Radar data acquisition method, device and system

Abstract

The present invention provides a radar data acquisition method, device and system, the method comprising: receiving a radar sampling request; obtaining the receiver dynamic range and the number of sampling bits of the radar according to the radar sampling request, and determining the step of the attenuator; the step of the attenuator is less than the ratio of the receiver dynamic range to the number of sampling bits; determining the preset attenuation range of the attenuator according to the step and the resolution of the radar; wherein the preset attenuation range includes several attenuation values, and the extreme value of the preset attenuation range is equal to the resolution of the radar; based on the attenuator scanning mode from low to high according to the attenuation value within the preset attenuation range, the radar is used to perform an RCS test on the target to be sampled, complete the attenuation cycle test, and obtain the target echo signal. The radar data acquisition method provided by this scheme can improve the sampling accuracy of radars with fewer ADC sampling bits without changing the original radar structure.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electromagnetic scattering technology, and in particular to a radar data acquisition method, device and system. Background Art

[0002] Radars are now widely used in real-life scenarios, such as automotive radars, maritime radars, civil aircraft radars, etc. However, the main difference between these radars and electromagnetic scattering test radars is that the former operate in a specific frequency band, have a narrow bandwidth, and have a small number of ADC sampling bits and low sampling accuracy, which in turn affects the radar test results.

[0003] Therefore, there is an urgent need for a radar data acquisition method to improve the sampling accuracy of radars with a small ADC sampling bit number. Summary of the invention

[0004] The embodiments of the present invention provide a radar data acquisition method, device and system. The radar data acquisition method can improve the sampling accuracy of a radar with a small ADC sampling bit number without changing the original radar structure.

[0005] In a first aspect, an embodiment of the present invention provides a radar data collection method, including:

[0006] receiving radar sampling requests;

[0007] Acquire the receiver dynamic range and the number of sampling bits of the radar according to the radar sampling request, and determine the step of the attenuator; the step of the attenuator is smaller than the ratio of the receiver dynamic range to the number of sampling bits;

[0008] Determine a preset attenuation range of the attenuator according to the step and the resolution of the radar; wherein the preset attenuation range includes a plurality of attenuation values, and the range value of the preset attenuation range is equal to the resolution of the radar;

[0009] Based on the scanning mode of the attenuator from low to high attenuation value within the preset attenuation range, the radar is used to perform RCS test on the target to be sampled, complete the attenuation cycle test, and obtain the target echo signal.

[0010] Optionally, before performing an RCS test on a target to be sampled by using the radar in a scanning mode based on the attenuator in the preset attenuation range according to the attenuation value from low to high, and after receiving the radar sampling request, the method further includes:

[0011] The radar is subjected to a calibration test; wherein the calibration test includes ground calibration and air calibration.

[0012] Optionally, the preset attenuation range is [0, Ns], wherein N is used to characterize the number of non-zero attenuation values ​​in the preset attenuation range, and s is used to characterize the step of the attenuator.

[0013] Optionally, Ns is used to characterize the resolution of the radar.

[0014] Optionally, the difference between adjacent attenuation values ​​in the preset attenuation range is the step.

[0015] Optionally, the sampling bit number of the radar is less than 12 bits.

[0016] Optionally, the attenuator performs a scanning mode from low to high attenuation value within the preset attenuation range, performs an RCS test on the target to be sampled by using the radar, completes an attenuation cycle test, and obtains a target echo signal, including:

[0017] When the attenuation value is 0, the radar is used to perform an RCS test on the target to be sampled to obtain an initial echo signal;

[0018] Assigning the attenuation value of the attenuator to a first attenuation value, and using the radar to perform an RCS test on the target to be sampled to obtain a test echo signal; wherein the current number of assignments is recorded as n, and the first attenuation value is the product of the current number of assignments and the step;

[0019] Determining whether the initial echo signal is greater than the test echo signal;

[0020] If the judgment result is no, the number of assignments is determined to be n+1, and the process returns to execute the assignment of the attenuation value of the attenuator to the first attenuation value, and the current number of assignments is updated to n+1;

[0021] If the judgment result is yes, the attenuation period test is completed to obtain the target echo signal.

[0022] Optionally, obtaining the target echo signal includes:

[0023] When the initial echo signal is greater than the test echo signal, obtaining a first attenuation value of the current attenuator as a target attenuation value;

[0024] A sum operation is performed on the target attenuation value and the test echo signal to obtain the target echo signal.

[0025] Optionally, in the attenuation cycle test, the electromagnetic scattering characteristics of the target to be sampled remain unchanged.

[0026] In a second aspect, an embodiment of the present invention further provides a radar data acquisition device, including:

[0027] A receiving module, used for receiving a radar sampling request;

[0028] A determination module, configured to obtain a receiver dynamic range and a sampling bit number of the radar according to the radar sampling request, and determine a step of an attenuator; and determine a preset attenuation range of the attenuator according to the step and a resolution of the radar; wherein the preset attenuation range includes a plurality of attenuation values, and a range value of the preset attenuation range is equal to the resolution of the radar;

[0029] The processing module is used to perform an RCS test on the target to be sampled by using a radar in a scanning mode of an attenuation value from low to high within the preset attenuation range, complete an attenuation cycle test, and obtain a target echo signal.

[0030] In a third aspect, an embodiment of the present invention further provides a radar data acquisition system, comprising: a radar, an attenuator, and the radar data acquisition device described in the second aspect above;

[0031] The radar is used to perform RCS testing on the target to be sampled;

[0032] The attenuator is used to perform RCS test on the target to be sampled by using radar in a scanning mode from low to high attenuation value within a preset attenuation range to complete the attenuation cycle test.

[0033] In a fourth aspect, an embodiment of the present invention further provides a computing device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the radar data collection method described in any one of the above items is implemented.

[0034] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed in a computer, the computer is enabled to execute any of the radar data acquisition methods described above.

[0035] The embodiment of the present invention provides a radar data acquisition method, device and system. The method adds an attenuator to the radar data acquisition system, and selects an attenuator with a step smaller than the ratio of the receiver dynamic range to the number of sampling bits, so as to ensure that the attenuator has a higher accuracy than the radar, and then determines a preset attenuation range based on the resolution and step of the radar, and then adopts an automatic scanning mode in which the attenuation value is from low to high within the preset attenuation range, and uses the radar to complete the attenuation cycle test of the target to be sampled, and then obtains the target echo signal of the target to be sampled based on the attenuator. In this way, the received target echo signal has the accuracy of the attenuator, and the sampling accuracy of the existing radar with a low sampling bit number is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a flow chart of a radar data collection method provided by one embodiment of the present invention;

[0038] Figure 2 It is a flow chart of a method for obtaining a target echo signal based on an attenuation period test provided by an embodiment of the present invention;

[0039] Figure 3 is a hardware architecture diagram of a computing device provided by an embodiment of the present invention;

[0040] Figure 4 is a structural diagram of a radar data acquisition device provided by one embodiment of the present invention;

[0041] Figure 5 It is a structural diagram of a radar data acquisition system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] As described in the background technology, radars have been widely used in existing life scenarios, but such radar systems have low sampling accuracy due to the small number of ADC sampling bits. Therefore, the present invention considers improving the sampling accuracy through limited modification, without changing the basic structure of the original radar, through system control and data processing. In view of this, by adding a high-precision attenuator, a test system with a low ADC sampling bit and a high attenuator bit is combined, thereby improving the accuracy of the sampled data with the help of the accuracy of the attenuator.

[0044] The above is the concept provided by the present invention. The specific implementation method of the concept provided by the present invention is described below.

[0045] Please refer to Figure 1 , an embodiment of the present invention provides a radar data collection method, the method comprising:

[0046] Step 100, receiving a radar sampling request;

[0047] Step 102, obtaining the receiver dynamic range and the sampling bit number of the radar according to the radar sampling request, and determining the step of the attenuator; the step of the attenuator is smaller than the ratio of the receiver dynamic range to the sampling bit number;

[0048] Step 104, determining a preset attenuation range of the attenuator according to the step size and the resolution of the radar; wherein the preset attenuation range includes a plurality of attenuation values, and the range value of the preset attenuation range is equal to the resolution of the radar;

[0049] Step 106, based on the attenuator scanning mode from low to high attenuation value within the preset attenuation range, the radar is used to perform an RCS test on the target to be sampled, complete the attenuation cycle test, and obtain the target echo signal.

[0050] In the embodiment of the present invention, by adding an attenuator to the radar data acquisition system and selecting an attenuator whose step is smaller than the ratio of the receiver dynamic range to the number of sampling bits, it is ensured that the attenuator has a higher accuracy than the radar, and then the preset attenuation range is determined based on the resolution and step of the radar, and then the attenuation value is automatically scanned from low to high within the preset attenuation range, and the radar is used to complete the attenuation cycle test of the target to be sampled, and then the target echo signal of the target to be sampled is obtained based on the attenuator. In this way, the resolution of the radar can be further refined with the help of the step of the attenuator, so that the received target echo signal has the accuracy of the attenuator, and the sampling accuracy of the existing radar with a low number of sampling bits is improved.

[0051] Described below Figure 1 How the various steps are performed.

[0052] First, with respect to step 100 , a radar sampling request may be sent by a server or a computer terminal in communication with the radar.

[0053] With respect to step 102 , the receiver dynamic range and the sampling bit number of the radar are obtained according to the radar sampling request, and the stepping of the attenuator is determined.

[0054] Specifically, the sampling bit number of the radar is less than 12 bits, and the sampling accuracy is low. A high-precision attenuator with a step smaller than the ratio of the receiver dynamic range to the sampling bit number is selected to ensure that the accuracy of the data collected based on the attenuator is higher than the sampling accuracy of the current radar.

[0055] In the present invention, the sampling bit number of the existing radar used is relatively low, generally less than 12 bits, and has a high cost performance. Specifically, a radar with a scanning mode can be used to continuously scan the target area through a mechanical rotating structure to obtain a time history diagram of the target area echo. Ordinary irradiation radar can also be used. By adding an optoelectronic coaxial video monitoring device and a servo structure, the target to be sampled is always within the irradiation range of the radar antenna main lobe, and a time history diagram of a one-dimensional range image is obtained; a curve of the target echo intensity changing with time is extracted through data processing. If the target area is flat, open, and has no strong clutter scattering source, the maximum value of the target area echo can be directly extracted as the target echo intensity. For the attenuator, the attenuation value can be electrically switched through a hardware control circuit.

[0056] In step 104, a preset attenuation range of the attenuator is determined according to the step size and the resolution of the radar.

[0057] Specifically, the preset attenuation range is [0, Ns], which includes several attenuation values, N is used to represent the number of non-zero attenuation values ​​in the preset attenuation range, s is used to represent the step of the attenuator, and the extreme value of the preset attenuation range is equal to the resolution of the radar. The value of Ns is equal to the resolution of the radar; the difference between adjacent attenuation values ​​in the preset attenuation range is the step.

[0058] For example, the resolution of existing civilian radars is 1dB, and the step of the attenuator used is 0.1dB, then Ns=1dB, where s=0.1dB, N=10; the preset attenuation range is [0, 1dB], including 0dB, 0.1dB, 0.2dB, 0.3dB, 0.4dB, 0.5dB, 0.6dB, 0.7dB, 0.8dB, 0.9dB, and 1dB, a total of 11 attenuation values.

[0059] After step 100 and before step 106, the method further includes: performing a calibration test on the radar.

[0060] Specifically, the calibration test includes ground calibration and aerial calibration.

[0061] In the present invention, the test system calibration generally adopts external calibration, by testing the standard calibration body and comparing it with the theoretical value of the standard calibration body, calibrating the target echo signal and obtaining the target electromagnetic scattering characteristics. In practical applications, ground calibration and air calibration can be adopted according to the type of target to be sampled and the test scene.

[0062] For ground calibration, the 12dB gain of the ground relative to the free space field is obtained by synthesizing the field strength of the first echo and the second echo. The geometric position relationship formula between the radar antenna and the target to be sampled is as follows: where h a is the radar antenna height, h tis the height of the standard calibration body, λ is the wavelength, and R is the ground distance between the radar and the target to be sampled. For aerial calibration, a balloon or drone is used to carry the standard calibration body and hover in the air to simulate illumination in free space and calibrate the radar system.

[0063] After step 100 and before step 106, the process further includes: deploying and preheating the radar near the target area to be sampled, determining the test distance and the fixed attenuation of the receiving end based on the approximate magnitude of the target and the radar system, and ensuring that the target echo is always within the dynamic range of the radar receiver and has a sufficient signal-to-noise ratio. For dynamic testing of cooperative targets, a satellite / inertial navigation device can be installed on the target in advance to obtain the target's longitude, latitude, altitude, heading, pitch, roll and other position and attitude parameters.

[0064] With respect to step 106 , based on the scanning mode of the attenuator from low to high attenuation value within the preset attenuation range, the radar is used to perform an RCS test on the target to be sampled, complete the attenuation cycle test, and obtain the target echo signal.

[0065] Specifically, in a decay cycle test, the electromagnetic scattering characteristics of the target to be sampled remain unchanged, so that the echo signal of the target to be sampled is stable and the target echo signal obtained by the test is effective and accurate. That is, the time of a decay cycle test process should be much shorter than the time of change of the target electromagnetic scattering characteristics, so as to ensure the stability of the target test echo during the test process and improve the echo accuracy. In the case where the target test echo is much higher than the noise, in a decay cycle test process, it can be considered that the jump of the radar receiver is caused by the electronically controlled high-precision attenuator.

[0066] like Figure 2 As shown, step 106 includes the following sub-steps:

[0067] Step S1: When the attenuation value is 0, the radar is used to perform an RCS test on the target to be sampled to obtain an initial echo signal;

[0068] Step S2: assigning the attenuation value to the first attenuation value, and performing RCS test on the target to be sampled by radar to obtain a test echo signal; wherein the current number of assignments is recorded as n, and the first attenuation value is the product of the current number of assignments and the step;

[0069] Step S3: Determine whether the initial echo signal is greater than the test echo signal; if the determination result is no, execute step S4, otherwise execute step S5;

[0070] Step S4: Determine that the number of assignments is n+1, return to execute step S2, and update the current number of assignments to n+1;

[0071] Step S5: determining that the attenuation cycle test is completed;

[0072] Step S6: obtaining the first attenuation value of the current attenuator as the target attenuation value; performing a sum operation on the target attenuation value and the test echo signal to obtain the target echo signal.

[0073] It should be noted that when the attenuation value is assigned for the first time, n is preferably 1; and in the entire attenuation cycle test, 1<n+1≤N.

[0074] For example, as described in the previous example, the attenuation cycle test includes: when the attenuation value is set to 0, the radar is used to perform an RCS test on the target to be sampled to obtain the initial echo signal S T0 ; Assign the attenuation value to 0.1dB, record the current assignment number as 1, and obtain the test echo signal S through RCS test T1 ; Determined by judgment S T0 =S T1 , it is considered that the attenuator attenuation has not reduced the echo signal to the radar receiver decision threshold, and the number of assignments is determined to be 2; return to continue to assign the attenuation value, record the current number of assignments as 2, assign the attenuation value to 0.2dB, and obtain the test echo signal S through RCS test T2 ; Determined by judgment S T0 >S T2 , it is considered that the attenuator attenuation has not reduced the echo signal to the radar receiver decision threshold, and it is determined that one attenuation cycle test is completed. At this time, the target echo signal S T =S T2 +0.2dB.

[0075] It should be noted that an attenuation cycle test is required for each observation angle in a sampling request. When the observation angle is changed, a new round of attenuation cycle test needs to be restarted. This can further improve the accuracy of data collected at different observation angles.

[0076] In the present invention, after determining the preset attenuation range of the attenuator by stepping and the resolution of the radar, it is possible to continuously scan from low to high according to the attenuation value based on the automatic scanning mode of the attenuator, thereby achieving high-precision processing of the echo signal and obtaining a target echo signal with high precision.

[0077] like Figure 3 , Figure 4 As shown, an embodiment of the present invention provides a radar data acquisition device. The device embodiment can be implemented by software, or by hardware or a combination of software and hardware. From the hardware level, Figure 3 As shown in FIG. 1 , a hardware architecture diagram of a computing device in which a radar data acquisition device provided by an embodiment of the present invention is located is shown in FIG. Figure 3In addition to the processor, memory, network interface, and non-volatile memory shown in the embodiment, the computing device where the device is located may also generally include other hardware, such as a forwarding chip responsible for processing messages, etc. Taking software implementation as an example, Figure 4 As shown, as a device in a logical sense, the CPU of the computing device in which it is located reads the corresponding computer program in the non-volatile memory into the memory and runs it. A radar data acquisition device provided in this embodiment includes: a receiving module 400, a determining module 402 and a processing module 404;

[0078] The receiving module 400 is used to receive a radar sampling request;

[0079] The determination module 402 is used to obtain the receiver dynamic range and the sampling bit number of the radar according to the radar sampling request, and determine the step of the attenuator; and determine the preset attenuation range of the attenuator according to the step and the resolution of the radar; wherein the preset attenuation range includes a plurality of attenuation values, and the range value of the preset attenuation range is equal to the resolution of the radar;

[0080] The processing module 404 is used to perform an RCS test on the target to be sampled by using the radar in a preset attenuation range according to a scanning mode of attenuation values ​​from low to high, complete an attenuation cycle test, and obtain a target echo signal.

[0081] In some specific implementations, the receiving module 400 may be used to execute the above step 100 , the determining module 402 may be used to execute the above steps 102 and 104 , and the processing module 406 may be used to execute the above step 106 .

[0082] In some specific implementations, the determination module 402 is used to determine that the preset attenuation range is [0, Ns]; wherein N is used to characterize the number of non-zero attenuation values ​​in the preset attenuation range, s is used to characterize the step of the attenuator; and Ns is used to characterize the resolution of the radar;

[0083] The difference between adjacent attenuation values ​​in the preset attenuation range is a step.

[0084] In some specific implementations, the sampling bit number of the radar is less than 12 bits.

[0085] In some specific implementations, the processing module 406 is further configured to perform the following operations:

[0086] When the attenuation value is 0, the radar is used to perform RCS test on the target to be sampled to obtain the initial echo signal;

[0087] Assign the attenuation value of the attenuator to a first attenuation value, and use the radar to perform an RCS test on the target to be sampled to obtain a test echo signal; wherein the current assignment number is recorded as n, and the first attenuation value is the product of the current assignment number and the step;

[0088] Determine whether the initial echo signal is greater than the test echo signal;

[0089] If the judgment result is no, the number of assignments is determined to be n+1, and the execution is returned to assign the attenuation value of the attenuator to the first attenuation value, and the current number of assignments is updated to n+1;

[0090] If the judgment result is yes, the attenuation cycle test is completed and the target echo signal is obtained.

[0091] In some specific implementations, the processing module 406 is further configured to perform the following operations:

[0092] When the initial echo signal is greater than the test echo signal, obtaining a first attenuation value of the current attenuator as a target attenuation value;

[0093] The target attenuation value and the test echo signal are summed to obtain the target echo signal.

[0094] like Figure 5 As shown, an embodiment of the present invention provides a radar data acquisition system, including: a radar 501, an attenuator 502 and a radar data acquisition device 503;

[0095] Radar 501, used to perform RCS test on the target to be sampled;

[0096] The attenuator 502 is used to perform RCS test on the target to be sampled by using the radar 501 in a scanning mode from low to high attenuation value within a preset attenuation range to complete the attenuation cycle test;

[0097] The radar data acquisition device 503 is used to obtain the target echo signal according to the attenuation period test.

[0098] In some specific implementations, the radar is also used to perform calibration tests; the calibration tests include ground calibration and air calibration.

[0099] It is to be understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on a radar data acquisition device and system. In other embodiments of the present invention, a radar data acquisition device and system may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0100] The information interaction, execution process and other contents between the modules in the above-mentioned devices and systems are based on the same concept as the embodiments of the method of the present invention. For specific contents, please refer to the description in the embodiments of the method of the present invention, and will not be repeated here.

[0101] An embodiment of the present invention further provides a computing device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, a radar data collection method in any embodiment of the present invention is implemented.

[0102] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the processor executes a radar data collection method in any embodiment of the present invention.

[0103] Specifically, a system or device equipped with a storage medium can be provided, on which software program code that implements the functions of any of the above-mentioned embodiments is stored, and a computer (or CPU or MPU) of the system or device can be enabled to read and execute the program code stored in the storage medium.

[0104] In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.

[0105] The storage medium embodiments for providing the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), a magnetic tape, a non-volatile memory card, and a ROM. Alternatively, the program code can be downloaded from a server computer by a communication network.

[0106] In addition, it should be clear that the functions of any of the above embodiments can be implemented not only by executing the program code read by the computer, but also by enabling an operating system operating on the computer to complete part or all of the actual operations based on instructions from the program code.

[0107] In addition, it can be understood that the program code read from the storage medium is written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion module connected to the computer, and then based on the instructions of the program code, a CPU installed on the expansion board or expansion module is enabled to perform part or all of the actual operations, thereby realizing the functions of any of the above-mentioned embodiments.

[0108] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical factors in the process, method, article or device including the elements.

[0109] A person of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., various media that can store program codes.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. 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 embodiments of the present invention.

Claims

1. A radar data collection method, characterized in that: include: receiving radar sampling requests; Acquire the radar receiver dynamic range and sampling bit number according to the radar sampling request, and determine the step of the attenuator; The step size of the attenuator is smaller than the ratio of the receiver dynamic range to the number of sampling bits; Determine a preset attenuation range of the attenuator according to the step and the resolution of the radar; wherein the preset attenuation range includes a plurality of attenuation values, and the range value of the preset attenuation range is equal to the resolution of the radar; Based on the scanning mode of the attenuator from low to high attenuation value within the preset attenuation range, the radar is used to perform RCS test on the target to be sampled, complete the attenuation cycle test, and obtain the target echo signal.

2. The method according to claim 1, characterized in that Before performing RCS test on the target to be sampled by using the radar in the scanning mode based on the attenuator in the preset attenuation range according to the attenuation value from low to high, and after receiving the radar sampling request, the method further includes: The radar is subjected to a calibration test; wherein the calibration test includes ground calibration and air calibration.

3. The method according to claim 1, characterized in that The preset attenuation range is [0, Ns]; wherein N is used to represent the number of non-zero attenuation values ​​in the preset attenuation range, and s is used to represent the step of the attenuator; and / or, The difference between adjacent attenuation values ​​in the preset attenuation range is the step; and / or, The sampling bit number of the radar is less than 12 bits.

4. The method according to claim 1, characterized in that: The attenuator performs a scanning mode from low to high attenuation value within the preset attenuation range, performs an RCS test on the target to be sampled by using the radar, completes the attenuation cycle test, and obtains the target echo signal, including: When the attenuation value is 0, the radar is used to perform an RCS test on the target to be sampled to obtain an initial echo signal; Assigning the attenuation value of the attenuator to a first attenuation value, and using the radar to perform an RCS test on the target to be sampled to obtain a test echo signal; wherein the current number of assignments is recorded as n, and the first attenuation value is the product of the current number of assignments and the step; Determining whether the initial echo signal is greater than the test echo signal; If the judgment result is no, the number of assignments is determined to be n+1, and the process returns to execute the assignment of the attenuation value of the attenuator to the first attenuation value, and the current number of assignments is updated to n+1; If the judgment result is yes, the attenuation period test is completed to obtain the target echo signal.

5. The method according to claim 4, characterized in that The step of obtaining the target echo signal comprises: When the initial echo signal is greater than the test echo signal, obtaining a first attenuation value of the current attenuator as a target attenuation value; A sum operation is performed on the target attenuation value and the test echo signal to obtain the target echo signal.

6. The method according to any one of claims 1 to 5, characterized in that: In the attenuation cycle test, the electromagnetic scattering characteristics of the target to be sampled remain unchanged.

7. A radar data acquisition device, characterized in that: include: A receiving module, used for receiving a radar sampling request; A determination module, used to obtain the receiver dynamic range and the sampling bit number of the radar according to the radar sampling request, and determine the step of the attenuator; and determining a preset attenuation range of the attenuator according to the step and the resolution of the radar; wherein the preset attenuation range includes a plurality of attenuation values, and the range value of the preset attenuation range is equal to the resolution of the radar; The processing module is used to perform an RCS test on the target to be sampled by using the radar in a scanning mode with an attenuation value from low to high within the preset attenuation range, complete an attenuation cycle test, and obtain a target echo signal.

8. A radar data acquisition system, characterized in that: include: A radar, an attenuator and a radar data acquisition device as claimed in claim 7; The radar is used to perform RCS testing on the target to be sampled; The attenuator is used to perform RCS test on the target to be sampled by using radar in a scanning mode from low to high attenuation value within a preset attenuation range to complete the attenuation cycle test.

9. A computing device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute the method according to any one of claims 1 to 6.

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