Automatic test system for low-intermediate-frequency radar receiving assembly and use method of automatic test system

Abstract

The invention belongs to the technical field of radar assembly automatic testing. The invention provides a low-intermediate frequency radar receiving assembly automatic test system and a use method thereof. According to the embodiment of the invention, the microwave excitation signal source is used as the signal source of the test system, the radio frequency signal is provided for the tested low-intermediate frequency radar receiving assembly, and the output signal outputs multiple paths of same signals through the power divider, and the signals are respectively accessed to the corresponding channels of the tested low-intermediate frequency radar receiving assembly. Down-conversion channel signals of a tested low-intermediate frequency radar receiving assembly are correspondingly connected to channels of an oscilloscope, and a control and signal processing module serves as a control system and a signal processing system of the whole system to control a microwave excitation source to generate signals and read signals of the oscilloscope. And calculating and processing to obtain various indexes of the tested low-intermediate frequency radar receiving assembly.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of automatic testing of radar components, and in particular, to an automatic testing system for a low- and intermediate-frequency radar receiving component and a method for using the same. Background Art

[0002] In the hardware system of modern radars, the receiving component is a key component of the radar system, and the performance of the receiving channel directly affects the performance indicators of the entire radar system.

[0003] With the rapid development of modern radars, the number of radar channels has been increasing continuously, the density has been increasing, and the number of channels of radar receiving components has also increased accordingly. The integration is higher, more complex, with more indicators, and the testing difficulty of receiving components has been rising continuously. Manual testing and measurement can no longer meet the production and debugging work of modern high-density radar receiving components. At present, a large number of testing tasks have gradually been transferred to automatic testing systems. The testing system can greatly improve the testing efficiency and accuracy, can comprehensively and quickly detect various performance indicators of the radar receiver, avoid omissions and errors that may occur in manual testing, and it can adapt to the testing requirements of different models of receivers, with strong versatility and flexibility, and is conducive to the integration and analysis management of test data, providing support for subsequent research and development. In addition, in the mass production link, the automatic testing system can also significantly reduce the labor cost and time cost, and improve the overall production efficiency. The radar receiving testing system is of great significance for promoting the development and application of radar technology.

[0004] Currently, various instruments are often used to build an automatic testing system for radar receivers to test the indicators of radar receiving components. However, the hardware and software structures of traditional component testing systems are complex, involving a large number of various measuring instruments, and special tooling is required. Usually, the construction time of a radar receiver testing system is very long.

[0005] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the embodiments of the present disclosure is to provide an automatic testing system for a low- and intermediate-frequency radar receiving component and a method for using the same, so as to at least overcome one or more problems caused by the limitations and defects of the related art to a certain extent.

[0008] According to the first aspect of the embodiments of the present disclosure, an automatic testing system for a low- and intermediate-frequency radar receiving component is provided. The system includes: A microwave excitation signal source for providing a radio frequency excitation signal to a low- and intermediate-frequency radar receiving component under test; A power divider, electrically connected to the microwave excitation signal source, evenly dividing the radio frequency excitation signal into several output signals and respectively inputting them to the corresponding channels of the low- and intermediate-frequency radar receiving component under test; An oscilloscope for collecting the intermediate-frequency time-domain signal output by the low- and intermediate-frequency radar receiving component under test; A control and signal processing module for controlling the signal output parameters of the microwave excitation signal source, reading and analyzing the intermediate-frequency time-domain signal collected by the oscilloscope.

[0009] Furthermore, the control and signal processing module further includes: A parameter control unit for controlling the signal output parameters of the microwave excitation signal source; A signal reading unit for reading the intermediate-frequency time-domain signal collected by the oscilloscope; A signal analysis unit for calculating the frequency-domain indexes of the low- and intermediate-frequency radar receiving component under test based on the intermediate-frequency time-domain signal by using a time-domain signal analysis algorithm and generating an analysis report; wherein, the frequency-domain indexes include receiving bandwidth, receiving gain, P -1 , noise level, sensitivity, limited amplitude dynamic range, receiver dynamic range, saturation output power, and phase consistency.

[0010] Furthermore, the control and signal processing module realizes index calculation through the following steps: Controlling the microwave excitation signal source to perform stepped frequency sweeping, recording the intermediate-frequency time-domain signal of the oscilloscope and converting it into an output power spectrum to calculate the receiving bandwidth and receiving gain; By adjusting the input power step and analyzing the non-linear change of the output power, determining P -1 and the receiver dynamic range; Controlling the opening and closing of the microwave excitation signal source to obtain the saturation output power and noise level; Based on the saturation output power and receiving gain, determining the sensitivity and limited amplitude dynamic range; Determining the phase consistency between channels through multi-channel time-domain phase difference analysis.

[0011] Furthermore, the output frequency range of the microwave excitation signal source is f0 ± 10 MHz, and the microwave excitation signal source performs stepped frequency sweeping at 1 MHz; wherein, f0 is the receiving center frequency of the receiving component.

[0012] Furthermore, the sampling rate of the oscilloscope is 4 GSa / s.

[0013] 6. The automatic test system for a low- and intermediate-frequency radar receiving component according to claim 6, wherein the power divider is a one-to-four power divider, and the oscilloscope is a four-trace oscilloscope.

[0014] 7. A method for using an automatic test system for a low- and medium-frequency radar receiving component, characterized in that the method includes: Connect a power divider and an oscilloscope to the input channel and the output channel of the low- and medium-frequency radar receiving component to be tested respectively; Set signal output parameters according to the control and signal processing module, and send a signal output instruction to the microwave excitation signal source; The microwave excitation signal source generates a radio frequency excitation signal according to the signal output instruction and sends it to the power divider; The power divider divides the radio frequency excitation signal into several output signals and inputs them into the low- and medium-frequency radar receiving component to be tested through the channels of the power divider; The oscilloscope collects the intermediate-frequency time-domain signal output by the low- and medium-frequency radar receiving component to be tested and sends the intermediate-frequency time-domain signal to the control and signal processing module; The control and signal processing module reads and analyzes the intermediate-frequency time-domain signal collected by the oscilloscope.

[0015] According to the second aspect of the embodiments of the present disclosure, a method for using an automatic test system for a low- and medium-frequency radar receiving component is provided. The method includes: The control and signal processing module controls the microwave excitation signal source to sweep the frequency step by step at 1 MHz from a first preset frequency to a second preset frequency at a fixed power , and simultaneously records the root mean square voltage value of the oscilloscope; Convert the root mean square voltage value of the oscilloscope into a first output power, and draw a curve of the output power versus the frequency to obtain the power spectrum of the receiver, so as to obtain the receiver bandwidth; wherein, (1) Wherein, is the first output power of the oscilloscope, is the root mean square voltage value of the oscilloscope; Further, the steps of receiver gain testing include: The receiver gain is characterized by the center frequency point, and the receiver gain is obtained from the result of the receiver bandwidth test ; wherein, is the fixed power; The steps of the test include: On the basis of the receiver gain test, keep the frequency unchanged, change the fixed power , increase it step by step by 1 dB each time, record the current output power according to formula (1) to obtain the current gain , when , the second output power is , and ; wherein, is the current output power, is the input power; The steps for testing the saturation output power include: Control the microwave excitation signal source to turn on the output, with the output power being -10 dBm, and read the current saturation output power from the oscilloscope ; The steps for testing the noise level include: Control the microwave excitation signal source to turn off the output, and make the waveform fill 70%-80% of the oscilloscope screen to obtain the best resolution and accuracy, and record the noise level at this time ; The steps for testing the sensitivity include: Based on the saturation output power test, record the noise power as by Equation (1), turn on the microwave excitation signal source, and the output power of the microwave excitation signal source is , record the output power , and the signal power can be obtained as , then the system signal-to-noise ratio is , and is obtained; The steps for testing the amplitude limit dynamic range include: The amplitude limit dynamic range is the dynamic range when the channel just reaches the saturation output power, and is obtained by calculation ; The steps for testing the dynamic range include: The dynamic range is the dynamic range when the channel just reaches , and is obtained by calculation ; The steps for testing the phase consistency include: Control the microwave excitation signal source to turn on the output, and use the oscilloscope to measure the phase difference between any channel and other channels simultaneously.

[0016] Furthermore, the microwave excitation signal source performs a step-by-step frequency sweep from f0 - 10 MHz to f0 + 10 MHz in steps of 1 MHz.

[0017] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: In the embodiments of the present disclosure, through the above-mentioned automatic test system for low- and intermediate-frequency radar receiving components and its usage method, on the one hand, the microwave excitation signal source is used as the signal source of the test system to provide radio frequency signals for the low- and intermediate-frequency radar receiving components to be tested. The output signal is output through a power splitter into multiple identical signals, which are respectively connected to the corresponding channels of the low- and intermediate-frequency radar receiving components to be tested. The channel signals down-converted by the low- and intermediate-frequency radar receiving components to be tested are respectively connected to the channels of the oscilloscope. The control and signal processing module serves as the control system and signal processing system of the entire system, controls the microwave excitation source to generate signals and reads the signals of the oscilloscope, and calculates and processes to obtain various indicators of the low- and intermediate-frequency radar receiving components to be tested. On the other hand, this system has a simple structure, uses fewer instruments, and has a fast measurement speed; it can calculate complete frequency-domain indicators through time-domain waveform data; it can measure the technical indicators of multiple receiving channels simultaneously without relying on an additional switch matrix; it is easy to maintain and has good interchangeability.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure and used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 Showing a schematic framework diagram of an automatic test system for a low- and intermediate-frequency radar receiving component in an exemplary embodiment of the present disclosure; Figure 2 Showing a step diagram of a usage method of an automatic test system for a low- and intermediate-frequency radar receiving component in an exemplary embodiment of the present disclosure; Figure 3 Showing a specific flowchart of the test of the automatic test system for a low- and intermediate-frequency radar receiving component in an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more comprehensive and complete and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0022] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0023] In this exemplary embodiment, a low IF radar receiving component automatic test system is first provided. As shown in Figure 1 , the system may include: A microwave excitation signal source for providing a radio frequency excitation signal to the low IF radar receiving component to be tested; A power divider electrically connected to the microwave excitation signal source, which divides the radio frequency excitation signal into several output signals and inputs them into the corresponding channels of the low IF radar receiving component to be tested respectively; An oscilloscope for collecting the intermediate frequency time domain signal output by the low IF radar receiving component to be tested; A control and signal processing module for controlling the signal output parameters of the microwave excitation signal source, reading and analyzing the intermediate frequency time domain signal collected by the oscilloscope.

[0024] Through the above low IF radar receiving component automatic test system, on the one hand, the microwave excitation signal source is used as the signal source of the test system to provide a radio frequency signal to the low IF radar receiving component to be tested. The output signal is output into multiple same signals through the power divider and is respectively connected to the corresponding channels of the low IF radar receiving component to be tested. The channel signals down-converted by the low IF radar receiving component to be tested are respectively connected to the channels of the oscilloscope. The control and signal processing module serves as the control system and signal processing system of the entire system, controls the microwave excitation source to generate signals and reads the signals of the oscilloscope, and calculates and processes to obtain various indicators of the low IF radar receiving component. On the other hand, the system has a simple structure, uses a small number of instruments, and has a fast measurement speed; it can calculate complete frequency domain indicators through time domain waveform data; it can measure the technical indicators of multiple receiving channels simultaneously without relying on an additional switch matrix; it is easy to maintain and has good interchangeability.

[0025] Next, each part of the above system in this exemplary embodiment will be described in more detail with reference to Figure 1 .

[0026] In one embodiment, the control and signal processing module further includes: A parameter control unit for controlling the signal output parameters of the microwave excitation signal source; A signal reading unit, configured to read the intermediate-frequency time-domain signal collected by an oscilloscope; A signal analysis unit, configured to calculate the frequency-domain indexes of the low-intermediate-frequency radar receiving component under test by using a time-domain signal analysis algorithm based on the intermediate-frequency time-domain signal, and generate an analysis report; wherein, the frequency-domain indexes include receiving bandwidth, receiving gain, P -1 , noise level, sensitivity, limited-amplitude dynamic range, receiver dynamic range, saturation output power, and phase consistency.

[0027] In one embodiment, the control and signal processing module implements index calculation through the following steps: Control the microwave excitation signal source to perform stepped frequency sweeping, record the intermediate-frequency time-domain signal of the oscilloscope and convert it into an output power spectrum to calculate the receiving bandwidth and receiving gain; Determine P -1 and the receiver dynamic range by adjusting the input power step and analyzing the non-linear change of the output power; Control the opening and closing of the microwave excitation signal source to obtain the saturation output power and the noise level; Determine the sensitivity and the limited-amplitude dynamic range based on the saturation output power and the receiving gain; Determine the phase consistency between channels through multi-channel time-domain phase difference analysis.

[0028] In a specific embodiment, the microwave excitation signal source serves as the signal source of the test system, provides a radio frequency signal for the receiving component under test, the output signal is output into four identical signals through a power divider, and is respectively connected to channel 1, channel 2, channel 3, and channel 4 of the receiving component. The four-channel signals down-converted by the receiving component are respectively connected to channel 1, channel 2, channel 3, and channel 4 of a four-trace oscilloscope. The PC serves as the control system and the signal processing system of the entire system, controls the microwave excitation source to generate signals and reads the signals of the oscilloscope, and calculates and processes to obtain the various indexes of the receiving component.

[0029] Regarding the device in the above embodiment, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated herein.

[0030] It should be noted that although several modules or units of a device for action execution are mentioned in the above detailed description, such division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units. The components shown as modules or units may or may not be physical units, that is, they may be located in one place, or may be distributed over multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the present disclosure. A person of ordinary skill in the art can understand and implement it without creative work.

[0031] Further, in the present exemplary embodiment, a method for using an automatic test system for a low intermediate frequency radar receiving component is also provided. Referring to Figure 2 shown in, this method may include: step S101 to step S106.

[0032] Step S101: Connect a power divider and an oscilloscope to the input channel and the output channel of the low intermediate frequency radar receiving component to be tested respectively; Step S102: Set signal output parameters according to the control and signal processing module, and send a signal output instruction to the microwave excitation signal source; Step S103: The microwave excitation signal source generates a radio frequency excitation signal according to the signal output instruction and sends it to the power divider; Step S104: The power divider evenly divides the radio frequency excitation signal into several output signals and inputs them into the low intermediate frequency radar receiving component to be tested through the channels of the power divider; Step S105: The oscilloscope collects the intermediate frequency time domain signal output by the low intermediate frequency radar receiving component to be tested and sends the intermediate frequency time domain signal to the control and signal processing module; Step S106: The control and signal processing module reads and analyzes the intermediate frequency time domain signal collected by the oscilloscope.

[0033] In a specific embodiment, as Figure 1 shown, it is a test block diagram of the automatic test system for the low intermediate frequency radar receiving component of the present application. Taking the test of a low intermediate frequency four-channel radar receiver with a radio frequency input frequency of 15750 MHz ± 10 MHz and an output intermediate frequency frequency of 150 MHz ± 10 MHz as an example, the specific implementation measures of the system of the present application are described. As Figure 3 shown, it is the specific flowchart of the test.

[0034] (1) Complete the physical connection according to the system block diagram shown in Figure 1 and measure the indexes of each channel receiver in sequence according to the order of (2)-(8).

[0035] (2) Receiver bandwidth test. The PC (i.e., the control and signal processing module) controls the signal source to sweep the frequency from 15725 MHz to 15775 MHz in 1 MHz steps at a fixed power (the input power when ensuring the linear output of the receiver), and simultaneously record the root mean square voltage value of the oscilloscope 、 ··· . For a 50-ohm microwave system, to conversion can be obtained from Equation (1), so the output power 、 ··· can be obtained. Plot the curve of output power versus frequency, and the power spectrum of the receiver at an output of 150 MHz ± 25 MHz can be obtained, thereby obtaining the receiver bandwidth BW. Among them, the expression of the output power is: (1) It can be understood that based on the receiver bandwidth test, a power spectrum composed of frequency vs output power within a ±25 MHz bandwidth can be obtained (the abscissa is frequency and the ordinate is power ). Starting from the maximum power point in the power spectrum, search sequentially to the left and right for the power points where the power is 3 dB lower than the maximum power point, and record the abscissas (frequencies) of the two power points. The frequency band formed by the two frequencies is the -3 dB receiver bandwidth BW. ).

[0036] (3) Receiver gain test. The receiver gain is characterized by the center frequency point, and the receiver gain can be obtained from the test results of step (2) .

[0037] (4) Test. On the basis of step (3), keep the frequency unchanged and change the power , increase it in 1 dB steps, record the current output power according to Equation (1), and the current gain can be obtained. When , the output power at this time is , . is the current output power, is the input power.

[0038] (5) Saturated output power test. Control the signal source to turn on the output, with the output power being -10 dBm, and read the current saturated output power from the oscilloscope .

[0039] ​(6) Noise level test: Turn off the output of the signal source, and adjust the waveform to fill 70%-80% of the screen to obtain the best resolution and accuracy. Record the noise level at this time. .

[0040] (7) Sensitivity test: Based on step (5), according to equation (1), record the noise power as , turn on the signal source, and the output power of the signal source (the input power when ensuring the linear output of the receiver), record the output power , then the signal power , and the system signal-to-noise ratio , and can be obtained.

[0041] (8) Limiting amplitude dynamic range: The limiting amplitude dynamic range is the dynamic range when the channel just reaches the saturated output power, which can be obtained by calculation .

[0042] (8) Dynamic range: The dynamic range is the dynamic range when the channel just reaches , which can be obtained by calculation .

[0043] (9) Phase consistency test: Turn on the output of the signal source, and use an oscilloscope to measure the phase differences of channels 2, 3, and 4 with respect to channel 1 simultaneously. Record , , .

[0044] (10) Complete the test and generate a test report.

[0045] In a specific embodiment, Table 1 lists the comparison between the solution of the present application and the solution of a certain test system. It can be seen from Table 1 that when the test of the receiving component is completed, the system used in the present application is more streamlined in terms of the type and quantity of instruments used, and the connection method is simpler. Although the software control method is equally complex, the control and interaction of the instruments in the present application are simpler, and the digital operation is a bit more complex than the traditional test system because the test data needs to be obtained through calculation. In terms of the test speed, since fewer instruments are used, the measurement speed is faster, and the overall construction difficulty is relatively low. The system built in the present application is also relatively inexpensive in terms of cost because the main test instrument used is still a more economical oscilloscope.

[0046] Table 1 Comparison between the test method of the system of the present application and the test method of a certain test system

[0047] With the above-mentioned automatic test system for low and intermediate frequency radar receiving components and its usage method, on the one hand, the microwave excitation signal source is used as the signal source of the test system to provide radio frequency signals for the low and intermediate frequency radar receiving components to be tested. The output signal is output through a power splitter into multiple identical signals, which are respectively connected to the corresponding channels of the low and intermediate frequency radar receiving components to be tested. The channel signals down-converted by the low and intermediate frequency radar receiving components to be tested are respectively connected to the channels of the oscilloscope. The control and signal processing module serves as the control system and signal processing system of the entire system, controls the microwave excitation source to generate signals and reads the signals of the oscilloscope, and calculates and processes to obtain various indicators of the low and intermediate frequency radar receiving components to be tested. On the other hand, this system has a simple structure, uses fewer instruments, and has a fast measurement speed; it can calculate complete frequency domain indicators through time domain waveform data; it can measure the technical indicators of multiple receiving channels simultaneously without relying on an additional switch matrix; it is easy to maintain and has good interchangeability.

[0048] It should be noted that although the steps of the methods in the present disclosure are described in a specific order in the drawings, this does not require or imply that these steps must be executed in that specific order, or that all the steps shown must be executed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be decomposed into multiple steps for execution, etc. Also, it is easily understood that these steps may be executed synchronously or asynchronously, for example, in multiple modules / processes / threads.

[0049] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. An automatic test system for a low- and medium-frequency radar receiving component, characterized in that, The system includes: A microwave excitation signal source for providing a radio frequency excitation signal to the low intermediate frequency radar receiving component to be tested; A power divider electrically connected to the microwave excitation signal source, which divides the radio frequency excitation signal into several output signals and inputs them into the corresponding channels of the low intermediate frequency radar receiving component to be tested respectively; An oscilloscope for collecting the intermediate frequency time domain signal output by the low intermediate frequency radar receiving component to be tested; A control and signal processing module for controlling the signal output parameters of the microwave excitation signal source, reading and analyzing the intermediate frequency time domain signal collected by the oscilloscope.

2. The automatic test system for the low and intermediate frequency radar receiving component according to claim 1, wherein The control and signal processing module further includes: A parameter control unit for controlling the signal output parameters of the microwave excitation signal source; A signal reading unit for reading the intermediate frequency time domain signal collected by the oscilloscope; A signal analysis unit, which is used to calculate the frequency-domain indexes of the low- and intermediate-frequency radar receiving component under test based on the intermediate-frequency time-domain signal by using the time-domain signal analysis algorithm, and generate an analysis report; wherein, the frequency-domain indexes include the receive bandwidth, receive gain, P -1 , noise level, sensitivity, limited amplitude dynamic range, receiver dynamic range, saturation output power, and phase consistency.

3. The automatic test system for the low and intermediate frequency radar receiving component according to claim 2, wherein The control and signal processing module calculates the indexes through the following steps: Controlling the microwave excitation signal source to perform step-by-step frequency sweeping, recording the intermediate frequency time domain signal of the oscilloscope and converting it into an output power spectrum to calculate the receiving bandwidth and receiving gain; By adjusting the input power step and analyzing the non-linear change of the output power, P -1 and the receiver dynamic range are determined; Controlling the opening and closing of the microwave excitation signal source to obtain the saturation output power and noise level; Based on the saturation output power and receiving gain, determining the sensitivity and limited amplitude dynamic range; Determining the phase consistency between channels through multi-channel time domain phase difference analysis.

4. The automatic test system for the low- and intermediate-frequency radar receiving component according to claim 1, wherein The output frequency range of the microwave excitation signal source is f0±10MHz, and the microwave excitation signal source performs step-by-step frequency sweeping at 1MHz; where f0 is the receiving center frequency point of the receiving component.

5. The automatic test system for a low- and medium-frequency radar receiving component according to claim 1, wherein The sampling rate of the oscilloscope is 4GSa / s.

6. The automatic test system for a low-IF radar receiving component according to claim 6, characterized in that, The power divider is a one-to-four power divider, and the oscilloscope is a four-trace oscilloscope.

7. A method for using an automatic test system for a low- and medium-frequency radar receiving component, characterized in that, The method includes: Connecting the power divider and the oscilloscope to the input end channel and output end channel of the low intermediate frequency radar receiving component to be tested respectively; Setting the signal output parameters according to the control and signal processing module and sending a signal output instruction to the microwave excitation signal source; The microwave excitation signal source generates a radio frequency excitation signal according to the signal output instruction and sends it to the power divider; The power divider divides the radio frequency excitation signal into several output signals and inputs them into the low intermediate frequency radar receiving component to be tested through the channels of the power divider; The oscilloscope collects the intermediate frequency time domain signal output by the low intermediate frequency radar receiving component to be tested and sends the intermediate frequency time domain signal to the control and signal processing module; The control and signal processing module reads and analyzes the intermediate frequency time domain signal collected by the oscilloscope.

8. The automatic test system for the low- and intermediate-frequency radar receiving component according to claim 7, wherein The steps of receiver bandwidth testing include: The control and signal processing module controls the microwave excitation signal source to sweep the frequency from the first preset frequency to the second preset frequency in steps of 1 MHz at a fixed power , and at the same time records the root mean square voltage value of the oscilloscope; Converting the root mean square voltage value of the oscilloscope into a first output power and plotting the curve of the output power versus frequency to obtain the power spectrum of the receiver, thereby obtaining the receiver bandwidth; where （1） Among them, is the first output power of the oscilloscope, is the root mean square voltage value of the oscilloscope; The steps of receiver gain testing include: The receiver gain is characterized by the center frequency point and obtained from the result of the receiver bandwidth test. Among them, is the fixed power. The steps of the test include: Keep the frequency unchanged based on the receiver gain test and change the fixed power , increase it in 1 dB steps, record the current output power according to Equation (1), and obtain the current gain , when , the second output power is , and ; where is the current output power, is the input power The steps of saturation output power testing include: Control the microwave excitation signal source to turn on the output with an output power of -10 dBm, and read the current saturation output power from the oscilloscope ; The steps of noise level testing include: Control the microwave excitation signal source to turn off the output, and make the waveform fill 70%-80% of the oscilloscope screen to obtain the best resolution and accuracy, and record the noise level at this time ; The steps of sensitivity testing include: Based on the saturated output power test, the noise power is denoted by Equation (1) as , turn on the microwave excitation signal source, and the output power of the microwave excitation signal source is , record the output power , the signal power can be obtained, then the system signal-to-noise ratio , and is obtained; The steps of limited amplitude dynamic range testing include: The limited amplitude dynamic range is the dynamic range when the channel just reaches the saturation output power and is obtained by calculation ; The steps of dynamic range testing include: The dynamic range is the dynamic range when the channel just reaches and is obtained by calculation ; The steps of phase consistency testing include: Controlling the microwave excitation signal source to turn on the output, and using the oscilloscope to simultaneously measure the phase difference between any channel and other channels.

9. The automatic test system for a low-IF radar receiving component according to claim 8, characterized in that, The microwave excitation signal source performs step-by-step frequency sweeping from f0 - 10MHz to f0 + 10MHz at 1MHz.

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