A RCS test system and method based on multi-channel parallel testing

Abstract

The invention belongs to the technical field of microwave testing, and discloses an RCS testing system and method based on multi-channel parallel testing. The system comprises a test timing controller and a plurality of test channels; the test timing controller is used for sending an acquisition trigger signal and a synchronization trigger signal to each test channel; the plurality of test channels are connected to the test timing controller in parallel, and the plurality of test channels correspond to a plurality of test sub-frequency bands one by one; each test channel comprises a vector network analyzer, a transmitting link, a receiving link and a modulation pulse generator; the acquisition trigger signal is used for triggering the vector network analyzer to acquire echo signal data in a received radio frequency signal in the receiving link; the synchronization trigger signal is used for triggering the modulation pulse generator to adjust the delay of the modulation pulse signal, so that the delays of the modulation pulse signals in all the test channels are aligned at a preset time; the invention greatly reduces the error probability while improving the test efficiency, and improves the accuracy of the test result.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave testing, and in particular relates to an RCS testing system and method based on multi-channel parallel testing. Background Art

[0002] The RCS (Radar Cross Section) test is a test method to measure the intensity of the echo generated by a target when it is illuminated by radar waves. It is an important indicator for evaluating the stealth performance of equipment. Among them, the RCS test system is widely used in radar cross-section measurements of various types of equipment.

[0003] Traditional RCS test systems usually use a single vector network analyzer, and connect the transmit link and receive link to the transmit port and receiver interface of the vector network analyzer respectively. During the test, the scattering (Scatter, S) parameters of multiple frequency points are tested to obtain the reflection intensity of the device under test (DUT).

[0004] At present, as the test frequency range increases, it is often necessary to divide the test frequency band into several test sub-bands for testing; and during the testing process of different test sub-bands, it is necessary to frequently replace RF devices and transceiver feed sources, such as power amplifiers, low noise amplifiers and modulators, resulting in low efficiency of traditional RCS test systems and the test process is prone to errors. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the present invention provides an RCS test system and method based on multi-channel parallel testing to solve the technical problems that the traditional RCS test system is inefficient in the test process of different test sub-frequency bands and the test process is prone to errors.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides an RCS test system based on multi-channel parallel testing, comprising a test timing controller and a plurality of test channels; the test timing controller is used to send an acquisition trigger signal and a synchronization trigger signal to each test channel; the plurality of test channels are connected in parallel to the test timing controller, and the plurality of test channels correspond to a plurality of test sub-frequency bands one by one;

[0008] Each test channel includes a vector network analyzer, a transmitting link, a receiving link and a modulated pulse generator; the vector network analyzer is used to send a continuous wave RF excitation signal to the transmitting link and is also used to collect echo signal data from the received RF signal in the receiving link; the modulated pulse generator is used to send modulated pulse signals to the transmitting link and the receiving link;

[0009] The acquisition trigger signal is used to trigger the vector network analyzer to acquire the echo signal data in the received RF signal in the receiving link; the synchronization trigger signal is used to trigger the modulation pulse generator to adjust the delay of the modulation pulse signal so that the delay of the modulation pulse signals in all test channels is aligned at the preset time.

[0010] Furthermore, the transmission link includes a transmission modulation module, a transmission link polarization switch and a transmission feed;

[0011] The input end of the transmission modulation module is connected to the transmission port of the vector network analyzer, and the output end of the transmission modulation module is connected to the input end of the transmission link polarization switch; the horizontal polarization switch interface of the transmission link polarization switch is connected to the horizontal polarization transmission port of the transmission feed source, and the vertical polarization switch interface of the transmission link polarization switch is connected to the vertical polarization transmission port of the transmission feed source.

[0012] Furthermore, the receiving link includes a receiving feed, a receiving link polarization switch and a receiving modulation module;

[0013] The horizontal polarization receiving port of the receiving feed source is connected to the horizontal polarization switch interface of the receiving link polarization switch, and the vertical polarization receiving port of the receiving feed source is connected to the vertical polarization switch interface of the receiving link polarization switch; the output end of the receiving link polarization switch is connected to the input end of the receiving modulation module, and the output end of the receiving modulation module is connected to the receiver interface of the vector network analyzer.

[0014] Further, the modulation pulse generator is provided with a first modulation pulse output interface and a second modulation pulse output interface;

[0015] The first modulation pulse output interface is connected to the control interface of the transmission modulation module, and the second modulation pulse output interface is connected to the control interface of the reception modulation module;

[0016] The modulation pulse generator is used to generate and send two modulation pulse signals; wherein the first modulation pulse signal is sent to the transmitting modulation module through the first modulation pulse output interface, and the second modulation pulse signal is sent to the receiving modulation module through the second modulation pulse output interface.

[0017] Furthermore, any two modulated pulse signals in all test channels satisfy:

[0018] when When:

[0019]

[0020] when When:

[0021]

[0022] in, For the Delay of the modulated pulse signal; For the Delay of the modulated pulse signal; For the The pulse width of the modulated pulse signal; For the The pulse width of the modulated pulse signal; The time required for the modulation pulse generator to switch on and off.

[0023] Furthermore, the trigger signal is collected to meet the following conditions:

[0024]

[0025] in, To test the timing controller The delay of the acquisition trigger signal sent in each test channel; To test the timing controller The delay of the acquisition trigger signal sent in each test channel; is the intermediate frequency bandwidth of the vector network analyzer.

[0026] Further, The test termination frequency of the test channel is The test start frequencies of the test channels are equal.

[0027] Furthermore, the intermediate frequency bandwidth of the vector network analyzer in each test channel satisfies:

[0028]

[0029] in, is the intermediate frequency bandwidth of the vector network analyzer; is the pulse repetition frequency of the modulated pulse signal.

[0030] Furthermore, it also includes a motion controller; the in-position trigger output interface of the motion controller is connected to the in-position trigger input interface of the test timing controller; wherein the motion controller is used to generate and send an in-position trigger signal to the test timing controller.

[0031] The present invention also provides an RCS test method based on multi-channel parallel test, using the RCS test system based on multi-channel parallel test;

[0032] Among them, the RCS test method based on multi-channel parallel testing includes:

[0033] Using a vector network analyzer, a continuous wave RF excitation signal is sent to the transmission link;

[0034] A test timing controller is used to send a synchronization trigger signal to each test channel; wherein, when the modulation pulse generator in each test channel receives the synchronization trigger signal, the delay of the modulation pulse signal is adjusted so that the delay of the modulation pulse signals in all test channels is aligned at a preset time;

[0035] Pulse modulating the continuous wave radio frequency excitation signal using the modulated pulse signal to obtain and send the transmit radio frequency signal to free space;

[0036] Using a receiving link to receive scattered radio frequency signals generated by the equipment under test;

[0037] Pulse modulating the scattered radio frequency signal using a modulated pulse signal, obtaining and sending a received radio frequency signal to a vector network analyzer;

[0038] The test timing controller is used to send an acquisition trigger signal to each test channel. After receiving the acquisition trigger signal, the vector network analyzer starts to acquire echo signal data in the received radio frequency signal in the receiving link.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The RCS test system based on multi-channel parallel test provided by the present invention connects a plurality of test channels in parallel to a test timing controller, and sets the test channels and test sub-frequency bands in one-to-one correspondence, which can simultaneously meet the requirements of parallel testing of different test sub-frequency bands under a preset test frequency band, and effectively improves the system test efficiency; during the test process, there is no need to replace the radio frequency device and the transceiver feed source, which greatly reduces the error probability while improving the test efficiency, and improves the accuracy of the test result; wherein, a synchronous trigger signal is sent to each test channel by using the test timing controller, so that the delay of the modulated pulse signals in all the test channels is aligned at a preset time, and the accurate synchronization of all the test channels at the preset time is ensured, and the consistency and accuracy of the RCS test are effectively enhanced; secondly, an acquisition trigger signal is sent to each test channel by using the test timing controller, which can achieve the purpose of parallel testing of multiple test channels under the premise of avoiding interference between the test channels, and effectively improves the test efficiency.

[0041] The RCS test method based on multi-channel parallel testing provided by the present invention has all the advantages of the above-mentioned RCS test system based on multi-channel parallel testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A structural block diagram of an RCS test system based on multi-channel parallel testing provided in Example 1;

[0044] Figure 2 Schematic diagram of the working principle of the modulated pulse signal in Example 1;

[0045] Figure 3 This is a schematic diagram of the principle of data acquisition by the vector network analyzer in Example 1.

[0046] Among them, 1 is a test timing controller, 2 is a vector network analyzer, 3 is a transmitting modulation module, 4 is a transmitting link polarization switch, 5 is a transmitting feed source, 6 is a receiving feed source, 7 is a receiving link polarization switch, 8 is a receiving modulation module, 9 is a modulation pulse generator, and 10 is a motion controller. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be described clearly and completely in combination with the drawings in the embodiments of this application; obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Example 1

[0049] As attached Figure 1 As shown, this embodiment 1 provides an RCS test system based on multi-channel parallel testing, including a test timing controller 1, a plurality of test channels and a motion controller 10. The plurality of test channels are connected in parallel to the test timing controller 1, the number of the plurality of test channels is the same as the number of the plurality of test sub-frequency bands, and the plurality of test channels correspond to the plurality of test sub-frequency bands one by one; the in-position trigger output interface of the motion controller 10 is connected to the test timing controller 1.

[0050] It should be noted that, during the RCS test process, the preset test frequency band of the equipment to be tested is divided according to the feed bandwidth to obtain several test sub-bands; wherein, the frequency interval of each test sub-band is the same. In the present embodiment 1, the frequency range of each test sub-band corresponds to the test frequency range of the corresponding test channel; for example: when the number of test sub-bands is N, the number of test channels is also N; wherein, the first test sub-band corresponds to the first test channel, and the second test sub-band corresponds to the second test channel; and so on, the Nth test sub-band corresponds to the Nth test channel; similarly, the frequency range of the first test sub-band is the test frequency range of the first test channel, and the frequency range of the second test sub-band is the test frequency range of the second test channel; and so on, the frequency range of the Nth test sub-band is the test frequency range of the Nth test channel.

[0051] Among them, The test frequency range of each test channel is as follows:

[0052]

[0053] in, For the The test start frequency of the test channel, that is, The starting frequency of each test sub-band; For the The test termination frequency of the test channel, that is, The stop frequency of the test sub-band.

[0054] No. The test termination frequency of the test channel is The test start frequencies of the test channels are equal, which satisfies:

[0055]

[0056] in, For the The test start frequency of each test channel.

[0057] In this embodiment 1, the test timing controller 1 adopts a channel beam controller (Generic Beam Controller for RCS, GBC-R); the test timing controller 1 is provided with a plurality of acquisition trigger output interfaces, a plurality of synchronization trigger output interfaces and an in-place trigger input interface; wherein, the plurality of acquisition trigger output interfaces are used to be connected to the corresponding signal input interfaces of the vector network analyzers 2 in the plurality of test channels, the plurality of synchronization trigger output interfaces are used to be connected to the corresponding synchronization trigger input interfaces of the modulation pulse generators 9 in the plurality of test channels, and the in-place trigger input interface is used to be connected to the in-place trigger output interface of the motion controller 10.

[0058] The test timing controller 1 is used to send an acquisition trigger signal and a synchronization trigger signal to each test channel; the acquisition trigger signal is used to trigger the vector network analyzer 2 to acquire the echo signal data in the received RF signal in the receiving link; for example: if the The vector network analyzer 2 in the test channel receives the acquisition trigger signal, then The vector network analyzer 2 in each test channel starts to collect echo signal data in the received RF signal in the receiving link; the synchronization trigger signal is used to trigger the modulation pulse generator 9 to adjust the delay of the modulation pulse signal, so that the delay of the modulation pulse signals in all test channels is aligned at the preset time, ensuring the delay consistency and accuracy of the modulation pulse signals in all test channels, and further ensuring the precise synchronization of all test channels at the preset time.

[0059] It should be noted that by adjusting the trigger delay relationship of the acquisition trigger signal sent to each test channel, it is possible to achieve isolation of several test channels in the time domain, avoid mutual interference in the test process, and thus meet the parallel test requirements of multiple test channels; wherein, the acquisition trigger signal satisfies:

[0060]

[0061] in, To test the timing controller 1 to the The delay of the acquisition trigger signal sent in each test channel; To test the timing controller 1 to the The delay of the acquisition trigger signal sent in each test channel, ; is the intermediate frequency bandwidth of vector network analyzer 2.

[0062] Each test channel includes a vector network analyzer 2, a transmitting link, a receiving link and a modulation pulse generator 9; the signal input interface of the vector network analyzer 2 is connected to the acquisition trigger output interface of the test timing controller 1, the transmitting link is connected to the transmitting port of the vector network analyzer 2, and the receiving link is connected to the receiver interface of the vector network analyzer 2; the synchronous trigger input interface of the modulation pulse generator 9 is connected to the synchronous trigger output interface of the test timing controller 1, and the modulation pulse output interface of the modulation pulse generator 9 is connected to both the transmitting link and the receiving link.

[0063] The transmission link includes a transmission modulation module 3, a transmission link polarization switch 4 and a transmission feed 5; the input end of the transmission modulation module 3 is connected to the transmission port of the vector network analyzer 2, and the output end of the transmission modulation module 3 is connected to the input end of the transmission link polarization switch 4; the horizontal polarization switch interface of the transmission link polarization switch 4 is connected to the horizontal polarization transmission port of the transmission feed 5, and the vertical polarization switch interface of the transmission link polarization switch 4 is connected to the vertical polarization transmission port of the transmission feed 5.

[0064] The working principle of the transmission link is as follows:

[0065] A vector network analyzer 2 is used to send a continuous wave RF excitation signal to a transmitting modulation module 3; then, in the transmitting modulation module 3, a modulation pulse signal sent by a modulation pulse generator 9 is used to perform pulse modulation processing on the continuous wave RF excitation signal to obtain a transmitting RF signal; wherein the transmitting RF signal is a horizontally polarized transmitting RF signal or a vertically polarized transmitting RF signal; a transmitting link polarization switch 4 is used to switch the polarization direction of the transmitting feed 5, and the transmitting feed 5 is used to transmit the transmitting RF signal to free space; wherein, when the polarization direction of the transmitting feed 5 is switched to horizontal polarization, the transmitting feed 5 is used to transmit the horizontally polarized transmitting RF signal to free space; when the polarization direction of the transmitting feed 5 is switched to vertical polarization, the transmitting feed 5 is used to transmit the vertically polarized transmitting RF signal to free space; it should be noted that the equipment under test is placed in the free space, and when the transmitting RF signal enters the free space, the equipment under test in the free space can generate a scattered RF signal.

[0066] The receiving link includes a receiving feed 6, a receiving link polarization switch 7 and a receiving modulation module 8; the horizontal polarization receiving port of the receiving feed 6 is connected to the horizontal polarization switch interface of the receiving link polarization switch 7, and the vertical polarization receiving port of the receiving feed 6 is connected to the vertical polarization switch interface of the receiving link polarization switch 7; the output end of the receiving link polarization switch 7 is connected to the input end of the receiving modulation module 8, and the output end of the receiving modulation module 8 is connected to the receiver interface of the vector network analyzer 2.

[0067] The working principle of the receiving link is as follows:

[0068] The polarization direction of the receiving feed 6 is switched by using the receiving link polarization switch 7, and the scattered RF signal generated by the equipment under test is received by using the receiving feed 6, and the scattered RF signal is sent to the receiving modulation module 8; it should be noted that the scattered RF signal generated by the equipment under test is a horizontally polarized scattered RF signal or a vertically polarized scattered RF signal; if it is a horizontally polarized scattered RF signal, the polarization direction of the receiving feed 6 is switched to horizontal polarization by using the receiving link polarization switch 7; if it is a vertically polarized scattered RF signal, the polarization direction of the receiving feed 6 is switched to vertical polarization by using the receiving link polarization switch 7; then, in the receiving modulation module 8, the scattered RF signal is pulse modulated by using the modulated pulse signal sent by the modulation pulse generator 9 to obtain a received RF signal; wherein the received RF signal is a horizontally polarized received RF signal or a vertically polarized received RF signal; then, when the vector network analyzer 2 receives the acquisition trigger signal sent by the test timing controller 1, the echo signal data in the received RF signal is collected by using the vector network analyzer 2.

[0069] The modulation pulse generator 9 is provided with a first modulation pulse output interface and a second modulation pulse output interface, the first modulation pulse output interface is connected to the control interface of the transmitting modulation module 3, and the second modulation pulse output interface is connected to the control interface of the receiving modulation module 8; the modulation pulse generator 9 is used to generate and send two modulation pulse signals; wherein, the first modulation pulse signal is sent to the transmitting modulation module 3 through the first modulation pulse output interface, and the second modulation pulse signal is sent to the receiving modulation module 8 through the second modulation pulse output interface; it should be noted that the delay value of the second modulation pulse signal relative to the first modulation pulse signal is equal to the time interval between the transmitting RF signal being transmitted from the transmitting feed source 5 to the scattered RF signal being received by the receiving feed source 6.

[0070] Specifically, after the first modulated pulse signal is input to the transmitting modulation module 3, the continuous wave RF excitation signal is pulse modulated to obtain a transmitting RF signal; after the second modulated pulse signal is input to the receiving modulation module 8, the scattered RF signal is pulse modulated to obtain a receiving RF signal. It should be noted that the modulated pulse signal is also used to control the on and off of the transmitting link or the receiving link; specifically, if the transmitting link or the receiving link is within the effective level range of the modulated pulse signal, the transmitting link or the receiving link is turned on; otherwise, the transmitting link or the receiving link is turned off; the pulse width and delay of the modulated pulse signal in all test channels are independently adjustable, and the pulse width and delay of the modulated pulse signal are adjusted to isolate the modulated pulse signals in all test channels in the time domain, thereby making the opening time of the transmitting link and the receiving link in all test channels different, ensuring that only one transmitting link or receiving link is in the open state at any time, thereby improving the isolation between links and reducing the crosstalk between test channels, as shown in the attached Figure 2 shown.

[0071] Preferably, any two modulated pulse signals in all test channels satisfy:

[0072] when When:

[0073]

[0074] when When:

[0075]

[0076] in, For the Delay of the modulated pulse signal; For the Delay of the modulated pulse signal; For the The pulse width of the modulated pulse signal; For the The pulse width of the modulated pulse signal; It is the time required for the modulation pulse generator 9 to switch the on and off states.

[0077] In this embodiment 1, the in-place trigger output interface of the motion controller 10 is connected to the in-place trigger input interface of the test timing controller 1; the motion controller 10 is used to generate and send an in-place trigger signal to the test timing controller 1; wherein the in-place trigger signal is used to trigger the test timing controller 1 to generate and send an acquisition trigger signal to the vector network analyzer 2 in the corresponding test channel; specifically, when the test timing controller 1 receives the in-place trigger signal, it generates an acquisition trigger signal according to a preset trigger delay, and sends the acquisition trigger signal to the vector network analyzer 2 in the corresponding test channel, and starts to collect echo signal data in the received RF signal in the receiving link, as shown in the attached Figure 3 shown.

[0078] The RCS test system based on multi-channel parallel testing described in this embodiment 1 divides the preset test frequency band of the equipment under test into several test sub-bands according to the feed bandwidth, and equips several test channels of the same number and one-to-one correspondence according to the divided test sub-bands; by setting a test timing controller 1, and connecting several test channels to the test timing controller 1 in parallel; using the test timing controller 1 to send an acquisition trigger signal and a synchronization trigger signal to each test channel, by adjusting the trigger delay of the acquisition trigger signal, it is possible to effectively control the isolation of the test channel in the time domain, thereby avoiding mutual interference between the test channels, achieving the purpose of parallel testing, and effectively improving the test efficiency; secondly, the modulation pulse generator 9 is triggered by the synchronization trigger signal to adjust the delay of the modulation pulse signal, so that the delay of the modulation pulse signal in all test channels is aligned at the preset time, ensuring the precise synchronization of all test channels at the preset time, and effectively enhancing the consistency and accuracy of the RCS test.

[0079] Example 2

[0080] This embodiment 2 provides an RCS test method based on multi-channel parallel test, using the RCS test system based on multi-channel parallel test described in the above embodiment 1; the test process includes the following steps:

[0081] A vector network analyzer 2 is used to send a continuous wave radio frequency excitation signal to the transmission link.

[0082] A test timing controller 1 is used to send a synchronization trigger signal to each test channel; wherein, when the modulation pulse generator 9 in each test channel receives the synchronization trigger signal, the delay of the modulation pulse signal is adjusted to align the delays of the modulation pulse signals in all test channels at a preset time.

[0083] The modulation pulse generator 9 is used to send modulation pulse signals to the transmitting link and the receiving link respectively.

[0084] The continuous wave radio frequency excitation signal is pulse modulated by using a modulated pulse signal to obtain and send a transmitting radio frequency signal to free space.

[0085] The receiving link is used to receive the scattered RF signal generated by the equipment under test.

[0086] The scattered radio frequency signal is pulse modulated by using a modulated pulse signal, and the received radio frequency signal is obtained and sent to the vector network analyzer 2 .

[0087] The test timing controller 1 is used to send an acquisition trigger signal to each test channel. After receiving the acquisition trigger signal, the vector network analyzer 2 starts to acquire echo signal data in the received radio frequency signal in the receiving link.

[0088] The RCS test system based on multi-channel parallel testing provided by the present invention connects a plurality of test channels in parallel to a test timing controller 1, controls the trigger delay of the plurality of test channels through the test timing controller 1, realizes the requirement of parallel testing of a plurality of test channels, and effectively improves the test efficiency; the test process does not need to replace the radio frequency device and the transceiver feed source, further improves the test efficiency, and effectively reduces the error probability.

[0089] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. An RCS test system based on multi-channel parallel testing, characterized in that: It comprises a test timing controller (1) and a plurality of test channels; the test timing controller (1) is used to send a collection trigger signal and a synchronization trigger signal to each test channel; the plurality of test channels are connected to the test timing controller (1) in parallel, and the plurality of test channels correspond to the plurality of test sub-frequency bands one by one; Each test channel includes a vector network analyzer (2), a transmission link, a receiving link and a modulation pulse generator (9); the vector network analyzer (2) is used to send a continuous wave radio frequency excitation signal to the transmission link, and is also used to collect echo signal data in the radio frequency signal received in the receiving link; the modulation pulse generator (9) is used to send a modulation pulse signal to the transmission link and the receiving link; A collection trigger signal is used to trigger a vector network analyzer (2) to collect echo signal data in a received radio frequency signal in a receiving link; A synchronous trigger signal, used to trigger a modulation pulse generator (9) to adjust the delay of the modulation pulse signal so that the delays of the modulation pulse signals in all test channels are aligned at a preset time; Any two modulated pulse signals in all test channels meet the following requirements: when When: when When: in, For the Delay of the modulated pulse signal; For the Delay of the modulated pulse signal; For the The pulse width of the modulated pulse signal; For the The pulse width of the modulated pulse signal; The time required for the modulation pulse generator (9) to switch between on and off states.

2. The RCS test system based on multi-channel parallel testing according to claim 1, characterized in that: The transmission link comprises a transmission modulation module (3), a transmission link polarization switch (4) and a transmission feed source (5); The input end of the transmission modulation module (3) is connected to the transmission port of the vector network analyzer (2), and the output end of the transmission modulation module (3) is connected to the input end of the transmission link polarization switch (4); the horizontal polarization switch interface of the transmission link polarization switch (4) is connected to the horizontal polarization transmission port of the transmission feed source (5), and the vertical polarization switch interface of the transmission link polarization switch (4) is connected to the vertical polarization transmission port of the transmission feed source (5).

3. The RCS test system based on multi-channel parallel testing according to claim 2, characterized in that: The receiving link comprises a receiving feed source (6), a receiving link polarization switch (7) and a receiving modulation module (8); The horizontal polarization receiving port of the receiving feed source (6) is connected to the horizontal polarization switch interface of the receiving link polarization switch (7), and the vertical polarization receiving port of the receiving feed source (6) is connected to the vertical polarization switch interface of the receiving link polarization switch (7); the output end of the receiving link polarization switch (7) is connected to the input end of the receiving modulation module (8), and the output end of the receiving modulation module (8) is connected to the receiver interface of the vector network analyzer (2).

4. The RCS test system based on multi-channel parallel testing according to claim 3, characterized in that: The modulation pulse generator (9) is provided with a first modulation pulse output interface and a second modulation pulse output interface; The first modulation pulse output interface is connected to the control interface of the transmission modulation module (3), and the second modulation pulse output interface is connected to the control interface of the reception modulation module (8); The modulation pulse generator (9) is used to generate and send two modulation pulse signals; wherein the first modulation pulse signal is sent to the transmitting modulation module (3) through the first modulation pulse output interface, and the second modulation pulse signal is sent to the receiving modulation module (8) through the second modulation pulse output interface.

5. The RCS test system based on multi-channel parallel testing according to claim 1, characterized in that: Collect trigger signals that meet the following requirements: in, To test the timing controller (1) The delay of the acquisition trigger signal sent in each test channel; To test the timing controller (1) The delay of the acquisition trigger signal sent in each test channel; is the intermediate frequency bandwidth of the vector network analyzer (2).

6. The RCS test system based on multi-channel parallel testing according to claim 1, characterized in that: No. The test termination frequency of the test channel is The test start frequencies of the test channels are equal.

7. The RCS test system based on multi-channel parallel testing according to claim 1, characterized in that: The intermediate frequency bandwidth of the vector network analyzer (2) in each test channel satisfies: in, is the intermediate frequency bandwidth of the vector network analyzer (2); is the pulse repetition frequency of the modulated pulse signal.

8. The RCS test system based on multi-channel parallel testing according to claim 1, characterized in that: It also includes a motion controller (10); the in-position trigger output interface of the motion controller (10) is connected to the in-position trigger input interface of the test timing controller (1); wherein the motion controller (10) is used to generate and send an in-position trigger signal to the test timing controller (1).

9. An RCS test method based on multi-channel parallel testing, characterized in that: Utilize the RCS test system based on multi-channel parallel testing as described in any one of claims 1 to 8; Among them, the RCS test method based on multi-channel parallel testing includes: Using a vector network analyzer (2) to send a continuous wave radio frequency excitation signal to the transmission link; A test timing controller (1) is used to send a synchronization trigger signal to each test channel; wherein, when a modulation pulse generator (9) in each test channel receives the synchronization trigger signal, the delay of the modulation pulse signal is adjusted so that the delays of the modulation pulse signals in all test channels are aligned at a preset time; Pulse modulating the continuous wave radio frequency excitation signal using the modulated pulse signal to obtain and send the transmit radio frequency signal to free space; Using a receiving link to receive scattered radio frequency signals generated by the equipment under test; Pulse modulating the scattered radio frequency signal using a modulated pulse signal, obtaining and sending a received radio frequency signal to a vector network analyzer (2); A test timing controller (1) is used to send an acquisition trigger signal to each test channel, and after receiving the acquisition trigger signal, the vector network analyzer (2) starts to acquire echo signal data in the received radio frequency signal in the receiving link.

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