the two-dimensional planar array or the two-dimensional conformal array, Δd mni The antenna element in the mth row and nth column of the two-dimensional conformal array and the antenna element in the mth row and nth column of the virtual two-dimensional planar array are (θ i ,φ i ) direction; Use formula (3) or formula (4) to calculate the Multi-channel space division multiplexing digital baseband signal 2. The method for parallel reception of multi-channel space division signals based on digital phased array hardware according to claim 1, characterized in that: The digital phased array uses a radio frequency sampling digital phased array. The signal processing method for each downlink of the radio frequency sampling digital phased array is as follows: n represents the downlink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and represents the analog RF signal output by the LNA in the nth downlink, t represents a continuous time independent variable, cos(2πf0t) represents the carrier of the analog RF signal, and express The transmitted analog baseband modulated signal is All analog RF signal converters use the same sampling time interval T. s , T s The value must satisfy where f m represents the highest cutoff frequency of the analog radio frequency signal; The digital RF signal obtained by ADC is expressed as S n (l) indicates that Where l represents a discrete time independent variable; the same digital sinusoidal signal generator is used in all analog RF signal converters, and the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals, one of which is O c (l)=2cos(2πf0T s l) indicates that the other is represented by O s (l)=-2sin(2πf0T s l) indicates; S n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier is A n (l) indicates that A n (1) The output signal obtained by filtering out the high-frequency signal in the first FIRLPF is B n (l) indicates that S n (l) with O s (1) The output signal obtained after multiplication by the second digital multiplier is C n (l) indicates that C n (l) The output signal obtained by filtering out the high-frequency signal through the second FIR LPF is D n (l) indicates that In all analog RF signal converters, the first decimator and the second decimator use the same decimation interval; B n (1) The real digital baseband signal obtained by the first extractor is used Indicates that D n (1) The real digital baseband signal obtained by the second extractor is used Indicates that Where S is an integer representing the extraction interval of the extractor, and the value of S must satisfy The integer part of f b represents the highest cutoff frequency of the analog baseband modulation signal; and The complex digital baseband signal synthesizer obtains but The complex digital baseband received signal output by the nth downlink.

3. The multi-channel space division signal parallel receiving method based on digital phased array hardware according to claim 1, characterized in that: The digital phased array adopts the intermediate frequency sampling digital phased array. The signal processing method of each downlink of the intermediate frequency sampling digital phased array is as follows: n represents the downlink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array or two-dimensional conformal array, and represents the analog RF signal output by the LNA in the nth downlink, t represents a continuous time independent variable, cos(2πf0t) represents the carrier of the analog RF signal, and express The transmitted analog baseband modulated signal is The same analog sine wave generator is used in all analog RF signal converters. The analog sine wave generated by the analog sine wave generator is used to denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the analog multiplier is used express, The analog intermediate frequency signal obtained by filtering out the high frequency signal through the analog BPF is used Indicates that where f i =f0-f1 represents the carrier frequency of the analog intermediate frequency signal; ADC in all analog radio frequency signal converters uses the same sampling time interval T s , T s The value must satisfy where f m Represents the highest cutoff frequency of the analog intermediate frequency signal; The digital intermediate frequency signal obtained by ADC is n (l) indicates that Where l represents a discrete time independent variable; the same digital sinusoidal signal generator is used in all analog RF signal converters, and the digital sinusoidal signal generator generates two mutually orthogonal digital sinusoidal signals and one channel is O c (l)=2cos(2πf i T s l) indicates that the other is represented by O s (l)=-2sin(2πf i T s l) indicates; n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier is A n (l) indicates that A n (1) The output signal obtained by filtering out the high-frequency signal through the first FIR LPF is expressed as B n (l) indicates that I n (l) with O s (1) The output signal obtained after multiplication by the second digital multiplier is C n (l) indicates that C n (l) The output signal obtained by filtering out the high-frequency signal through the second FIR LPF is D n (l) indicates that In all analog RF signal converters, the first decimator and the second decimator use the same decimation interval; B n (1) The real digital baseband signal obtained by the first extractor is used Indicates that D n (1) The real digital baseband signal obtained by the second extractor is used Indicates that Where S is an integer representing the extraction interval of the extractor, and the value of S must satisfy The integer part of f b represents the highest cutoff frequency of the analog baseband modulation signal; and The complex digital baseband signal synthesizer obtains but The complex digital baseband received signal output by the nth downlink.

4. The method for parallel reception of multi-channel space division signals based on digital phased array hardware according to claim 1, characterized in that: The digital phased array uses a baseband sampling digital phased array. The signal processing method for each downlink of the baseband sampling digital phased array is as follows: n represents the downlink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and represents the analog RF signal output by the LNA in the nth downlink, t represents a continuous time independent variable, cos(2πf0t) represents the carrier of the analog RF signal, and express The transmitted analog baseband modulated signal is The same first analog sine wave generator is used in all analog RF signal converters. The analog sine wave generated by the analog sine wave generator is used to generate the analog sine wave. denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the third analog multiplier is used express, The analog intermediate frequency signal obtained by filtering out the high frequency signal through the analog BPF is used Indicates that where f i =f0-f1 represents the carrier frequency of the analog intermediate frequency signal; the same second analog sine wave generator is used in all analog radio frequency signal converters, and the analog sine wave generator generates two mutually orthogonal analog sine waves, one of which is O c (t)=2cos(2πf i t) indicates that the other way is represented by O s (t)=-2sin(2πf i t) indicates; With O c (t) The output signal obtained after multiplication by the first analog multiplier is A n (t) indicates that A n (t) The analog baseband signal obtained by filtering out the high-frequency signal through the first analog LPF is n (t) represents, then With O s (t) The output signal obtained after multiplication by the second analog multiplier is C n (t) indicates that C n (t) The analog baseband signal obtained by filtering out the high-frequency signal through the second analog LPF is D n (t) represents, then In all analog RF signal converters, the first ADC and the second ADC use the same sampling time interval T s , T s The value must satisfy f m represents the highest cutoff frequency of the analog baseband modulation signal; B n (t) The real digital baseband signal obtained by the first ADC is used Indicates that D n (t) The real digital baseband signal obtained by the second ADC is used Indicates that and The complex digital baseband signal synthesizer obtains but The complex digital baseband received signal output by the nth downlink.

5. A method for parallel transmission of multi-channel space division signals based on digital phased array hardware, characterized in that: The digital phased array adopts a radio frequency sampling digital phased array, an intermediate frequency sampling digital phased array, or a baseband sampling digital phased array. Each antenna unit of the digital phased array is connected to a downlink and an uplink respectively through a duplexer. Each downlink includes a limiter, an LNA, and an analog radio frequency signal converter connected in sequence. The input end of the limiter is connected to the output end of the duplexer. Each uplink includes a complex digital baseband transmission signal converter and a power amplifier connected in sequence. The output end of the power amplifier is connected to the input end of the duplexer. The antenna array of the digital phased array adopts a one-dimensional linear array, a one-dimensional conformal array, a two-dimensional planar array, or a two-dimensional conformal array. The multi-channel spatially divided complex digital baseband signals transmitted in different directions use a multi-channel parallel DBF transmission signal processing algorithm to calculate the complex digital baseband transmission signal of each uplink. After the uplink signal processing, each complex digital baseband transmission signal is radiated into space by the corresponding antenna unit to form multiple transmission direction patterns in the far field. The multi-channel spatially divided complex digital baseband signals are transmitted in parallel in different directions. The details are as follows: When using a one-dimensional linear array, the multi-channel parallel DBF transmission signal processing algorithm is as follows: When a one-dimensional conformal array is used, a virtual one-dimensional linear array is constructed based on the one-dimensional conformal array. The multi-channel parallel DBF transmission signal processing algorithm of the one-dimensional conformal array is as follows: Where n represents the antenna element and uplink number of a one-dimensional linear array or a one-dimensional conformal array, represents the complex digital baseband transmission signal of the nth uplink of a one-dimensional linear array or a one-dimensional conformal array, is the i-th spatially divided complex digital baseband signal corresponding to the i-th transmission pattern, k represents the discrete time independent variable, θ i represents the angle between the main lobe of the i-th transmission pattern and the normal of the one-dimensional linear array or virtual one-dimensional linear array, I represents the number of multiple transmission patterns formed in parallel, N represents the number of antenna elements of the one-dimensional linear array or virtual one-dimensional linear array, d represents the spacing between adjacent antenna elements of the one-dimensional linear array or virtual one-dimensional linear array, and W i (n) represents the window function of the one-dimensional linear array or virtual one-dimensional linear array corresponding to the i-th transmission pattern, f0 represents the carrier frequency of the analog radio frequency signal, c represents the speed of light, e represents the natural exponential sign, j represents the imaginary unit, Δψ n and Δa n Represents the phase deviation value and amplitude deviation percentage of the nth uplink of a one-dimensional linear array or a one-dimensional conformal array, Δd ni Represents the nth antenna element of the one-dimensional conformal array and the nth antenna element of the virtual one-dimensional linear array at θ i Distance difference in direction; The analog radio frequency signal is radiated into space by the nth antenna element through the nth uplink of the one-dimensional linear array or the one-dimensional conformal array; When a two-dimensional planar array is used, the two-dimensional planar array is composed of M rows of one-dimensional linear arrays when viewed horizontally and N columns of one-dimensional linear arrays when viewed vertically. m and n represent the row and column numbers of the two-dimensional planar array, respectively. The multi-channel parallel DBF transmission signal processing algorithm of the two-dimensional planar array is as follows: When a two-dimensional conformal array is used, a virtual two-dimensional planar array is constructed based on the two-dimensional conformal array. The virtual two-dimensional planar array is composed of M rows of virtual one-dimensional linear arrays when viewed horizontally, and N columns of virtual one-dimensional linear arrays when viewed vertically. m and n represent the row and column numbers of the two-dimensional conformal array and the virtual two-dimensional planar array, respectively. The multi-channel parallel DBF transmission signal processing algorithm of the two-dimensional conformal array is as follows: in represents the complex digital baseband transmission signal of the uplink corresponding to the antenna element in the mth row and nth column of the two-dimensional planar array or two-dimensional conformal array, is the i-th spatially divided complex digital baseband signal corresponding to the i-th transmission pattern, θ i and φ i They represent the elevation angle and azimuth angle of the main lobe of the i-th emission pattern relative to the two-dimensional plane array or the virtual two-dimensional plane array, I represents the number of multiple emission patterns formed in parallel, and d x and d y Respectively represent the spacing between adjacent antenna units in the longitudinal and transverse one-dimensional linear arrays or virtual one-dimensional linear arrays, and Respectively represent the window functions of the longitudinal and transverse one-dimensional linear arrays or virtual one-dimensional linear arrays corresponding to the i-th receiving pattern, Δψ mn and Δa mn They represent the phase deviation value and amplitude deviation percentage of the uplink corresponding to the antenna unit in the mth row and nth column of the two-dimensional planar array or the two-dimensional conformal array, Δd mni The antenna element in the mth row and nth column of the two-dimensional conformal array and the antenna element in the mth row and nth column of the virtual two-dimensional planar array are at an elevation angle of θ. i , azimuth is φ i Distance difference in direction; The uplink corresponding to the antenna unit in the mth row and nth column of the two-dimensional planar array or the two-dimensional conformal array radiates the analog radio frequency signal into space from the antenna unit in the mth row and nth column.

6. The method for parallel transmission of multi-channel space division signals based on digital phased array hardware according to claim 5, characterized in that: The digital phased array uses a radio frequency sampling digital phased array. The signal processing method for each uplink of the radio frequency sampling digital phased array is as follows: n represents the uplink and antenna unit number of the one-dimensional linear array, one-dimensional conformal array, two-dimensional planar array, or two-dimensional conformal array, and the complex digital baseband transmission signal of the nth uplink is Calculated by formula (5) or formula (6) or formula (7) or formula (8), use A n (k) indicates The amplitude signal is express The phase signal is express The real part signal of express The imaginary signal of The analog baseband signal obtained by the first DAC is expressed as n (t) represents, then The analog baseband signal obtained by the second DAC is C n (t) represents, then in Representative A n (k) The corresponding analog signal, represent The corresponding analog signal, t represents the continuous time independent variable; in all complex digital baseband transmission signal converters, the first ADC and the second ADC use the same sampling time interval T s , T s The value must satisfy where f m represents the highest cutoff frequency of the analog RF signal; B n (t) The digital radio frequency signal obtained by the first ADC is D n (l) indicates that C n (t) The digital RF signal obtained by the second ADC is E n (l) indicates that Where l represents a discrete time independent variable; the same digital sine signal generator is used in all complex digital baseband transmission signal converters, and the digital sine signal generator generates two mutually orthogonal digital sine signals, one of which is O c (l) = cos(2πf0T s l) indicates that the other is represented by O s (l)=-sin(2πf0T s l) indicates; D n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier and E n (l) with O s (1) The output signal obtained by multiplying by the second digital multiplier is added to the digital RF signal obtained by the digital adder. n (l) indicates that R n (1) The analog RF signal obtained by the third DAC is used Indicates that The analog RF signal output by the nth complex-to-digital baseband transmit signal converter; The analog radio frequency signal is radiated into space by the nth antenna unit through the power amplifier and the duplexer.

7. The method for parallel transmission of multi-channel space division signals based on digital phased array hardware according to claim 5, characterized in that: The digital phased array adopts the intermediate frequency sampling digital phased array. The signal processing method of each uplink of the intermediate frequency sampling digital phased array is as follows: n represents the uplink and antenna unit number of the one-dimensional linear array or one-dimensional conformal array or two-dimensional planar array or two-dimensional conformal array, and the complex digital baseband transmission signal of the nth uplink is Calculated by formula (5) or formula (6) or formula (7) or formula (8), use A n (k) indicates The amplitude signal is express The phase signal is express The real part signal of express The imaginary signal of The analog baseband signal obtained by the first DAC is expressed as n (t) represents, then The analog baseband signal obtained by the second DAC is C n (t) represents, then in Representative A n (k) The corresponding analog signal, represent The corresponding analog signal, t represents a continuous time independent variable; the same digital sine signal generator is used in all complex digital baseband transmission signal converters, and the digital sine signal generator generates two mutually orthogonal digital sine signals, one of which is O c (l) = cos(2πf i T s l) indicates that the other is represented by O s (l)=-sin(2πf i T s l) represents, where f i represents the carrier frequency of the analog intermediate frequency signal, l represents the discrete time independent variable; in all complex digital baseband transmission signal converters, the first ADC and the second ADC use the same sampling time interval T s , T s The value must satisfy where f m represents the highest cutoff frequency of the analog intermediate frequency signal; B n (t) The digital intermediate frequency signal obtained by the first ADC is D n (l) indicates that C n (t) The digital intermediate frequency signal obtained by the second ADC is E n (l) indicates that D n (l) with O c (1) The output signal obtained after multiplication by the first digital multiplier and E n (l) with O s (1) The output signal obtained by multiplying by the second digital multiplier is added to the digital intermediate frequency signal obtained by the digital adder. n (l) indicates that I n (1) The analog intermediate frequency signal obtained by the third DAC is used Indicates that The same analog sine wave generator is used in all complex digital baseband transmission signal converters. The analog sine wave generated by the analog sine wave generator is used to denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the analog multiplier is used express, The analog RF signal obtained by filtering out the low-frequency signal through the analog BPF is used Indicates that where f0=f1+f i is the carrier frequency of the analog RF signal, The analog RF signal output by the nth complex-to-digital baseband transmit signal converter; The analog radio frequency signal is radiated into space by the nth antenna unit through the power amplifier and the duplexer.

8. The method for parallel transmission of multi-channel space division signals based on digital phased array hardware according to claim 5, characterized in that: The digital phased array uses a baseband sampling digital phased array. The signal processing method for each uplink of the baseband sampling digital phased array is as follows: n represents the uplink and antenna unit number of the one-dimensional linear array or one-dimensional conformal array or two-dimensional planar array or two-dimensional conformal array, and the complex digital baseband transmission signal of the nth uplink is Calculated by formula (5) or formula (6) or formula (7) or formula (8), use A n (k) indicates The amplitude signal is express The phase signal is express The real part signal of express The imaginary signal of The analog baseband signal obtained by the first DAC is expressed as n (t) represents, then The analog baseband signal obtained by the second DAC is C n (t) represents, then in Representative A n (k) The corresponding analog signal, represent The corresponding analog signal, t represents a continuous time independent variable; the same first analog sine wave generator is used in all complex digital baseband transmission signal converters, and the analog sine wave generator generates two mutually orthogonal analog sine waves, one of which is O c (t) = cos(2πf i t) indicates that the other way is represented by O s (t)=-sin(2πf i t) represents, where f i represents the frequency of the simulated sine wave; B n (t) and O c (t) The output signal obtained after multiplication by the first analog multiplier is equal to C n (t) and O s (t) The output signal obtained by multiplying by the second analog multiplier is used to obtain the analog intermediate frequency signal obtained by the analog adder. Indicates that The same second analog sine wave generator is used in all complex digital baseband transmission signal converters. The analog sine wave generated by the analog sine wave generator is used to generate the analog sine wave. denoted by, wherein f1 represents the frequency of the simulated sine wave; and The output signal obtained after multiplication by the third analog multiplier is used express, The analog RF signal obtained by filtering out the low-frequency signal through the analog BPF is used Indicates that where f0=f1+f i is the carrier frequency of the analog radio frequency signal, The analog RF signal output by the nth complex-to-digital baseband transmit signal converter; The analog radio frequency signal is radiated into space by the nth antenna unit through the power amplifier and the duplexer.

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