Broadband digital array interference system emission correction method and device

Abstract

The invention discloses a broadband digital array interference system emission correction method and device, and the method comprises a time delay correction process, and the time delay correction process comprises the steps: a correction source generates N paths of correction dot frequency signals with completely consistent time delay and initial phases at the same time, and the frequency change of each path of correction dot frequency signal is f1-f3 in sequence; each path of correction dot frequency signal is amplified by a transmitting channel and coupled by a coupler and then is sent to a correction selection switch; the correction selection switch gates the N paths of coupling signals one by one and sends the signals to the correction receiver; the correction receiver outputs correction sample signals of N transmitting channels; the signal processing module is used for processing N paths of 3N correction sample signals by adopting a three-frequency-point correction method to obtain a time delay compensation table of all transmitting channels; the method has the advantages of simple correction process and low time cost.

Description

Technical Field

[0001] The present invention relates to the technical field of digital array jamming, and in particular to a transmission correction method and device for a broadband digital array jamming system. Background Art

[0002] Array jamming systems typically have a large number of transmit channels. Measuring and compensating for delay, amplitude, and phase in these channels is essential for achieving optimal performance. Calibration methods based on serial coupling networks are well established in array systems. However, serial coupling networks inherently exhibit inconsistencies in delay, amplitude, and phase. System calibration requires pre-measurement and compensation of these differences, which is complex to implement and can introduce errors in delay, amplitude, and phase measurements.

[0003] Chinese patent publication number CN112290982A discloses a calibration method for a phased array antenna serial feed calibration coupling network. The method uses a serial feed network composed of N couplers corresponding to antenna array elements and a beamforming network connected to the TR components of the corresponding couplers to form a bidirectional transmission serial feed network. The head and tail couplers and the beamforming network lead out consistent coupling ports A, B, and D as calibration channels. The switch and the calibration channel at the B end of the beamforming network are connected to the calibration extension. Then, the amplitude and phase of the signals of each channel of the A, B, and D ports are collected and detected by switching. The channel amplitude and phase calibration is performed on each branch separately. The calibration is performed by two test results of the bidirectional transmission of the signal in the calibration coupling channel, and the calibration results are integrated to reduce the amplitude and phase fluctuations of the coupling calibration channel with temperature, making the calibration result more accurate. However, the patent application also needs to detect the amplitude and phase of the signals of each channel before performing amplitude and phase correction. The process is relatively complicated and time-consuming. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the correction method for the array interference system in the prior art is complicated and time-consuming.

[0005] The present invention solves the above-mentioned technical problems through the following technical means: a transmission correction method for a broadband digital array interference system includes a time delay correction process, wherein the time delay correction process comprises: a correction source simultaneously generates N correction point frequency signals with completely consistent time delay and initial phase, and the frequency change of each correction point frequency signal is f1 to f3 in sequence; each correction point frequency signal is amplified by a transmission channel and coupled by a coupler and then sent to a correction selection switch; the correction selection switch selects the N coupled signals one by one and sends them to a correction receiver; the correction receiver outputs correction sample signals of N transmission channels; and a signal processing module processes the N correction sample signals, a total of 3N, using a three-frequency point correction method to obtain a time delay compensation table for all transmission channels.

[0006] Beneficial effect: The correction process of the present invention does not require delay detection of each channel signal. It only needs to input the correction point frequency signal with frequency changes of f1 to f3, and then use the three-frequency point correction method to process the correction sample signal output by the correction receiver to obtain the delay compensation table of all transmission channels, so that the correction process is simple and the time cost is low.

[0007] Furthermore, the three-frequency point correction method includes:

[0008] Each correction frequency signal meets are known integers, where Δf1=f2-f1, Δf2=f3-f1, To correct the phase difference between the two channels when the signal frequency difference is Δf1, To correct the phase difference between the two channels when the signal frequency difference is Δf2; According to this formula, the value of the weight coefficient M is calculated; the two-channel delay measurement result is Designate any one of all the transmission channels as the reference channel, calculate the sample delay of each transmission channel to form a delay compensation table to perform delay compensation on each transmission channel. The calculation formula for the number of delayed sample points is n=round(f s *τ), where f s is the AD sampling frequency, and τ is the two-channel delay measurement result, that is, the delay value of the current transmitting channel relative to the reference channel.

[0009] Furthermore, the method further includes an amplitude-phase correction process, which includes:

[0010] The number of frequency points m for correction is determined according to the operating frequency range of the system and the correction frequency interval; the correction source simultaneously generates N correction point frequency signals with completely consistent time delay and initial phase, and the frequency change of each correction point frequency signal is f1~f m ; N-channel correction point frequency signals complete delay compensation according to the delay compensation table, and the delay-compensated RF correction signals are sent to N transmission channels after DAC conversion. After being amplified by the N transmission channels and coupled by the coupler, they are sent to the correction selection switch; the correction selection switch selects the N-channel coupled signals one by one and sends them to the correction receiver; the correction receiver outputs the correction sample signals of the N transmission channels; the signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction tables of all transmission channels.

[0011] Furthermore, the signal processing module processes the N correction sample signals to obtain amplitude and phase correction tables for all transmit channels, including:

[0012] According to the collected correction sample signal, the amplitude and phase compensation coefficients of N transmission channels are calculated respectively to form an amplitude and phase correction table. The calculation formula of the amplitude and phase compensation coefficient is: x iis the calibration sample signal collected by the i-th transmission channel, x1 is the calibration sample signal of the reference channel, and the reference channel is any one of all the transmission channels.

[0013] Furthermore, when working in the transmitting state, the signal processing module performs digital delay, amplitude and phase weighted processing on the baseband digital interference signal according to the time delay compensation table and the amplitude and phase correction table, and then converts the processed baseband digital interference signal into a radio frequency interference signal through the D / A conversion of the correction source, and forms an interference beam pointing to the target airspace after passing through the transmitting channel and the transmitting antenna array.

[0014] The present invention also provides a device for the above-mentioned broadband digital array interference system transmission correction method, including N correction sources, N transmission channels, a correction selection switch, a correction receiver and a signal processing module. The N correction sources are respectively connected to the N transmission channels, and the output ends of the N transmission channels are respectively connected to the N antenna array elements of the transmitting antenna array. The N transmission channels are also respectively connected to the correction selection switch through a coupler, and the correction selection switch is connected to the signal processing module through the correction receiver.

[0015] The present invention also provides another broadband digital array jamming system emission correction method, including an amplitude and phase correction process, which includes:

[0016] The number of frequency points m for correction is determined according to the operating frequency range of the system and the correction frequency interval; the correction source simultaneously generates N correction point frequency signals with completely consistent time delay and initial phase, and the frequency change of each correction point frequency signal is f1~f m ; N-channel correction point frequency signals complete delay compensation according to the delay compensation table, and the delay-compensated RF correction signals are sent to N transmission channels after DAC conversion. After being amplified by the N transmission channels and coupled by the coupler, they are sent to the correction selection switch; the correction selection switch selects the N-channel coupled signals one by one and sends them to the correction receiver; the correction receiver outputs the correction sample signals of the N transmission channels; the signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction tables of all transmission channels.

[0017] Beneficial effect: The correction process of the present invention does not require amplitude and phase detection of each channel signal, and only requires the input frequency to change in the order of f1~f m The correction point frequency signal is obtained, and then the correction sample signal output by the correction receiver is processed to obtain the amplitude and phase correction table of all transmission channels, and amplitude and phase correction is performed, so that the correction process is simple and the time cost is low.

[0018] Furthermore, the signal processing module processes the N correction sample signals to obtain amplitude and phase correction tables for all transmit channels, including:

[0019] According to the collected correction sample signal, the amplitude and phase compensation coefficients of N transmission channels are calculated respectively to form an amplitude and phase correction table. The calculation formula of the amplitude and phase compensation coefficient is: x i is the calibration sample signal collected by the i-th transmission channel, x1 is the calibration sample signal of the reference channel, and the reference channel is any one of all the transmission channels.

[0020] Furthermore, when working in the transmitting state, the signal processing module performs digital delay, amplitude and phase weighted processing on the baseband digital interference signal according to the time delay compensation table and the amplitude and phase correction table, and then converts the processed baseband digital interference signal into a radio frequency interference signal through the D / A conversion of the correction source, and forms an interference beam pointing to the target airspace after passing through the transmitting channel and the transmitting antenna array.

[0021] The present invention also provides a device for the above-mentioned broadband digital array interference system transmission correction method, including N correction sources, N transmission channels, a correction selection switch, a correction receiver and a signal processing module. The N correction sources are respectively connected to the N transmission channels, and the output ends of the N transmission channels are respectively connected to the N antenna array elements of the transmitting antenna array. The N transmission channels are also respectively connected to the correction selection switch through a coupler, and the correction selection switch is connected to the signal processing module through the correction receiver.

[0022] The advantages of the present invention are:

[0023] (1) The present invention adopts a transmission correction design scheme based on a correction selection switch. Compared with the serial coupling network correction scheme, it eliminates the test steps and measurement errors of the coupling network delay and amplitude and phase inconsistency. The scheme process is relatively simple and the time cost is low.

[0024] (2) The present invention adopts a multi-frequency point-based time delay, amplitude and phase correction algorithm to correct the time delay, amplitude and phase inconsistency of the transmission channel and realize broadband correction of the system.

[0025] (3) The present invention adopts a transmission correction design based on a correction selection switch. Compared with the serial coupling network correction scheme, the transmission path of the transmission coupling signal of each channel is independent. When the system is in the transmission state, the coupling signals of N transmission channels can be selected one by one through the correction selection switch. By measuring the power of the transmission coupling signal, real-time power monitoring of all transmission channels of the digital array interference system can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a transmission correction device for a broadband digital array jamming system disclosed in Example 1 of the present invention;

[0027] Figure 2This is a circuit block diagram of a digital transceiver board in a broadband digital array interference system transmission correction method disclosed in Example 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of a transmission channel correction timing design in a broadband digital array jamming system transmission correction method disclosed in Example 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of the timing design of the transmission channel power monitoring function in the transmission correction method of a broadband digital array interference system disclosed in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figure 1 As shown, the present invention provides a method for transmitting correction of a broadband digital array interference system. The core idea is: when correcting the transmission of a broadband digital array interference system, a correction design scheme based on transmission coupling + correction selection switch is adopted. The coupled output signal of each transmission channel is selected by the correction selection switch and then sent to the correction receiver. By sequentially selecting the coupled output signal of each transmission channel, the time delay and amplitude and phase inconsistency data of all transmission channels are obtained, thereby realizing transmission correction. This transmission correction design has the advantages of simple equipment composition, good isolation between channels, and high accuracy of time delay and amplitude phase correction. In the following, combined with the attached Figures 1-4 The process of the present invention is described in detail.

[0033] Continue reading Figure 1 The broadband digital array interference system transmission correction method proposed in the present invention is applied to a broadband digital array interference system transmission correction device. The broadband digital array interference system transmission correction device includes a correction source, N transmission channels, a correction selection switch, a correction receiver, a signal processing module and other equipment.

[0034] Among them, the correction source is composed of a multi-channel digital transceiver circuit, and the core components of the digital transceiver circuit are DAC and FPGA, which are used to generate correction signal waveforms for N transmission channels; the N transmission channels are N transmitters of the array interference system, including an excitation amplification module and a solid-state power amplifier component, which are used to achieve power amplification of low-power interference signals, wherein a coupler is provided inside the solid-state power amplifier component, and the high-power output signal is sent to the transmitting antenna array through an RF cable, and the coupled output signal is sent to the correction selection switch; the correction selection switch is an N-to-1 switch, which receives the transmission coupled signals of the N transmission channels and selects one of them to be output to the correction receiver through switch control; the correction receiver is a digital receiving module composed of ADC and FPGA, which is used to realize digital processing and digital down-conversion of the correction signal, and send the digital intermediate frequency data to the signal processing module; the signal processing module receives the digital intermediate frequency data sent by the correction receiver, and calculates the time delay and amplitude and phase inconsistency information of the multiple signals. In this embodiment, the correction source, correction receiver, and signal processing module adopt a highly integrated design. The hardware form is an 8-channel VPX digital transceiver board. This board can realize the functions of generating 8 correction signals, receiving 1 correction signal, and processing correction signals. The digital transceiver board mainly consists of 4 two-channel ADCs, 2 FPGAs, and 2 four-channel DACs. The hardware principle block diagram of the digital transceiver board is shown in the figure. Figure 2 In a specific implementation, the number of digital transceiver boards can be flexibly expanded according to the system scale.

[0035] The correction timing design of the broadband digital array jamming system transmission correction method provided by the present invention is as follows: Figure 3 As shown in the figure, the correction process mainly includes three parts: transmission channel delay correction, transmission channel delay compensation, and transmission channel amplitude and phase correction.

[0036] The transmit channel delay correction uses a three-frequency point correction method with the following steps: S1: The correction source simultaneously generates N correction point frequency signals (frequencies f1 to f3) with identical delays and initial phases according to the correction sequence; S2: The correction signals are amplified by the N transmit channels and coupled by a coupler before being sent to the correction selection switch; S3: Under the control of the correction control command, the correction selection switch selects the N transmit coupled signals one by one and sends them to the correction receiver. In this embodiment, the correction selection switch is a 16-to-1 switch, which selects any channel using a 4-bit serial code; S4: The correction receiver obtains correction sample signals for the N transmit channels through ADC and DDC processing; S5: The signal processing module processes the N correction sample signals to obtain a delay compensation table for all transmit channels.

[0037] When calibrating the amplitude and phase of the transmitting channel, the number of frequency points m to be corrected is determined according to the operating frequency range of the system. The calibration frequency interval is 10MHz, and a frequency point is taken every 10MHz within the operating frequency range. The detailed steps of amplitude and phase calibration are as follows: S1', the calibration source generates N correction point frequency signals (frequencies f1 to f2) with the same time delay and initial phase according to the calibration sequence. m ); S2', N-channel digital correction signals complete delay compensation in the digital domain according to the delay compensation table, and after DAC conversion, the delay-compensated RF correction signals are sent to the N-channel transmission channels; S3': The correction signals are amplified by the N-channel transmission channels and coupled by the coupler before being sent to the correction selection switch; S4': The correction selection switch, under the control of the correction control instruction, selects the N-channel transmission coupled signals one by one and sends them to the correction receiver; S5': The correction receiver obtains correction sample signals for the N transmission channels after ADC and DDC processing; S6': The signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction table for all transmission channels.

[0038] The emission calibration process is further described in detail here.

[0039] (1) The principle of measuring the fixed delay of a channel using two point frequency signals is as follows:

[0040] Assume that the fixed delay value of two channels is τ, and the phase difference between the two channels at frequencies f1 and f2 are Δφ1 and Δφ2 respectively. Let Δf=f2-f1, Then there is

[0041] M is an integer.

[0042] when hour,

[0043] From this we can conclude

[0044] Channel delay

[0045] Delay measurement accuracy

[0046] It can be seen from the above formula that the delay measurement accuracy is related to Δf. The larger the Δf value is, the higher the delay measurement accuracy is. In order to ensure that under a certain signal-to-noise ratio No ambiguity, generally requiring |Δfτ|<0.4.

[0047] (2) Transmit channel delay correction:

[0048] In this embodiment, in order to improve the delay measurement accuracy and ensure reliable phase difference resolution, a three-frequency point correction method is adopted. The correction signal frequencies are f1, f2, and f3, and the correction frequencies meet

[0049]

[0050] Where Δf1=f2-f1, Δf2=f3-f1, To correct the phase difference between the two channels when the signal frequency difference is Δf1, To correct the phase difference between the two channels when the signal frequency difference is Δf2. Δf1 is used to ensure the measured phase difference Unambiguous, Δf2 is used to improve the delay measurement accuracy.

[0051] Then there is According to this formula, the value of M can be calculated.

[0052] The final two-channel delay measurement results are: Using this formula and the delay correction process, 3N correction samples are obtained and the delay values ​​of N transmission channels are calculated (channel 1 is selected as the reference channel).

[0053] (3) Transmitting channel delay compensation:

[0054] Delay compensation is achieved by delaying the digital baseband signal by an integer multiple, so it is necessary to calculate the sample delay of each transmit channel of the digital array system. The formula for calculating the number of delayed sample points is as follows:

[0055] n=round(f s *τ), where f s is the AD sampling frequency in MHz, and τ is in ns.

[0056] Taking transmit channel 1 as the reference channel, calculate the number of delay sample points n of all channels relative to the reference channel to form a delay compensation table.

[0057] (4) Transmitting channel amplitude and phase correction:

[0058] During amplitude and phase correction, first perform delay compensation on the digital correction signals of the N transmit channels according to the delay compensation table, and then calculate the amplitude and phase compensation coefficients of the N transmit channels based on the collected amplitude and phase correction samples (I+jQ) to form the amplitude and phase correction table.

[0059] The calculation formula for the amplitude and phase correction coefficient is: x iis the complex correction sample collected by the i-th transmission channel, and x1 is the complex correction sample of the reference channel. Here, because the correction receiver is an orthogonal dual-channel receiver, the signals it collects are divided into I and Q channels. The I channel represents the in-phase component of the signal, and the Q channel represents the quadrature component. The I and Q channels together constitute the correction sample signal, which is in the form of I+jQ. Therefore, the correction sample signal belongs to a complex correction sample. When calculating the amplitude and phase correction coefficient of the i-th transmission channel, it is equivalent to dividing the complex correction sample collected by the i-th transmission channel by the complex correction sample collected by the reference channel. When the digital array interference system of the present invention is operating in the transmission state, the digital transceiver circuit performs digital delay, amplitude and phase weighting processing on the baseband digital interference signal according to the delay compensation table and the amplitude and phase correction table. The processed baseband digital interference signal is then converted into a radio frequency interference signal through D / A conversion. After passing through the transmission channel and the transmitting antenna array, it forms an interference beam pointing to the target airspace.

[0060] The power monitoring function timing design of a broadband digital array jamming system transmission correction method and device described in the present invention is as follows Figure 4 As shown. The broadband digital array interference system described in the present invention has independent transmission paths for the transmission coupled signals of each channel. When the system is in the transmitting state, the correction selection switch selects the coupling signals of N transmission channels one by one. By measuring the power of the transmission coupled signals, real-time power monitoring of all transmission channels of the digital array interference system can be achieved. In the design of the array transmitter, the transmission power monitoring function is an important function and an effective means to judge the working status of the transmitter. The transmission power monitoring function generally designs a detection circuit inside the transmission channel, and realizes transmission power monitoring by performing RF detection and level detection on the coupled output signal of the transmission channel. This method requires the design of a special detection circuit inside each transmission channel. The broadband digital array interference system described in the present invention does not require the design of a special detection circuit inside each transmission channel. The power monitoring function of the array interference system can be realized by multiplexing the RF switch and the correction receiver of the transmission correction function. It has the advantages of low hardware cost, simple and reliable system, etc. When used as a power monitoring function, the control timing of the correction selection switch is as follows: Figure 4 As shown, in this embodiment, the gating time of each transmission coupling signal is 50ms, and the average power S of the transmission coupling signal is calculated based on the sampling samples within 50ms. i In this embodiment, the coupling degree of the transmitting coupler is -50dB, so S i +50dB is the actual output power of the transmitting channel.

[0061] Through the above technical solution, the present invention adopts a transmission correction design based on a correction selector switch. Compared with the serial coupling network correction scheme, this eliminates the testing steps and measurement errors of the coupling network delay and amplitude-phase inconsistency. The solution process is relatively simple and time-consuming. Using a multi-frequency delay and amplitude-phase correction algorithm, it can correct the delay, amplitude, and phase inconsistencies of the transmission channel, achieving broadband correction of the system.

[0062] Example 2

[0063] Embodiment 2 of the present invention provides another method for calibrating the transmission of a broadband digital array jamming system. This method differs from Embodiment 1 in that Embodiment 2 only involves the amplitude and phase correction process. The delay compensation involved in this process uses existing technology or a pre-given delay compensation table, rather than the delay compensation table obtained by the three-frequency point correction method provided in Embodiment 1. Therefore, the delay compensation table is not particularly limited, and the amplitude and phase correction process is primarily protected. The specific process is as follows:

[0064] Continue reading Figure 1 The broadband digital array interference system transmission correction method proposed in the present invention is applied to a broadband digital array interference system transmission correction device. The broadband digital array interference system transmission correction device includes a correction source, N transmission channels, a correction selection switch, a correction receiver, a signal processing module and other equipment.

[0065] Among them, the correction source is composed of a multi-channel digital transceiver circuit, and the core components of the digital transceiver circuit are DAC and FPGA, which are used to generate correction signal waveforms for N transmission channels; the N transmission channels are N transmitters of the array interference system, including an excitation amplification module and a solid-state power amplifier component, which are used to achieve power amplification of low-power interference signals, wherein a coupler is provided inside the solid-state power amplifier component, and the high-power output signal is sent to the transmitting antenna array through an RF cable, and the coupled output signal is sent to the correction selection switch; the correction selection switch is an N-to-1 switch, which receives the transmission coupled signals of the N transmission channels and selects one of them to be output to the correction receiver through switch control; the correction receiver is a digital receiving module composed of ADC and FPGA, which is used to realize digital processing and digital down-conversion of the correction signal, and send the digital intermediate frequency data to the signal processing module; the signal processing module receives the digital intermediate frequency data sent by the correction receiver, and calculates the time delay and amplitude and phase inconsistency information of the multiple signals. In this embodiment, the correction source, correction receiver, and signal processing module adopt a highly integrated design. The hardware form is an 8-channel VPX digital transceiver board. This board can realize the functions of generating 8 correction signals, receiving 1 correction signal, and processing correction signals. The digital transceiver board mainly consists of 4 two-channel ADCs, 2 FPGAs, and 2 four-channel DACs. The hardware principle block diagram of the digital transceiver board is shown in the figure. Figure 2In a specific implementation, the number of digital transceiver boards can be flexibly expanded according to the system scale.

[0066] When calibrating the amplitude and phase of the transmitting channel, the number of frequency points m to be calibrated is determined according to the operating frequency range of the system, and the calibration frequency interval is 10MHz. The detailed steps of amplitude and phase calibration are as follows: S1', the calibration source generates N calibration point frequency signals (frequencies f1 to f2) with the same time delay and initial phase according to the calibration sequence. m ); S2', N-channel digital correction signals complete delay compensation in the digital domain according to the delay compensation table, and after DAC conversion, the delay-compensated RF correction signals are sent to the N-channel transmission channels; S3': The correction signals are amplified by the N-channel transmission channels and coupled by the coupler before being sent to the correction selection switch; S4': The correction selection switch, under the control of the correction control instruction, selects the N-channel transmission coupled signals one by one and sends them to the correction receiver; S5': The correction receiver obtains correction sample signals for the N transmission channels after ADC and DDC processing; S6': The signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction table for all transmission channels.

[0067] During amplitude and phase correction, first perform delay compensation on the digital correction signals of the N transmit channels according to the delay compensation table, and then calculate the amplitude and phase compensation coefficients of the N transmit channels based on the collected amplitude and phase correction samples (I+jQ) to form the amplitude and phase correction table.

[0068] The calculation formula for the amplitude and phase correction coefficient is: x i The complex calibration samples collected for each transmit channel, x1 is the complex calibration sample of channel 1 as the reference channel.

[0069] The digital array interference system described in the present invention, when operating in the transmitting state, the digital transceiver circuit performs digital delay, amplitude and phase weighted processing on the baseband digital interference signal according to the delay compensation table and the amplitude and phase correction table, and then converts the processed baseband digital interference signal into a radio frequency interference signal through D / A conversion, and forms an interference beam pointing to the target airspace after passing through the transmitting channel and the transmitting antenna array.

[0070] The power monitoring function timing design of a broadband digital array jamming system transmission correction method and device described in the present invention is as follows Figure 4As shown. The broadband digital array interference system described in the present invention has independent transmission paths for the transmission coupled signals of each channel. When the system is in the transmitting state, the correction selection switch selects the coupling signals of N transmission channels one by one. By measuring the power of the transmission coupled signals, real-time power monitoring of all transmission channels of the digital array interference system can be achieved. In the design of the array transmitter, the transmission power monitoring function is an important function and an effective means to judge the working status of the transmitter. The transmission power monitoring function generally designs a detection circuit inside the transmission channel, and realizes transmission power monitoring by performing RF detection and level detection on the coupled output signal of the transmission channel. This method requires the design of a special detection circuit inside each transmission channel. The broadband digital array interference system described in the present invention does not require the design of a special detection circuit inside each transmission channel. The power monitoring function of the array interference system can be realized by multiplexing the RF switch and the correction receiver of the transmission correction function. It has the advantages of low hardware cost, simple and reliable system, etc. When used as a power monitoring function, the control timing of the correction selection switch is as follows: Figure 4 As shown, in this embodiment, the gating time of each transmission coupling signal is 50ms, and the average power S of the transmission coupling signal is calculated based on the sampling samples within 50ms. i In this embodiment, the coupling degree of the transmitting coupler is -50dB, so S i +50dB is the actual output power of the transmitting channel.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A broadband digital array jamming system emission correction method, characterized in that: The invention comprises a time delay correction process, which includes: a correction source simultaneously generates N correction point frequency signals with completely consistent time delay and initial phase, and the frequency variation of each correction point frequency signal is f1 to f3; each correction point frequency signal is respectively amplified by a transmission channel and coupled by a coupler, and then sent to a correction selection switch; the correction selection switch selects the N coupled signals one by one and sends them to a correction receiver; the correction receiver outputs correction sample signals of N transmission channels; and a signal processing module processes the N correction sample signals (a total of 3N) using a three-frequency point correction method to obtain a time delay compensation table for all transmission channels.

2. A broadband digital array jamming system emission correction method according to claim 1, characterized in that: The three-frequency point correction method includes: Each correction frequency signal meets Among them, Δf1=f2-f1, Δf2=f3-f1, To correct the phase difference between the two channels when the signal frequency difference is Δf1, To correct the phase difference between the two channels when the signal frequency difference is Δf2; According to this formula, the value of the weight coefficient M is calculated; the two-channel delay measurement result is Designate any one of all the transmission channels as the reference channel, calculate the sample delay of each transmission channel to form a delay compensation table to perform delay compensation on each transmission channel. The calculation formula for the number of delayed sample points is n=round(f s *τ), where f s is the AD sampling frequency, and τ is the two-channel delay measurement result, that is, the delay value of the current transmitting channel relative to the reference channel.

3. The broadband digital array jamming system emission correction method according to claim 1, wherein: It also includes the amplitude and phase correction process, which includes: The number of frequency points m for correction is determined according to the operating frequency range of the system and the correction frequency interval; the correction source simultaneously generates N correction point frequency signals with completely consistent time delay and initial phase, and the frequency change of each correction point frequency signal is f1~f m ; N-channel correction point frequency signals complete delay compensation according to the delay compensation table, and the delay-compensated RF correction signals are sent to N transmission channels after DAC conversion. After being amplified by the N transmission channels and coupled by the coupler, they are sent to the correction selection switch; the correction selection switch selects the N-channel coupled signals one by one and sends them to the correction receiver; the correction receiver outputs the correction sample signals of the N transmission channels; the signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction tables of all transmission channels.

4. The broadband digital array jamming system emission correction method according to claim 3, characterized in that: The signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction tables for all transmit channels, including: According to the collected correction sample signal, the amplitude and phase compensation coefficients of N transmission channels are calculated respectively to form an amplitude and phase correction table. The calculation formula of the amplitude and phase compensation coefficient is: x i is the calibration sample signal collected by the i-th transmission channel, x1 is the calibration sample signal of the reference channel, and the reference channel is any one of all the transmission channels.

5. The broadband digital array jamming system emission correction method according to claim 3, characterized in that: When working in the transmitting state, the signal processing module performs digital delay, amplitude and phase weighted processing on the baseband digital interference signal according to the time delay compensation table and amplitude and phase correction table, and then converts the processed baseband digital interference signal into a radio frequency interference signal through the D / A conversion of the correction source, and forms an interference beam pointing to the target airspace after passing through the transmitting channel and the transmitting antenna array.

6. A device for applying the method for calibrating transmission of a broadband digital array jamming system according to any one of claims 1 to 5, characterized in that: The system includes N correction sources, N transmission channels, a correction selection switch, a correction receiver, and a signal processing module. The N correction sources are respectively connected to the N transmission channels. The output ends of the N transmission channels are respectively connected to N antenna elements of the transmitting antenna array. The N transmission channels are also respectively connected to the correction selection switch through a coupler. The correction selection switch is connected to the signal processing module through the correction receiver.

7. A broadband digital array jamming system emission correction method, characterized in that: Including the amplitude and phase correction process, the amplitude and phase correction process includes: The number of frequency points m for correction is determined according to the operating frequency range of the system and the correction frequency interval; the correction source simultaneously generates N correction point frequency signals with completely consistent time delay and initial phase, and the frequency change of each correction point frequency signal is f1~f m ; N-channel correction point frequency signals complete delay compensation according to the delay compensation table, and the delay-compensated RF correction signals are sent to N transmission channels after DAC conversion. After being amplified by the N transmission channels and coupled by the coupler, they are sent to the correction selection switch; the correction selection switch selects the N-channel coupled signals one by one and sends them to the correction receiver; the correction receiver outputs the correction sample signals of the N transmission channels; the signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction tables of all transmission channels.

8. The method for calibrating a broadband digital array jamming system emission according to claim 7, wherein: The signal processing module processes the N-channel correction sample signals to obtain the amplitude and phase correction tables for all transmit channels, including: According to the collected correction sample signal, the amplitude and phase compensation coefficients of N transmission channels are calculated respectively to form an amplitude and phase correction table. The calculation formula of the amplitude and phase compensation coefficient is: x i is the calibration sample signal collected by the i-th transmission channel, x1 is the calibration sample signal of the reference channel, and the reference channel is any one of all the transmission channels.

9. The broadband digital array jamming system emission correction method according to claim 7, characterized in that: When working in the transmitting state, the signal processing module performs digital delay, amplitude and phase weighted processing on the baseband digital interference signal according to the time delay compensation table and amplitude and phase correction table, and then converts the processed baseband digital interference signal into a radio frequency interference signal through the D / A conversion of the correction source, and forms an interference beam pointing to the target airspace after passing through the transmitting channel and the transmitting antenna array.

10. A device using the broadband digital array jamming system emission correction method according to any one of claims 7 to 9, characterized in that: The system includes N correction sources, N transmission channels, a correction selection switch, a correction receiver, and a signal processing module. The N correction sources are respectively connected to the N transmission channels. The output ends of the N transmission channels are respectively connected to N antenna elements of the transmitting antenna array. The N transmission channels are also respectively connected to the correction selection switch through a coupler. The correction selection switch is connected to the signal processing module through the correction receiver.

Images