Multi-channel radio frequency signal phase difference control system and method

Abstract

The invention provides a multi-channel radio frequency signal phase difference control system and method, and the system comprises a plurality of radio frequency signal generation circuits which are used for generating a reference radio frequency signal and a plurality of radio frequency signals to be subjected to phase modulation, and a radio frequency phase discrimination link comprises a radio frequency gating switch and a first mixer, the radio frequency gating switch is used for selecting one path of radio frequency signal to be subjected to phase modulation and inputting the radio frequency signal to the first mixer, the first mixer is used for mixing a reference radio frequency signal and the selected radio frequency signal to be subjected to phase modulation and outputting a mixed radio frequency signal to the phase difference adjusting circuit, and the low-pass filter is used for filtering the mixed radio frequency signal and outputting a filtered signal to the analog-to-digital converter; the analog-to-digital converter is used for converting the filtering signal into a digital signal and outputting the digital signal to the control unit, and the control unit is used for performing phase adjustment on the radio frequency signal generation circuit based on the digital signal so as to adjust the phase difference between the reference radio frequency signal and the radio frequency signal to be subjected to phase modulation; the circuit reduces the number of high-cost components, simplifies circuit debugging, is flexible in control, and is suitable for various temperature environments.

Description

Technical Field

[0001] The present application relates to the technical field of radio frequency signal processing, and in particular to a multi-channel radio frequency signal phase difference control system and method. Background Art

[0002] The RF signal is obtained by mixing, which is widely used in wireless communication, multiple-input multiple-output radar (MIMOR) and phased array radar (PAR). Among them, the coherence of multi-channel signals is an important technical indicator that affects the performance of radar systems. In actual engineering applications, the signal transmission path, external environment temperature changes, and individual differences of different connected RF circuits will affect the phase of the RF signal.

[0003] In the related technology, the circuits and methods for designing compensation for phase shifting hardware such as delay lines, RC networks, voltage control, and waveguide mechanical phase shifting require professional device manufacturers, and have the problems of high threshold, small controllable and adjustable range, narrow frequency band, dispersion, large error and poor accuracy, and are not suitable for broadband frequency hopping sources. In addition, it is difficult to compensate for phase difference drift when the ambient temperature changes. Summary of the invention

[0004] The present invention provides a multi-channel radio frequency signal phase difference control system and method to solve the technical problems of complex coherence adjustment of the multi-channel radio frequency signal, and limited adjustment effect and application environment.

[0005] In one embodiment of the present application, the present application provides a multi-channel RF signal phase difference control system, including: an RF phase-detection link, a phase difference adjustment circuit, a control unit, and an RF signal generating circuit; the number of the RF signal generating circuits is multiple, so as to generate a reference RF signal and multiple RF signals to be phase-adjusted; the RF phase-detection link includes an RF gating switch and a first mixer, the RF gating switch is used to select a RF signal to be phase-adjusted and input it to the first mixer, the first mixer is used to mix the reference RF signal and the selected RF signal to be phase-adjusted, and output the mixed RF signal to the phase difference adjustment circuit; the phase difference adjustment circuit includes a low-pass filter and an analog-to-digital converter, the low-pass filter is used to filter the mixed RF signal and output the filtered signal to the analog-to-digital converter, the analog-to-digital converter is used to convert the filtered signal into a digital signal and output it to the control unit; the control unit is used to perform phase adjustment on the RF signal generating circuit based on the digital signal to adjust the phase difference between the reference RF signal and the RF signal to be phase-adjusted.

[0006] In one embodiment of the present application, the RF phase-detection link further includes a first RF amplifier, a second RF amplifier and a plurality of resistors, and the phase difference adjustment circuit further includes an operational amplifier; the reference RF signal is weakly coupled to the second RF amplifier through a resistor, the RF gating switch includes a plurality of input terminals, and each RF signal to be phase-adjusted is weakly coupled to a corresponding input terminal of the RF gating switch through a resistor; the input terminal of the first RF amplifier is connected to the output terminal of the RF gating switch, the output terminal of the first RF amplifier is connected to the first input terminal of the first mixer, and the output terminal of the second RF amplifier is connected to the second input terminal of the first mixer; the output terminal of the first mixer is connected to the input terminal of the low-pass filter, the output terminal of the low-pass filter is connected to the input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is connected to the input terminal of the control unit; the output terminal of the control unit is respectively connected to each intermediate frequency signal generating unit for generating the RF signal to be phase-adjusted.

[0007] In one embodiment of the present application, the multi-channel RF signal phase difference control system further includes at least one of the following:

[0008] The low-pass filter is used to filter out the RF components after mixing; the RF gating switch includes an absorptive RF switch; the RF amplifier includes a broadband RF amplifier; the first mixer includes a high-level double-balanced mixer; the operational amplifier includes a rail-to-rail single-power operational amplifier; the conversion bit number of the analog-to-digital converter includes more than ten bits.

[0009] In one embodiment of the present application, the RF signal generating circuit includes a local oscillator signal generating unit, an intermediate frequency signal generating unit, a second mixer, and a filter amplifier circuit; the first input end of the second mixer is connected to the output end of the local oscillator signal generating unit, the second input end of the second mixer is connected to the output end of the intermediate frequency signal generating unit, the output end of the second mixer is connected to the input end of the filter amplifier circuit, and the reference RF signal or the RF signal to be phase-adjusted is output through the filter amplifier circuit.

[0010] In one embodiment of the present application, the multi-channel RF signal phase difference control system also includes a reference frequency generating unit; the reference frequency generating unit includes a reference frequency generating unit, a power divider, a frequency generation module, a two-frequency divider, a first filtering and amplifying power dividing unit, and a second filtering and amplifying power dividing unit; the reference frequency generating unit is connected to the input end of the power divider, the first output end of the power divider is connected to the input end of the frequency generation module, the second output end of the power divider is connected to the input end of the two-frequency divider, and the first output end of the frequency generation module is connected to the input end of the first filtering and amplifying power dividing unit. The second output end of the frequency production module is connected to the control unit, and the input end of the second filtering and amplifying power division unit is connected to the output end of the binary divider; the first filtering and amplifying power division unit includes multiple power division output ends to output multiple intermediate frequency reference clock signals, and a power division output end of the first filtering and amplifying power division unit is connected to the input end of the intermediate frequency signal generating unit; the second filtering and amplifying power division unit includes multiple power division output ends to output multiple local oscillator reference clock signals, and a power division output end of the second filtering and amplifying power division unit is connected to the input end of the local oscillator signal generating unit.

[0011] In one embodiment of the present application, the present application provides a multi-channel RF signal phase difference control method, including: obtaining a mixing output voltage, wherein the mixing output voltage is obtained by mixing and filtering a parent RF signal and a replica RF signal, wherein the replica RF signal is selected from a plurality of RF signals to be phase-adjusted through an RF gating circuit, and wherein the parent RF signal is obtained based on a reference RF signal; adjusting the pre-mixing phase difference between the parent RF signal and the replica RF signal, and determining the quadrant in which the pre-mixing phase difference is located according to a change trend of the mixing output voltage; performing an initial adjustment on the current phase of the replica RF signal according to the adjusted mixing output voltage and the quadrant in which the pre-mixing phase difference is located, so that the parent RF signal and the replica RF signal are in phase before mixing; measuring a phase difference inserted by a phase detector before mixing, and performing phase difference compensation on the current phase after the initial adjustment according to the phase difference inserted by the phase detector, so that the reference RF signal and the RF signal to be phase-adjusted corresponding to the replica RF signal are in phase.

[0012] In one embodiment of the present application, the pre-mixing phase difference between the parent RF signal and the replica RF signal is adjusted, and the quadrant in which the pre-mixing phase difference is located is determined according to the change trend of the mixing output voltage, including: the mixing output voltage is obtained based on filtering out the RF component after mixing through a low-pass filter; increasing or decreasing the initial phase of the replica RF signal to obtain the adjusted mixing output voltage; and determining the quadrant in which the pre-mixing phase difference is located based on the increase or decrease adjustment direction of the initial phase and the increase or decrease change direction between the mixing output voltage and the adjusted mixing output voltage.

[0013] In one embodiment of the present application, the current phase of the replica RF signal is initially adjusted according to the adjusted mixer output voltage and the quadrant where the pre-mixing phase difference is located, including: determining the pre-mixing phase difference value according to the adjusted mixer output voltage and the quadrant where the pre-mixing phase difference is located; adjusting the intermediate frequency phase of the intermediate frequency signal based on the pre-mixing phase difference value; wherein the intermediate frequency signal is used to generate the replica RF signal.

[0014] In one embodiment of the present application, a phase difference of a phase-locked insertion before mixing is measured, and a phase difference compensation is performed on the current phase after initial adjustment according to the phase-locked insertion phase difference, including: measuring the phase-locked insertion phase difference at the RF signal output end through an oscilloscope, and the RF signal output end is used to characterize the output end of the RF signal to be phase-adjusted and the reference RF signal; and subtracting the phase-locked insertion phase difference from the intermediate frequency phase after initial adjustment to perform phase difference compensation.

[0015] In one embodiment of the present application, after the reference RF signal and the RF signal to be phase-adjusted corresponding to the replica RF signal are made in phase; the pre-mixing phase difference value, the current phase after initial adjustment, and the phase difference compensation value corresponding to each RF signal to be phase-adjusted are converted into a phase control word for storage, and a phase control mapping relationship is obtained, so that each RF signal to be phase-adjusted is in phase with the reference RF signal, and the phase difference compensation value is obtained based on the phase difference inserted by the phase detection; and / or, the RF signal parameters are adjusted based on the acquired channel adjustment requirements, and the channel adjustment requirements include at least one of the independent frequency hopping requirements of multi-channel RF signals and the same-frequency coherent frequency hopping requirements of multi-channel RF signals.

[0016] Beneficial effects of the embodiments of the present invention: The present invention provides a multi-channel RF signal phase difference control system and method. The embodiments of the present invention perform phase detection through an RF selection switch and a first mixer, and adjust the phase difference between a reference RF signal and the RF signal to be phase-adjusted through a low-pass filter and an analog-to-digital converter, thereby effectively reducing the number of high-cost components, simplifying circuit debugging, and lowering the threshold for realizing arbitrary expansion of multi-channel products. The control is flexible, and the phase difference adjustment can be started at any time under different temperature environmental conditions, thereby achieving the purpose of calibrating the phase difference index and stabilizing the output.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 A schematic diagram showing an exemplary system architecture to which the technical solution of the embodiments of the present application can be applied;

[0020] Figure 2 A schematic diagram of a process of controlling a multi-channel radio frequency signal phase difference according to an embodiment of the present application is shown;

[0021] Figure 3 A waveform simulation diagram of the startup delay difference of multiple DDS and frequency dividers according to an embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram showing a quadrant determination principle according to an embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram of an oscilloscope phase difference test according to an embodiment of the present application is shown;

[0024] Figure 6 A schematic diagram of implementing a multi-channel radio frequency signal phase difference control method according to an embodiment of the present application is shown;

[0025] Figure 7 A schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0028] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0029] See also Figure 1 , Figure 1 A schematic diagram of an exemplary system architecture to which the technical solution of the embodiment of the present application can be applied is shown. Figure 1 As shown, the system architecture may include a radio frequency phase detection link, a phase difference adjustment circuit, a control unit, and a radio frequency signal generating circuit; the number of the radio frequency signal generating circuits is multiple to generate a reference radio frequency signal f RF1 and multiple RF signals to be phase modulated f RF2～n The RF phase-detection link includes an RF selection switch Z1 and a first mixer U1. The RF selection switch Z1 is used to select a RF signal to be phase-modulated and input it to the first mixer U1. The first mixer U1 is used to mix a reference RF signal and the selected RF signal to be phase-modulated, and output the mixed RF signal to the phase difference adjustment circuit. The phase difference adjustment circuit includes a low-pass filter Z2 and an analog-to-digital converter D1. The low-pass filter Z2 is used to filter the mixed RF signal and output the filtered signal to the analog-to-digital converter D1. The analog-to-digital converter is used to convert the filtered signal into a digital signal and output it to the control unit. The control unit is used to perform phase adjustment on the RF signal generation circuit based on the digital signal to adjust the phase difference between the reference RF signal and the RF signal to be phase-modulated.

[0030] In one embodiment of the present application, the reference radio frequency signal f RF1 and multiple RF signals to be phase modulated f RF2～n The multi-channel RF output signal f RF1～n .

[0031] In one embodiment of the present application, the RF gating switch Z1 includes a RF N-to-1 switch, wherein N is the number of RF channels, and M N / M-to-1 switches are connected in parallel or combined to reduce the width for easy expansion.

[0032] In one embodiment of the present application, the control unit is composed of components such as a memory, a field-programmable gate array (FPGA) circuit, and a single-chip microcomputer.

[0033] In one embodiment of the present application, the analog-to-digital converter (ADC) D1 selects an analog-to-digital converter with more than 10 bits.

[0034] In one embodiment of the present application, the RF phase-detection link also includes a first RF amplifier, a second RF amplifier and multiple resistors, and the phase difference adjustment circuit also includes an operational amplifier; the reference RF signal is weakly coupled to the second RF amplifier through a resistor, the RF gating switch includes multiple input terminals, and each RF signal to be phase-adjusted is weakly coupled to a corresponding input terminal in the RF gating switch through a resistor; the input terminal of the first RF amplifier is connected to the output terminal of the RF gating switch, the output terminal of the first RF amplifier is connected to the first input terminal of the first mixer, and the output terminal of the second RF amplifier is connected to the second input terminal of the first mixer; the output terminal of the first mixer is connected to the input terminal of the low-pass filter, the output terminal of the low-pass filter is connected to the input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is connected to the input terminal of the control unit; the output terminal of the control unit is respectively connected to each intermediate frequency signal generating unit for generating the RF signal to be phase-adjusted.

[0035] In one embodiment of the present application, please continue to refer to Figure 1 ,like Figure 1 As shown, the RF phase detection link also includes a first RF amplifier N1, a second RF amplifier N2 and a plurality of resistors R1-n, and the phase difference adjustment circuit also includes an operational amplifier N3. The RF output signal f from the second to the nth channel RF2～n Through resistors R2~Rn, they are weakly coupled to the RF N-to-1 switch Z1; the RF output signal f of the first channel RF1 It is weakly coupled to the first mixer U1 through the resistor R1.

[0036] In one embodiment of the present application, please continue to refer to Figure 1 ,like Figure 1 As shown, each coupled RF signal obtained by weak coupling through resistors R2 to Rn is connected to a RF N-to-1 switch Z1. Z1 is controlled by the control unit to only turn on the RF output signal f RF2～n Any one of the paths is amplified by the first RF amplifier N1 to obtain a replica RF signal, which is then output to the first mixer U1; the coupled RF signal obtained by weak coupling through the resistor R1 is amplified by the second RF amplifier N2 to obtain a parent RF signal, which is then output to the first mixer U1. The first mixer U1 performs phase discrimination on the parent RF signal and the replica RF signal to obtain a phase discrimination voltage V F1 , that is, the mixed RF signal, and output it to the low-pass filter Z2, the low-pass filter Z2 filters the phase-discrimination voltage signal to obtain a filtered signal, and outputs it to the operational amplifier N3, which amplifies the filtered signal and outputs the amplified voltage V F2 , and then output to the analog-to-digital converter D1 for sampling. The analog-to-digital converter converts the amplified voltage in the analog signal format into a digital signal and outputs it to the control unit.

[0037] In one embodiment of the present application, the control unit identifies the input digital signal and outputs a control signal to control the phase of the RF N-to-1 switch Z1 and the corresponding intermediate frequency signal in the intermediate frequency signal generating unit.

[0038] In one embodiment of the present application, the multi-channel RF signal phase difference control system also includes at least one of the following: a low-pass filter is used to filter out the RF component after mixing; the RF selection switch includes an absorptive RF switch; the RF amplifier includes a broadband RF amplifier; the first mixer includes a high-level double-balanced mixer; the operational amplifier includes a rail-to-rail single-power supply operational amplifier; the conversion bit number of the analog-to-digital converter includes more than ten bits.

[0039] In one embodiment of the present application, the low-pass filter Z2 selects a cutoff frequency that can filter out the RF output signal f RF1～n and harmonic low pass filters.

[0040] In one embodiment of the present application, the RF signal generating circuit includes a local oscillator signal generating unit, an intermediate frequency signal generating unit, a second mixer, and a filter amplifier circuit; the first input end of the second mixer is connected to the output end of the local oscillator signal generating unit, the second input end of the second mixer is connected to the output end of the intermediate frequency signal generating unit, the output end of the second mixer is connected to the input end of the filter amplifier circuit, and the reference RF signal or the RF signal to be phase-adjusted is output through the filter amplifier circuit.

[0041] In one embodiment of the present application, please continue to refer to Figure 1 ,like Figure 1 As shown, for example, to generate the first channel f RF1 The RF signal generating circuit includes a first second mixer U21, a local oscillator signal generating unit 1, an intermediate frequency signal generating unit 1, and a filter amplifier circuit; generating the nth channel f RFn The radio frequency signal generating circuit includes an nth second mixer U2n, a local oscillator signal generating unit n, an intermediate frequency signal generating unit n, and a filtering and amplifying circuit.

[0042] In one embodiment of the present application, the radio frequency signal generating circuit includes a local oscillator signal generating unit, an intermediate frequency signal generating unit and a radio frequency signal generating unit, wherein the radio frequency signal generating unit includes a second mixer and a filter amplifier circuit.

[0043] In one embodiment of the present application, multiple local oscillator signals (f LO ) The generating unit outputs n local oscillator signals f under the control of the control unit. LO1～n , and are respectively input into the corresponding RF signal generating units to generate corresponding RF output signals.

[0044] In one embodiment of the present application, the circuit structure of each local oscillator signal generating unit is the same, and the circuit structure of the local oscillator signal generating unit includes an integer-frequency phase-locked loop and its peripheral circuits, wherein its bandwidth can be expanded by using a large-bandwidth voltage-controlled oscillator (Voltage-Controlled Oscillator, VCO) and a divider.

[0045] In one embodiment of the present application, a plurality of intermediate frequency signals (f IF ) The generating unit outputs n intermediate frequency signals f under the control of the control unit. IF1～n , and are respectively input into the corresponding RF signal generating unit sequence to generate the corresponding RF output signal.

[0046] In one embodiment of the present application, the circuit structure of each intermediate frequency signal generating unit is the same, and the circuit structure of the intermediate frequency signal generating unit includes a direct digital synthesizer (Direct Digital Synthesizer, DDS) and its peripheral circuits.

[0047] In one embodiment of the present application, a plurality of radio frequency signals (f RF , m = p*q frequency hopping points) generates a unit sequence through mixers U21~U2n, and the input large-step local oscillator signal (f LO , P points) and small step intermediate frequency signal (f IF , q points) for mixing and then directly output after filtering and amplification.

[0048] In one embodiment of the present application, the control unit can also control each local oscillator signal f in each local oscillator signal generating unit according to an external input control signal. LO1～n The synchronous frequency hopping, and each intermediate frequency signal f in each intermediate frequency signal generating unit IF1～n frequency and phase.

[0049] In one embodiment of the present application, the multi-channel RF signal phase difference control system also includes a reference frequency generating unit; the reference frequency generating unit includes a reference frequency generating unit, a power divider, a frequency production module, a divider, a first filter amplifier power divider unit, and a second filter amplifier power divider unit; the reference frequency generating unit is connected to the input end of the power divider, the first output end of the power divider is connected to the input end of the frequency production module, the second output end of the power divider is connected to the input end of the divider, the first output end of the frequency production module is connected to the input end of the first filter amplifier power divider unit, the second output end of the frequency production module is connected to the control unit, and the input end of the second filter amplifier power divider unit is connected to the output end of the divider; the first filter amplifier power divider unit includes a plurality of power divider output ends to output a plurality of intermediate frequency reference clock signals, and a power divider output end of the first filter amplifier power divider unit is connected to the input end of the intermediate frequency signal generating unit; the second filter amplifier power divider unit includes a plurality of power divider output ends to output a plurality of local oscillator reference clock signals, and a power divider output end of the second filter amplifier power divider unit is connected to the input end of the local oscillator signal generating unit.

[0050] In one embodiment of the present application, please continue to refer to Figure 1 ,like Figure 1 As shown, the reference frequency generating unit outputs a 120MHZ basic reference signal in a multi-channel RF signal phase difference control system through a 120MHz oven controlled crystal oscillator (OCXO); the basic reference signal is split into two paths by a power divider, one path is input into a frequency production module to generate a frequency signal for outputting an intermediate frequency reference clock signal, such as a 1GHz frequency signal, and the other path is used as a control unit reference frequency signal, such as a 40MHz frequency signal. After filtering, amplifying and power-dividing into n paths by a first filtering and amplifying power dividing unit, the 1GHz frequency signal is output to each intermediate frequency signal generating unit as an input clock signal of the intermediate frequency signal generating unit, and the 40MHz frequency signal is output as an input clock signal of the control unit; the other path of the power-divided basic reference signal is converted after frequency division by 2 to obtain a frequency signal for outputting a local oscillator reference clock signal, such as a 60MHz frequency signal. After filtering, amplifying and power-dividing into n paths based on the second filtering and amplifying power dividing unit, the 60MHz frequency signal is output to each local oscillator signal generating unit as an input frequency signal of the local oscillator signal generating unit.

[0051] See also Figure 2 , Figure 2 FIG. 2 is a flow chart showing a method for controlling phase difference of a multi-channel radio frequency signal according to an embodiment of the present application. Figure 2 As shown, in an exemplary embodiment, the multi-channel RF signal phase difference control method includes at least steps S210 to S240, which are described in detail as follows:

[0052] Step S210, obtaining the mixing output voltage.

[0053] The mixing output voltage is obtained by mixing and filtering a parent RF signal and a replica RF signal, the replica RF signal is selected from multiple RF signals to be phase-modulated by a RF gating circuit, and the parent RF signal is obtained based on a reference RF signal.

[0054] In one embodiment of the present application, the mixing output voltage is used to represent the voltage after filtering, amplification, and analog-to-digital conversion in sequence after mixing.

[0055] In one embodiment of the present application, the RF output signal f RF1～n is the intermediate frequency signal f IF1～n and the local oscillator signal f LO1～n The frequency is generated by mixing multiple second mixers U21~U2n, f RFn =f LOn ±f IFn , only the single sideband is filtered.

[0056] In one embodiment of the present application, the mixing equation between the local oscillator signal and the intermediate frequency signal is as follows:

[0057]

[0058] Among them, V R (t) is the value of the voltage output by the second mixer changing with time t, A1 is the amplitude of the sum frequency component, ω L is the angular frequency of the local oscillator signal, ω I is the angular frequency of the intermediate frequency signal, is the local oscillator phase of the local oscillator signal, is the intermediate frequency phase of the intermediate frequency signal, and A2 is the amplitude of the difference frequency component.

[0059] In one embodiment of the present application, as shown in formula (1), it can be seen that the phase difference of the mixing output is linearly related to the phase difference of the mixing input, so the intermediate frequency signal f of each channel is adjusted IF1～n The initial phase Theoretically, the RF output signal f of each channel can be realized RF1～n Low phase difference Because the phase indicators of various components in each channel intermediate frequency signal generating unit and each channel local oscillator signal generating unit have a fluctuation range, the RF output signal f of each channel is generated. IF1～n The transmission paths of the channels are different, and the time shift of the signals in each channel is different. Therefore, the RF output signal f RF1～n When the same frequency is output, the initial phase is different, and the time shift between channels causes a large difference in phase shift.

[0060] In one embodiment of the present application, please continue to refer to Figure 1 ,like Figure 1 As shown, at the RF signal output end, the phase difference between the two RF output signals is as follows:

[0061]

[0062] in, is the phase difference between the two RF output signals at the RF signal output end, Δθ 插入 is the phase insertion difference of the RF phase detection link, Δθ PD is the phase difference at the entrance of the first mixer, that is, the phase difference before RF mixing.

[0063] In one embodiment of the present application, the present application converts the first RF output signal f RF1 As the reference signal for phase difference detection, the second RF output signal f RF2 To the nth RF output signal f RFn The first RF output signal f RF1 Phase shifting is performed for the reference, which is only an example, and the present application does not impose any limitation on the actual number of paths of the reference RF signal.

[0064] In one embodiment of the present application, the present application is based on the first RF output signal f RF1 Get the mother RF signal, the second RF output signal f RF2 The phase difference control is explained by taking the replica RF signal as an example.

[0065] In one embodiment of the present application, all intermediate frequency signals f RF1～n The default frequency initial phase is 0° when the power is turned on, which is convenient for phase shifting. Figure 3 , Figure 3 FIG. 1 shows a waveform simulation diagram of the startup delay difference of multiple DDS and frequency dividers according to an embodiment of the present application. Figure 3 As shown in the figure, it is found that there are differences in the Δt value of the random startup delay between the DDS or dividers of multiple channels. The reasons for the random delay difference include at least one of the following: channel signal clock difference, instruction arrival time difference at the DDS, instruction arrival time difference at the divider, and switching comparison action blind spot; the random delay difference causes the output of the RF output signal between the channels to be different. The phase is random at each power-on. It is impossible to set the initial phase to 0° and read it only through an oscilloscope. To make corrections, a radio frequency phase detection link must be inserted, such as Figure 1 shown.

[0066] In one embodiment of the present application, the RF N-to-one switch Z1 is turned on, and the second RF output signal f is amplified by the first RF amplifier N1. RF2, obtain a replica RF signal and input it to the first mixer U1. The first RF output signal f RF1 The mother radio frequency signal is amplified by the second radio frequency amplifier N2 to obtain the mother radio frequency signal, and is input to the first mixer U1.

[0067] In one embodiment of the present application, the amplitudes of the replica RF signal and the primary RF signal are equal.

[0068] In one embodiment of the present application, the first mixer U1 performs phase detection on the input primary RF signal and the replica RF signal, and outputs a phase detection voltage V F1 as follows:

[0069]

[0070] Among them, V F1 is the phase-comparison voltage, K1 is the low-frequency component amplitude, is the initial phase of the mother RF signal, is the initial phase of the replica RF signal, K2 is the amplitude of the second harmonic component, ω is the angular frequency, and t is the time.

[0071] In one embodiment of the present application, the phase-comparison voltage V is filtered out by a low-pass filter Z2. F1 The RF component in the circuit is amplified and the amplified voltage is obtained as follows:

[0072]

[0073] Among them, V F2 is the amplified voltage, K is the amplitude of the amplified voltage, is the initial phase of the mother RF signal, is the initial phase of the replica RF signal.

[0074] Step S220, adjusting the pre-mixing phase difference between the parent RF signal and the replica RF signal, and determining the quadrant where the pre-mixing phase difference is located according to the variation trend of the mixer output voltage.

[0075] In one embodiment of the present application, the pre-mixing phase difference between the parent RF signal and the replica RF signal is adjusted, and the quadrant in which the pre-mixing phase difference is located is determined based on the change trend of the mixing output voltage, including: the mixing output voltage is obtained based on the RF component after mixing filtered out by a low-pass filter; the initial phase of the replica RF signal is increased or decreased to obtain the adjusted mixing output voltage; the quadrant in which the pre-mixing phase difference is located is determined based on the increase or decrease adjustment direction of the initial phase, and the increase or decrease change direction between the mixing output voltage and the adjusted mixing output voltage.

[0076] In one embodiment of the present application, as shown in formula (4), the amplified voltage V F2is a cosine curve. When the phase difference is -180°~0, f(θ) has a monotonically increasing characteristic, that is, k1=f'(θ)≥0. When the phase difference is θ before the positive modulation mixing, the amplified voltage increases.

[0077] In one embodiment of the present application, see Figure 4 , Figure 4 FIG. 2 is a schematic diagram showing a quadrant determination principle according to an embodiment of the present application. Figure 4 As shown, by following the above-mentioned increase and decrease rule of the amplified voltage, the phase difference before mixing is slightly increased, that is, the initial phase of the replica RF signal is slightly reduced. To observe the amplified voltage V F2 The increase or decrease of can determine the quadrant where the phase difference before mixing is located. Since the voltage value after filtering is mV level, it is amplified to V level by operational amplifier N3, that is, V F2 It is V level.

[0078] In one embodiment of the present application, an analog-to-digital converter D1 is used to convert the amplified voltage in analog signal format into a digital signal and input it into a control unit, so that the control unit can determine the pre-mixing phase difference and the pre-mixing phase difference value according to the input digital signal.

[0079] Step S230 , preliminarily adjusting the current phase of the replica RF signal according to the adjusted mixer output voltage and the quadrant where the phase difference before mixing is located, so that the parent RF signal and the replica RF signal are in phase before mixing.

[0080] In one embodiment of the present application, the current phase of the replica RF signal is initially adjusted according to the quadrant in which the adjusted mixer output voltage and the pre-mixing phase difference are located, including: determining the pre-mixing phase difference value according to the quadrant in which the adjusted mixer output voltage and the pre-mixing phase difference are located; adjusting the intermediate frequency phase of the intermediate frequency signal based on the pre-mixing phase difference value; wherein the intermediate frequency signal is used to generate the replica RF signal.

[0081] In one embodiment of the present application, as shown in formula (2), it can be known that This application first lets Δθ PD = 0°, forcing Based on Δθ 插入 Perform phase compensation to make

[0082] In one embodiment of the present application, the control unit outputs a phase control instruction to control the intermediate frequency signal f output by the intermediate frequency signal generating unit. IF2 , so that Δθ PD →0°. Phase difference before mixing ΔθPD as follows:

[0083] Δθ PD =(θ Lo1 -θ Lo2 )+(θ IF1 -θ IF2 )=Δθ Lo1-2 -Δθ IF1-2 Formula (5)

[0084] Among them, Δθ PD is the phase difference before mixing, θ Lo1 is the local oscillator phase corresponding to the mother RF signal, θ Lo2 is the local oscillator phase corresponding to the replica RF signal, θ IF1 is the intermediate frequency phase corresponding to the mother RF signal, θ IF2 is the intermediate frequency phase corresponding to the replica RF signal, Δθ Lo1-2 is the local oscillator phase difference, Δθ IF1-2 is the intermediate frequency phase difference.

[0085] In one embodiment of the present application, the fixed phase difference is omitted in equation (5), and the local oscillator phase difference Δθ Lo1-2 Not numerically controlled and fixed, only the intermediate frequency phase difference is Δθ IF1-2 It can be digitally controlled. By adjusting the intermediate frequency phase of the intermediate frequency signal, the second RF output signal f can be adjusted. RF2 The purpose of the phase is to fix the phase difference between the mother RF signal and the replica RF signal at the entry point of the first mixer U1 to a preset phase difference accuracy value, so that Δθ PD →0° is to ensure that the parent RF signal and the replica RF signal are in phase before mixing.

[0086] Step S240, measuring the phase difference of the phase detection insertion before mixing, and performing phase difference compensation on the current phase after the initial adjustment according to the phase detection insertion phase difference, so that the reference RF signal and the RF signal to be phase-adjusted corresponding to the replica RF signal are in phase.

[0087] In one embodiment of the present application, a phase difference of a phase-locked insertion before mixing is measured, and a phase difference compensation is performed on the current phase after initial adjustment according to the phase-locked insertion phase difference, including: measuring the phase-locked insertion phase difference at the RF signal output end through an oscilloscope, the RF signal output end is used to characterize the output end of the RF signal to be phase-adjusted and the reference RF signal; and performing phase difference compensation by subtracting the phase-locked insertion phase difference from the intermediate frequency phase after initial adjustment.

[0088] In one embodiment of the present application, the phase difference inserted by the phase detection is used to characterize the phase difference introduced by the radio frequency phase detection link.

[0089] In one embodiment of the present application, the RF signal output terminal is measured by an oscilloscope. 插入 , and finally add -Δθ插入 , that is, to achieve purpose.

[0090] In one embodiment of the present application, the first RF output signal f RF1 And the second RF output signal f RF2 After being adjusted to the same phase, the first RF output signal f RF1 and the third to nth RF output signals f RF3～n Adjust to the same phase.

[0091] In one embodiment of the present application, the first RF output signal f RF1 And the second RF output signal f RF2 After the phase difference at the entrance of the first mixer U1 is adjusted to be in phase, the second RF output signal f RF2 Phase control step, switch the RF N-to-one switch Z1 to the third RF output signal f RF3 , the third RF output signal f is obtained through the first mixer U1 RF3 and the first RF output signal f RF1 Repeat the above control process to adjust the third intermediate frequency signal f IF3 The intermediate frequency phase is realized by analogy in all channels. RF1～n The phase difference at the entrance of the first mixer U1 is adjusted to the specified value Δθ PD .

[0092] In one embodiment of the present application, see Figure 5 , Figure 5 FIG. 2 shows a schematic diagram of an oscilloscope phase difference test according to an embodiment of the present application. Figure 5 As shown, after semi-fixing the corresponding phase difference adjustment state of all channels before the entrance of the first mixer U1, the RF signal output end is passed through an oscilloscope, and the phase difference measurement accuracy is improved by the waveform number num≥10, and Δθ is measured one by one 插入1-n Matrix [n∈N, n≥2, m*(n-1) collection points], and record them, then add "-Δθ" one by one 插入1-n "Matrix correction value, finally reaching the RF output signal f of all channels RF1～n Low phase difference And the purpose of comparison.

[0093] In one embodiment of the present application, after the reference RF signal and the RF signal to be phase-adjusted corresponding to the replica RF signal are made in phase; the pre-mixing phase difference value, the current phase after initial adjustment, and the phase difference compensation value corresponding to each RF signal to be phase-adjusted are converted into a phase control word for storage, and a phase control mapping relationship is obtained, so that each RF signal to be phase-adjusted and the reference RF signal are in phase, and the phase difference compensation value is obtained based on the phase difference inserted by phase detection; and / or, the RF signal parameters are adjusted based on the acquired channel adjustment requirements, and the channel adjustment requirements include at least one of the independent frequency hopping requirements of multi-channel RF signals and the same-frequency coherent frequency hopping requirements of multi-channel RF signals.

[0094] In one embodiment of the present application, in order to achieve rapid adjustment of the intermediate frequency signal f of each channel IF2～n The intermediate frequency phase can be used to establish the digital signal output by the analog-to-digital converter D1 and the intermediate frequency signal f IF2～n The control unit can directly output the specified phase control code to the intermediate frequency signal generating unit of each channel according to the digital signal input by the control unit through the phase control mapping relationship stored inside the controller, so as to achieve fast control and adjustment of the intermediate frequency signal f of each channel. IF2～n The purpose of the intermediate frequency phase. The phase control mapping relationship is as follows:

[0095] Table 1 Phase control mapping relationship

[0096] Serial number Phase difference angle ADC Output Control unit phase control word 1 151.0 EF DB 0EFH,0EDH,82H,2DH,82H 2 150.0 EE DB 0EEH,0ECH,0CCH,2CH,0CCH ... ... ... ...

[0097] Among them, the phase difference angle is used to characterize the phase difference before mixing, the ADC output is used to characterize the mixing output voltage corresponding to the phase difference before mixing, and the control unit phase control word is the phase control information directly output by the converted control unit to directly control the intermediate frequency phase of the intermediate frequency signal to the specified phase value.

[0098] In one embodiment of the present application, the ADC outputs an 8-bit digital signal. Take "DB 0EFH, 0EDH, 82H, 2DH, 82H" in Table 1 as an example, where "DB" represents data, "OEFH" represents a 151-degree phase difference, and "0EDH, 82H, 2DH, 82H" are two phase control words output to the DDS chip, which are used to configure the 16-bit phase offset word (Phase Offset Word, POW) inside the DDS chip, so as to control the intermediate frequency signal output by the specified intermediate frequency signal generating unit DDS chip, and then control the RF output signal f of the specified channel. RF The difference between the two phase offset words "0EDH, 82H" and "2DH, 82H" in this example is 270 degrees. The purpose is to adjust the RF output signal f RFn调节 To the RF output signal f RF1In-phase state. If the phase difference between the nth replica RF signal and the parent RF signal is 151 degrees, the DDS chip output signal phase needs to be directly adjusted to 334 degrees, so that the phase difference between the nth replica RF signal and the parent RF signal is 270 degrees, then the phase offset = 334÷360×2 16 ≈60802, 60802 converted to hexadecimal is "0EDH,82H", the second time the phase needs to be shifted by 64 degrees, so that the RF output signal f corresponding to the nth replica RF signal RFn The RF output signal f corresponding to the mother RF signal RF1 In phase, then the phase offset = 64÷360×2 16 ≈11650, 11650 converted to hexadecimal is "2DH,82H". After sending the corresponding phase control word information to the specified intermediate frequency signal generating unit, the corresponding channel f can be directly controlled. IF to the specified phase value.

[0099] In one embodiment of the present application, the present application can also implement a priority control communication protocol instruction set for timely independent frequency hopping and frequency coherent hopping of each channel, and solidify it in the control program.

[0100] In one embodiment of the present application, see Figure 6 , Figure 6 FIG. 2 shows a schematic diagram of an implementation of a multi-channel RF signal phase difference control method according to an embodiment of the present application. Figure 6 As shown, the local oscillator signal and the intermediate frequency signal are initialized: multiple RF output signals are generated based on the generated local oscillator signal and the intermediate frequency signal mixing; the RF N-choose-one switch is switched to output the ith RF output signal f RFi :Through the RF N-to-one switch, the ith RF output signal f RFi Transmitted to the first mixer, the i-th replica RF signal is obtained; the phase-lock voltage V is obtained F1 :Mix the i-th replica RF signal with the parent RF signal to obtain the phase-locked voltage V F1 ; Filter out the phase-comparison voltage V F1 The RF components in the circuit are filtered out by a low-pass filter. F1 The RF component in the filter is amplified to obtain the amplified voltage V F2 :The amplitude of the filtered voltage is amplified to V level through the operational amplifier; the amplified voltage V F2 Convert to digital signal: Convert the amplified voltage to digital signal through analog-to-digital converter, which is the mixed output voltage; adjust the intermediate frequency signal f IFi Phase to specified value: adjust the IF signal f of the ith channel corresponding to the ith channel replica RF signal based on the mixer output voltage IFi Phase; whether the intermediate frequency signal f is adjustedIF2 ~f IFn :Adjust the intermediate frequency phase of the intermediate frequency signal corresponding to each replica RF signal in turn until the adjustment is completed; measure "Δθ 插入1-n "Matrix: Use an oscilloscope to measure the phase difference of the phase detection insertion at the RF signal output end, and obtain the phase difference of the phase detection insertion corresponding to each copy of the RF signal; add "-Δθ 插入1-n "Correction matrix: subtract the phase difference of the phase detection insertion corresponding to the replica RF signal from the IF phase after the initial adjustment to eliminate the influence of the phase introduced by the RF phase detection link; whether the IF signal f is corrected IF2 ~f IFn :Perform phase compensation on the initially modulated intermediate frequency signal corresponding to each replica RF signal in turn until the correction is completed. This application satisfies the requirement of realizing the RF output signal f of all channels. RF1 ~f RFn Under the premise of phase difference index, the number of high-cost components in hardware design is effectively reduced, the circuit debugging and quadrant determination are simplified, and the threshold for arbitrary expansion of multi-channel products is lowered. In addition, the control is flexible and the phase adjustment command function can be started at any time under different temperature conditions to achieve the purpose of phase difference index calibration and stable output.

[0101] In the case where the phase parameters of the hardware loops between channels are different, the present application simplifies the quadrant determination and debugging method, has an expandable frequency band, is dispersion-free, and can calibrate and control the phase of multi-channel mixing signals in real time at all temperatures, and can adjust the phase difference accuracy of the RF signal to be infinitely close to 0°.

[0102] The present application is based on a double-balanced mixer and an analog-to-digital converter, and is combined with a microwave circuit design method and process, and has the advantages of flexible phase control, high phase difference adjustment accuracy, and low threshold. In the related art, the circuit and method of ensuring the coherence of multi-channel mixing signals through hardware design compensation have the disadvantages of high threshold and small controllable and adjustable range. The present application uses a double-balanced mixer to phase-detect the mixing signals of multiple channels one by one. The phase detection voltage and the cosine phase difference have the characteristics of a linear correlation zone. Through digital control, the quadrant judgment and adjustment of the phase of the multi-channel mixing signal can be realized, and the phase difference can be controlled in real time, which reduces the phase shift hardware circuit design and hardware debugging threshold. The developed product can adjust the phase difference accuracy up to 3°. The phase difference accuracy of less than 3° can be achieved by increasing the number of bits of resolution of the analog-to-digital converter and phase shifting to offset the residual phase difference of the mixing phase detection. The full-temperature phase difference index has high consistency and strong functional expansibility, and can realize the output of any coherent frequency hopping mixing signal.

[0103] An embodiment of the present application also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device implements the multi-channel RF signal phase difference control method provided in the above-mentioned embodiments.

[0104] See also Figure 7 , Figure 7 The structure diagram of the computer system suitable for implementing the electronic device of the embodiment of the present application is shown. It should be noted that: Figure 7 The computer system 700 of the electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0105] like Figure 7 As shown, the computer system 700 includes a central processing unit (CPU) 701, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 702 or the program loaded from the storage part 708 to the random access memory (RAM) 703, such as executing the method described in the above embodiment. In the RAM 703, various programs and data required for system operation are also stored. The CPU 701, ROM 702 and RAM 703 are connected to each other through a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0106] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, a mouse, etc.; an output section 707 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 710 as needed so that a computer program read therefrom is installed into the storage section 708 as needed.

[0107] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 709, and / or installed from a removable medium 711. When the computer program is executed by a central processing unit (CPU) 701, various functions defined in the system of the present application are executed.

[0108] It should be noted that the computer-readable medium shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, wherein a computer-readable computer program is carried. This propagated data signal can take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. A computer program contained on a computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0109] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0110] The units involved in the embodiments described in the present application can be implemented by software or by hardware, and the units described can also be set in a processor. Among them, the names of these units do not constitute a limitation on the units themselves under certain circumstances. Therefore, the technical solution according to the implementation mode of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including a number of instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation mode of the present application.

[0111] Another aspect of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor of a computer, enables the computer to execute the multi-channel RF signal phase difference control method provided in the above-mentioned embodiments. The computer-readable storage medium may be included in the electronic device described in the above-mentioned embodiments, or may exist independently without being assembled into the electronic device.

[0112] In the above embodiments, unless otherwise specified, by using serial numbers such as "first" and "second" to describe common objects, it only means that they refer to different instances of the same object, rather than indicating that the objects being described must adopt a given order, whether in time, space, sorting or any other way.

[0113] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A multi-channel radio frequency signal phase difference control system, characterized in that: The system comprises: a radio frequency phase detection link, a phase difference adjustment circuit, a control unit, and a radio frequency signal generation circuit; The number of the radio frequency signal generating circuits is multiple, so as to generate one reference radio frequency signal and multiple radio frequency signals to be phase-modulated; The RF phase detection link comprises a RF gating switch and a first mixer, wherein the RF gating switch is used to select a RF signal to be phase-adjusted and input it to the first mixer, and the first mixer is used to mix the reference RF signal and the selected RF signal to be phase-adjusted and output the mixed RF signal to the phase difference adjustment circuit; The phase difference adjustment circuit includes a low-pass filter and an analog-to-digital converter, wherein the low-pass filter is used to filter the mixed radio frequency signal and output the filtered signal to the analog-to-digital converter, and the analog-to-digital converter is used to convert the filtered signal into a digital signal and output it to the control unit; The control unit is used to perform phase adjustment on the radio frequency signal generating circuit based on the digital signal to adjust the phase difference between the reference radio frequency signal and the radio frequency signal to be phase adjusted.

2. The multi-channel radio frequency signal phase difference control system according to claim 1, characterized in that: The radio frequency phase detection link further includes a first radio frequency amplifier, a second radio frequency amplifier and a plurality of resistors, and the phase difference adjustment circuit further includes an operational amplifier; The reference RF signal is weakly coupled to the second RF amplifier through a resistor, the RF gating switch includes a plurality of input terminals, and each RF signal to be phase-modulated is weakly coupled to a corresponding input terminal of the RF gating switch through a resistor; The input end of the first RF amplifier is connected to the output end of the RF gating switch, the output end of the first RF amplifier is connected to the first input end of the first mixer, and the output end of the second RF amplifier is connected to the second input end of the first mixer; The output end of the first mixer is connected to the input end of the low-pass filter, the output end of the low-pass filter is connected to the input end of the operational amplifier, the output end of the operational amplifier is connected to the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is connected to the input end of the control unit; The output end of the control unit is respectively connected to each intermediate frequency signal generating unit for generating the radio frequency signal to be phase modulated.

3. The multi-channel radio frequency signal phase difference control system according to claim 2, characterized in that: The multi-channel radio frequency signal phase difference control system further includes at least one of the following: The low-pass filter is used to filter out the radio frequency components after mixing; The radio frequency gating switch comprises an absorptive radio frequency switch; The radio frequency amplifier comprises a broadband radio frequency amplifier; The first mixer comprises a high level double balanced mixer; The operational amplifier comprises a rail-to-rail single-power supply operational amplifier; The conversion bit number of the analog-to-digital converter includes more than ten bits.

4. The multi-channel radio frequency signal phase difference control system according to any one of claims 1 to 3, characterized in that: The radio frequency signal generating circuit comprises a local oscillator signal generating unit, an intermediate frequency signal generating unit, a second mixer, and a filter amplifier circuit; The first input end of the second mixer is connected to the output end of the local oscillator signal generating unit, the second input end of the second mixer is connected to the output end of the intermediate frequency signal generating unit, the output end of the second mixer is connected to the input end of the filter amplifier circuit, and the reference RF signal or the RF signal to be phase-modulated is output through the filter amplifier circuit.

5. The multi-channel radio frequency signal phase difference control system according to claim 4, characterized in that: The multi-channel radio frequency signal phase difference control system further includes a reference frequency generating unit; The reference frequency generating unit includes a reference frequency generating unit, a power divider, a frequency generating module, a two-frequency divider, a first filtering and amplifying power dividing unit, and a second filtering and amplifying power dividing unit; The reference frequency generating unit is connected to the input end of the power divider, the first output end of the power divider is connected to the input end of the frequency generation module, the second output end of the power divider is connected to the input end of the two-frequency divider, the first output end of the frequency generation module is connected to the input end of the first filtering and amplifying power division unit, the second output end of the frequency generation module is connected to the control unit, and the input end of the second filtering and amplifying power division unit is connected to the output end of the two-frequency divider; The first filtering and amplifying power division unit includes a plurality of power division output terminals to output a plurality of intermediate frequency reference clock signals, and a power division output terminal of the first filtering and amplifying power division unit is connected to an input terminal of the intermediate frequency signal generating unit; The second filtering and amplifying power division unit includes a plurality of power division output terminals to output a plurality of local oscillator reference clock signals. A power division output terminal of the second filtering and amplifying power division unit is connected to an input terminal of the local oscillator signal generating unit.

6. A multi-channel radio frequency signal phase difference control method, characterized in that: The method comprises: Acquire a mixing output voltage, wherein the mixing output voltage is obtained by mixing and filtering a parent radio frequency signal and a replica radio frequency signal, wherein the replica radio frequency signal is selected from a plurality of radio frequency signals to be phase-modulated by a radio frequency gating circuit, and wherein the parent radio frequency signal is obtained based on a reference radio frequency signal; Adjusting the pre-mixing phase difference between the parent RF signal and the replica RF signal, and determining the quadrant where the pre-mixing phase difference is located according to a variation trend of the mixing output voltage; Preliminarily adjusting the current phase of the replica RF signal according to the adjusted mixer output voltage and the quadrant where the phase difference before mixing is located, so that the parent RF signal and the replica RF signal are in phase before mixing; The phase difference of the phase detection insertion before the mixing is measured, and the phase difference compensation is performed on the current phase after the initial adjustment according to the phase detection insertion phase difference, so that the reference radio frequency signal and the radio frequency signal to be phase-adjusted corresponding to the replica radio frequency signal are in phase.

7. The multi-channel RF signal phase difference control method according to claim 6, characterized in that: Adjusting the pre-mixing phase difference between the parent radio frequency signal and the replica radio frequency signal, and determining the quadrant where the pre-mixing phase difference is located according to the change trend of the mixer output voltage, including: The mixing output voltage is obtained based on filtering out the radio frequency component after mixing through a low-pass filter; Increasing or decreasing the initial phase of the replica RF signal to obtain an adjusted mixing output voltage; The quadrant where the pre-mixing phase difference is located is determined based on the increase / decrease adjustment direction of the initial phase and the increase / decrease change direction between the mixing output voltage and the adjusted mixing output voltage.

8. The multi-channel RF signal phase difference control method according to claim 6, characterized in that: Preliminarily adjusting the current phase of the replica RF signal according to the adjusted mixer output voltage and the quadrant where the pre-mixing phase difference is located, including: Determine the pre-mixing phase difference value according to the adjusted mixing output voltage and the quadrant where the pre-mixing phase difference is located; Adjusting the intermediate frequency phase of the intermediate frequency signal based on the pre-mixing phase difference value; The intermediate frequency signal is used to generate the replica radio frequency signal.

9. The multi-channel RF signal phase difference control method according to claim 8, characterized in that: The method measures the phase difference of the phase detection insertion before the frequency mixing, and performs phase difference compensation on the current phase after the initial adjustment according to the phase detection insertion phase difference, including: Measuring the phase difference of phase detection insertion at the output end of the radio frequency signal by an oscilloscope, wherein the output end of the radio frequency signal is used to characterize the output end of the radio frequency signal to be phase modulated and the reference radio frequency signal; The phase difference compensation is performed by subtracting the phase detection insertion phase difference from the intermediate frequency phase after the initial adjustment.

10. The multi-channel radio frequency signal phase difference control method according to any one of claims 6 to 9, characterized in that: After making the reference radio frequency signal and the radio frequency signal to be phase-adjusted corresponding to the replica radio frequency signal in phase; The phase difference value before mixing, the current phase after initial adjustment, and the phase difference compensation value corresponding to each radio frequency signal to be phase-adjusted are converted into a phase control word for storage, and a phase control mapping relationship is obtained so that each radio frequency signal to be phase-adjusted is in phase with the reference radio frequency signal, and the phase difference compensation value is obtained based on the phase difference inserted by the phase detection; And / or, adjusting radio frequency signal parameters based on the acquired channel adjustment requirements, wherein the channel adjustment requirements include at least one of independent frequency hopping requirements of multi-channel radio frequency signals and coherent frequency hopping requirements of multi-channel radio frequency signals.

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