Interference suppression method and system based on segmented pulse pressure and uniformity measurement

Abstract

The invention provides an interference suppression method and system based on segmented pulse pressure and uniformity measurement, and relates to the technical field of radar signal interference suppression. The method comprises the following steps: segmenting an obtained echo signal into a plurality of sub-pulse segments; performing pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; the maximum value of the pulse compression peak values of the multiple sub-pulse segments serves as the maximum test threshold value of the test range, and the optimal threshold value is determined by calculating the signal uniformity index of each sub-pulse segment for each test threshold value; and according to the optimal threshold value and the pulse compression peak value of each sub-pulse segment, eliminating the interfered sub-pulse segments to obtain an echo signal after interference suppression. According to the method, the interfered sub-pulse segments can be effectively eliminated, so that the suppression effect on interference signals is realized, and the accuracy and reliability of target detection of echo signals are further improved.

Description

Technical Field

[0001] The present specification relates to the technical field of radar signal interference suppression, and in particular to an interference suppression method and system based on segmented pulse pressure and uniformity measurement. Background Art

[0002] Radar systems are widely used in modern military, meteorological observation, aerospace and other fields. However, in practical applications, radars are often affected by various interference factors, such as electromagnetic interference and multipath effects, which lead to signal quality degradation and affect the accuracy of target detection and recognition. Traditional interference removal methods often rely on fixed threshold settings and are difficult to adapt to complex and changing interference environments. Summary of the invention

[0003] The purpose of this specification is to provide an interference suppression method based on segmented pulse pressure and uniformity measurement, which can solve the problem that traditional interference suppression methods are difficult to adapt to complex and changeable interference environments.

[0004] The embodiments of this specification are implemented as follows: On the one hand, this specification provides an interference suppression method based on segmented pulse pressure and uniformity measurement, mainly including: Segmenting the acquired echo signal into a plurality of sub-pulse segments; Performing pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; The maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments is used as the maximum test threshold value of the test range, and the optimal threshold value is determined by calculating the signal uniformity index of each sub-pulse segment for each test threshold value, wherein the test range includes a plurality of test threshold values ​​with a preset step value as an interval from 0 to the maximum test threshold value; According to the optimal threshold and the pulse compression peak value of each sub-pulse segment, the sub-pulse segment affected by interference is eliminated to obtain an echo signal after interference suppression.

[0005] On the other hand, the present specification provides an interference suppression system based on segmented pulse pressure and uniformity measurement, mainly comprising: A segmentation module, used for segmenting the acquired echo signal into a plurality of sub-pulse segments; A pulse compression module, used for performing pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; A determination module, configured to use the maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments as the maximum test threshold value of the test range, and determine the optimal threshold value by calculating the signal uniformity index of each of the sub-pulse segments for each of the test threshold values, wherein the test threshold value includes a plurality of test threshold values ​​with a preset step value as an interval from 0 to the maximum test threshold value; The elimination module is used to eliminate the sub-pulse segments affected by interference according to the optimal threshold and the pulse compression peak value of each sub-pulse segment to obtain the echo signal after interference suppression.

[0006] The embodiments of this specification have at least the following advantages or beneficial effects: The radar signal interference suppression method can effectively reduce the attenuation and distortion of long pulse signals during propagation by segmenting the original echo signal into multiple sub-pulse segments and independently performing pulse compression processing on each sub-pulse segment. At the same time, it can effectively improve the flexibility and accuracy of signal processing by performing more precise signal analysis on each sub-pulse segment. The pulse compression peak value of each sub-pulse segment is used as the maximum test threshold to determine the optimal threshold for the best signal uniformity, which can effectively eliminate the interfered sub-pulse segments, thereby achieving the suppression effect on the interference signal, thereby improving the accuracy and reliability of target detection by the echo signal, and at the same time being able to adapt to complex and changeable interference environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present specification and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0008] Figure 1 A flow chart of the interference suppression method based on segmented pulse pressure and uniformity measurement provided in this specification; Figure 2 The time-frequency diagram of the radar echo signal provided for this manual without interference signals; Figure 3 The time-frequency diagram of the radar reference signal provided for this manual; Figure 4 The time-frequency diagram of the radar echo signal including the interference signal provided for this manual; Figure 5 The time-frequency diagram of the interference signal provided for this manual; Figure 6 A schematic diagram of the pulse compression result of the first sub-pulse segment provided in this specification; Figure 7 A schematic diagram of the pulse compression result of the second sub-pulse segment provided in this specification; Figure 8 This is a schematic diagram of the result after summing up the pulse pressure results of each sub-pulse segment provided in this manual; Fig. 9 This is a schematic diagram of the result of summing the pulse pressure results of the sub-pulse segments after interference is eliminated provided in this specification; Fig.10 A schematic diagram of a radar signal interference suppression system based on segmented pulse pressure and uniformity measurement method provided in this specification. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solutions and advantages of the embodiments of this specification more clear, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are part of the embodiments of this specification, not all of the embodiments. Generally, the components of the embodiments of this specification described and shown in the drawings here can be arranged and designed in various different configurations.

[0010] Please refer to Figure 1 An embodiment of the present specification provides an interference suppression method based on segmented pulse pressure and uniformity measurement, which mainly includes: Step 102, segmenting the acquired echo signal into a plurality of sub-pulse segments; Step 104, performing pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; Step 106, taking the maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments as the maximum test threshold value of the test range, and determining the optimal threshold value by calculating the signal uniformity index of each sub-pulse segment for each test threshold value, wherein the test range includes a plurality of test threshold values ​​spaced from 0 to the maximum test threshold value with a preset step value; Step 108: according to the optimal threshold and the pulse compression peak value of each sub-pulse segment, the sub-pulse segment affected by interference is eliminated to obtain an echo signal after interference suppression.

[0011] Specifically, the above method can effectively reduce the attenuation and distortion of long pulse signals during propagation by segmenting the original echo signal into multiple sub-pulse segments and performing pulse compression processing on each sub-pulse segment independently. At the same time, it can effectively improve the flexibility and accuracy of signal processing by performing more detailed signal analysis on each sub-pulse segment. The pulse compression peak value of each sub-pulse segment is used as the maximum test threshold to determine the optimal threshold for optimal signal uniformity. The interfered sub-pulse segments can be effectively eliminated, thereby suppressing the interference signals and further improving the accuracy and reliability of target detection by the echo signal.

[0012] In this embodiment, one implementation of step 106 is as follows: Step 112, dividing each of the sub-pulse segments into a first part signal and a second part signal based on the test threshold; Step 114, respectively calculating uniformity indexes of the first part of the signal and the second part of the signal; Step 116: Take the test threshold corresponding to the minimum uniformity index as the optimal threshold.

[0013] In this embodiment, the above method can more accurately determine the optimal threshold with better signal uniformity, thereby effectively improving the interference signal suppression effect.

[0014] In this embodiment, one implementation of step 114 is as follows: Step 122, calculating the mean of the first part of the signal and the mean of the second part of the signal; Step 124: Calculate the variance of the first signal portion and the variance of the second signal portion according to the mean of the first signal portion and the mean of the second signal portion; Step 126, calculating the quantity ratio of the first part of the signal and the second part of the signal in the pulse segment to which they belong; Step 128: Calculate a uniformity metric according to the variance of the first signal portion, the variance of the second signal portion, and the ratio of the number of the first signal portion to the number of the second signal portion.

[0015] In this embodiment, the first partial signal is a sub-pulse segment signal greater than or equal to the test threshold, and the second partial signal is a sub-pulse segment signal less than the test threshold.

[0016] In this embodiment, the above steps are described in detail through the following examples: The pulse compression peak value of each sub-pulse segment is used as the test threshold , for each test threshold , the signal of each sub-pulse segment is divided into a first part signal and a second part signal, the first part signal is greater than or equal to The second part of the signal is less than part of; Calculate the mean of the first part of the signal and the mean of the second part of the signal of the current sub-pulse segment, which is:

[0017]

[0018] Wherein, ave1 is the mean of the first part of the signal, ave2 is the mean of the second part of the signal, N1 is the number of sub-pulses in the first part of the signal, N2 is the number of sub-pulses in the second part of the signal, signal[i] is the signal value of the i-th sub-pulse in the first part of the signal, and signal[j] is the signal value of the j-th sub-pulse in the second part of the signal.

[0019] The variance is calculated as follows:

[0020] Wherein, d1 is the variance of the first part of the signal, and d2 is the variance of the second part of the signal.

[0021] The uniformity measure S of the current pulse segment is calculated as follows:

[0022] in, and are the ratio of the first part of the signal to the second part of the signal in the pulse segment to which they belong, namely:

[0023] Wherein, N is the total number of sub-pulses in the sub-pulse segment.

[0024] In this embodiment, the maximum value of the pulse compression peak values ​​of the above-mentioned multiple sub-pulse segments is used as the maximum test threshold, 0 is used as the minimum value of the test range, and the above-mentioned maximum test threshold is used as the maximum value of the test range. Multiple test thresholds are obtained by means of preset step values. By traversing the above-mentioned test thresholds and calculating the uniformity metric S respectively, the test threshold that minimizes the uniformity metric S is determined, so that the test threshold that minimizes the uniformity metric S is the optimal threshold.

[0025] In this embodiment, one implementation of step 108 is as follows: Step 132, determining whether the pulse compression peak value of each of the sub-pulse segments is greater than the optimal threshold; Step 134: If it is greater than, then remove the sub-pulse segments whose pulse compression peak value is greater than the optimal threshold; Step 136: If not, retain the sub-pulse segment whose pulse compression peak value is less than the optimal threshold; Step 138: Add the sub-pulse segments whose pulse compression peak values ​​are smaller than the optimal threshold to obtain the echo signal after interference suppression.

[0026] In this embodiment, after determining the optimal threshold, the interfered sub-pulse segment is determined by judging whether the pulse compression peak of each sub-pulse segment is the above-mentioned optimal threshold. That is, the sub-pulse segment whose pulse compression peak is greater than the above-mentioned optimal threshold is the interfered sub-pulse segment, and the sub-pulse segment whose pulse compression peak is less than the above-mentioned optimal threshold is the undisturbed sub-pulse segment. After eliminating the above-mentioned interfered sub-pulse segments, the retained undisturbed sub-pulse segments are accumulated to obtain the echo signal after the above-mentioned interference suppression.

[0027] In this embodiment, the acquired echo signal includes a simulated echo signal, and before step 102, the following steps are also included: Step 142: Generate a radar transmission signal according to the requirements of the radar system; Step 144, receiving an initial echo signal of the radar transmission signal, wherein the initial echo signal includes a target echo signal and noise; Step 146: Generate an interference signal; Step 148: Generate the acquired echo signal according to the interference signal and the initial echo signal.

[0028] In this embodiment, the radar transmission signal and echo signal for simulation can be generated in the above manner, and the accuracy and effectiveness of the above interference suppression method can be further accurately verified in the above manner.

[0029] In this embodiment, one implementation of step 142 is as follows: Step 152: Determine the number of sub-pulses according to the requirements of the radar system; Step 154, determining a threshold for controlling the interval of the intra-pulse coding sequence according to the number of sub-pulses, wherein the interval of adjacent elements of the intra-pulse coding sequence meets the requirement of the threshold; Step 156: De-duplicate the intra-pulse coding sequence to obtain an intra-pulse coding set, wherein the coding set does not include repeated rows.

[0030] In this embodiment, according to the requirements of the radar system, the initial carrier frequency, the number of sub-pulses, the intra-pulse coding, the number of pulses and other parameters are determined respectively, wherein the specific determination method of the intra-pulse coding is steps 152 to 156, and the radar transmission signal is constructed according to the above-determined parameters and the pulse repetition frequency, instantaneous bandwidth, pulse width and other parameters set according to the radar working characteristics and target detection needs, as follows: The radar is configured based on the determined number of pulses, target position, speed, pulse repetition frequency, pulse width and other parameters. The pulse repetition period is calculated based on the pulse repetition frequency, and the sampling rate is determined based on the instantaneous bandwidth. At the same time, the center position of the wave gate is set, which is 1 km away from the target position (the center position of the wave gate can also be adjusted according to the actual application scenario). The start sampling time, final sampling time, sampling interval and distance information are calculated based on the parameters such as the center position of the wave gate and the sampling rate.

[0031] Then, the frequency coding sequence is generated first, and the multidimensional unit array storing the frequency coding information is initialized. The pulse width, bandwidth and center frequency of each sub-pulse are calculated by determining the pulse width, number of sub-pulses, instantaneous bandwidth, etc. After transposing and reshaping the random frequency, the relevant information is filled into the unit array according to the pulse.

[0032] Next, the radar transmission signal is constructed. First, a zero matrix based on the number of pulses and the length of the sampling time is initialized. For each pulse, information is extracted from the frequency coding unit array, and then processed according to different signal models. For example, the intra-pulse frequency coding model, the sub-pulse parameters and number are obtained from the coding information, and a window function is constructed for each sub-pulse according to the pulse width. Signals are generated according to the frequency, bandwidth, window function and sampling time, and the current pulse signal is accumulated to construct the above-mentioned radar transmission signal.

[0033] The acquired echo signal is generated in the following manner: When generating the echo signal, after initializing the matrix, information is extracted from the coding array for each pulse, and a signal is generated according to the signal model and target delay, and then phase modulated and filled into the matrix in combination with the center frequency. The generation of the pulse compression reference signal is to extract information from the coding array for each pulse, and generate a signal according to parameters such as the signal model and pulse width. Finally, noise is generated based on the echo signal, bandwidth, sampling rate, and signal-to-noise ratio and added to the echo signal.

[0034] Select Hamming window as the window function, and set the window size and periodicity. Determine the length of the fast Fourier transform. Perform short-time Fourier transform on the generated radar echo signal and the reference signal, respectively, and convert the signal to the time-frequency domain for display. Figure 2 and Figure 3 , which is the echo signal and reference signal after the conversion. It can be seen that there are 8 sub-pulses.

[0035] In this embodiment, the generation of the above interference signal specifically includes the following steps: First, initialize multiple jammer-related parameters, including sampling duration, number of forwarding times, relative position to the target, out-of-pulse time, interference-to-signal ratio, jamming speed, etc., and use the flag array to determine whether the jammer is turned on.

[0036] For the turned-on jammer, the interference signal is generated according to the parameters, phase modulated considering the jammer speed, and then superimposed on the pure interference signal array according to the interference signal delay. For the turned-off jammer, the interference signal is set to zero.

[0037] After processing, each jammer adds its interference signal to the total interference signal. Finally, the total interference signal is superimposed on the original radar echo signal to obtain the echo signal containing interference.

[0038] The echo signal and the interference signal superimposed with the interference signal are processed by short-time Fourier transform and displayed graphically, so as to intuitively observe the characteristics of the interference signal, such as Figure 4 and Figure 5 shown.

[0039] It can be seen that, through the above method, the existing echo signal, reference signal and other parameters can be used to generate an interference signal and superimpose it on the echo signal.

[0040] In this embodiment, after step 102, the following steps are further included: Step 162: Perform matched filtering on each of the sub-pulse segments.

[0041] Specifically, for each sub-pulse segment , the impulse response of the matched filter Defined as:

[0042] Where * indicates complex conjugation and -t indicates time reversal.

[0043] The echo signal of each sub-pulse segment and the corresponding matched filter Perform convolution operation to obtain the signal after pulse compression .

[0044] In order to reduce the sidelobe level and improve the concentration of the main lobe, each sub-pulse segment is windowed before segmented pulse compression, and then the windowed sub-pulse signal is time-reversed and complex-conjugated to obtain the impulse response of the matched filter. Convolution operation is performed on each sub-pulse segment and the matched filter, and the obtained signal is stored in a matrix, and finally the results of all sub-pulse segments are synthesized to obtain the total pulse compression signal.

[0045] In this embodiment, the signal after pulse compression and the amplitude of each sub-pulse are displayed by a drawing function, such as Figure 6-8 shown.

[0046] In this embodiment, performing matched filtering on each sub-pulse segment in the above manner can maximize the signal-to-noise ratio of the signal.

[0047] In this embodiment, after step 108, the following steps are further included: Step 172, comparing the interfered sub-pulse segment with the generated interference signal to obtain a comparison result; Step 174: Verify the interference suppression performance of the interference suppressed echo signal according to the comparison result.

[0048] In this embodiment, the exact position of the interference signal can be determined by generating a simulated echo signal, and the effectiveness and accuracy of the interference suppression method can be verified by comparing the exact position with the position of the sub-pulse segment.

[0049] In this embodiment, the effect of the above interference suppression method is described through the following examples: In this example, it is assumed that there is a moving target in the scene, the target speed is 20m / s, and the target distance is 2000m. The radar related parameters are shown in Table 1.

[0050] Table 1 Radar simulation parameters

[0051] The interference parameters are as follows: According to the determined echo signal, target position and other parameters, the jammer parameters are initialized, and the sampling time is set to 2μs, the number of forwarding is 1, the interference signal ratio is 15dB, and the interference speed is 25m / s. The interference signal delay is calculated according to the interference distance and the radar distance information, and intermittent sampling interference is generated. The interference signal is added to the input radar echo signal to obtain the echo signal containing interference.

[0052] Generate radar transmission signal according to radar parameters, simulate signal propagation loss, and then synthesize target echo and interference signal to obtain echo signal containing interference signal (that is, acquired echo signal). Calculate sub-pulse width according to formula, segment pulse compression of echo signal containing interference, convolve with matched filter to obtain pulse compressed signal, and compare time domain waveform and spectrum analysis effect before and after pulse compression. Calculate threshold of pulse compressed signal using uniformity measurement method, and remove interfered sub-pulse according to threshold. Figure 6 This is the pulse pressure result diagram of the first sub-pulse segment. It can be seen that the interference intensity is significantly greater than the target intensity, which is regarded as the interfered sub-pulse. Figure 7 This is the pulse pressure result diagram of the second sub-pulse segment. It can be seen that the interference intensity is lower than the target intensity. Figure 8 To summarize the pulse compression results after each sub-pulse, it can be seen that there is obvious interference. Fig. 9 The pulse pressure result diagram of the signal after removing the interfered sub-pulse segment shows that an obvious suppression effect is produced on the interference.

[0053] Please refer to Fig.10 Another embodiment of the present specification provides an interference suppression system based on segmented pulse pressure and uniformity measurement, mainly comprising: A segmentation module 202, used to segment the acquired echo signal into a plurality of sub-pulse segments; A pulse compression module 204, configured to perform pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; A determination module 206 is configured to determine an optimal threshold value by taking the maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments as the maximum test threshold value of the test range, and calculating the signal uniformity index of each of the sub-pulse segments for each test threshold value, wherein the test range includes a plurality of test threshold values ​​spaced from 0 to the maximum test threshold value at a preset step value; The elimination module 208 is used to eliminate the sub-pulse segments affected by interference according to the optimal threshold and the pulse compression peak value of each sub-pulse segment to obtain the echo signal after interference suppression.

[0054] The radar signal interference suppression system can effectively reduce the attenuation and distortion of long pulse signals during propagation by segmenting the original echo signal into multiple sub-pulse segments and independently performing pulse compression processing on each sub-pulse segment. At the same time, it can effectively improve the flexibility and accuracy of signal processing by performing more detailed signal analysis on each sub-pulse segment. The pulse compression peak value of each sub-pulse segment is used as the maximum test threshold to determine the optimal threshold for the best signal uniformity, which can effectively eliminate the interfered sub-pulse segments, thereby suppressing the interference signal and further improving the accuracy and reliability of target detection by the echo signal.

[0055] In this embodiment, the determination module 206 is used to divide each of the sub-pulse segments into a first part signal and a second part signal according to the test threshold; respectively calculate the uniformity index of the first part signal and the second part signal; and take the test threshold corresponding to the minimum uniformity index as the optimal threshold. Calculate the mean of the first part signal and the mean of the second part signal; calculate the variance of the first part signal and the variance of the second part signal according to the mean of the first part signal and the mean of the second part signal; calculate the quantitative ratio of the first part signal and the second part signal in the pulse segment to which they belong; calculate the uniformity metric according to the variance of the first part signal, the variance of the second part signal, and the quantitative ratio of the first part signal and the second part signal. The above method can more accurately determine the optimal threshold with better signal uniformity, thereby effectively improving the suppression effect of interference signals.

[0056] In this embodiment, the elimination module 208 is used to determine whether the pulse compression peak value of each sub-pulse segment is greater than the optimal threshold; if greater, the sub-pulse segment with a pulse compression peak value greater than the optimal threshold is eliminated; if not, the sub-pulse segment with a pulse compression peak value less than the optimal threshold is retained; the sub-pulse segments with pulse compression peak values ​​less than the optimal threshold are added to obtain the echo signal after interference suppression. The above method can accurately determine the position of the interfered sub-pulse segment.

[0057] In this embodiment, the system further includes a generation module 210, which is used to generate a radar transmission signal according to the requirements of the radar system; receive an initial echo signal of the radar transmission signal, wherein the initial echo signal includes a target echo signal and noise; generate an interference signal; and generate the acquired echo signal according to the interference signal and the initial echo signal. According to the requirements of the radar system, the number of sub-pulses is determined; according to the number of sub-pulses, a threshold for controlling the interval of the intra-pulse coding sequence is determined, wherein the interval of adjacent elements of the intra-pulse coding sequence meets the requirements of the threshold; the intra-pulse coding sequence is deduplicated to obtain an intra-pulse coding set, wherein the coding set does not include repeated rows. The radar transmission signal and the echo signal for simulation can be generated in the above manner, and the accuracy and effectiveness of the above interference suppression method can be further accurately verified in the above manner.

[0058] In this embodiment, the system further includes a verification module 212, which is used to compare the interfered sub-pulse segment with the generated interference signal to obtain a comparison result; and verify the interference suppression of the interference suppressed echo signal according to the comparison result. By generating a simulated echo signal, the exact position of the interference signal can be determined, and by comparing the exact position with the position of the sub-pulse segment, the effectiveness and accuracy of the interference suppression method can be verified.

[0059] Based on the same invention, another embodiment of the present specification further provides a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs, and when the one or more programs are executed by an electronic device including multiple application programs, the electronic device executes Figure 1 The corresponding embodiment provides an interference suppression method based on segmented pulse pressure and uniformity measurement.

[0060] In this specification, each embodiment is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0061] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0062] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0063] This specification is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of this specification. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that has the function specified in a box.

[0064] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0065] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0066] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0067] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0068] The above is only an embodiment of the present application and is not intended to limit this specification. For those skilled in the art, this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification should be included in the scope of the claims of this specification.

Claims

1. An interference suppression method based on segmented pulse pressure and uniformity measurement, characterized in that: include: Segmenting the acquired echo signal into a plurality of sub-pulse segments; Performing pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; The maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments is used as the maximum test threshold value of the test range, and the optimal threshold value is determined by calculating the signal uniformity index of each sub-pulse segment for each test threshold value, wherein the test range includes a plurality of test threshold values ​​with a preset step value as an interval from 0 to the maximum test threshold value; According to the optimal threshold and the pulse compression peak value of each sub-pulse segment, the sub-pulse segment affected by interference is eliminated to obtain an echo signal after interference suppression.

2. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 1, characterized in that: The method of taking the maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments as the maximum test threshold value of the test range and determining the optimal threshold value by calculating the signal uniformity index of each sub-pulse segment for each test threshold value comprises: Divide each of the sub-pulse segments into a first part signal and a second part signal based on the test threshold; Calculating uniformity indexes of the first part of the signal and the second part of the signal respectively; The test threshold corresponding to the minimum uniformity index is the optimal threshold.

3. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 2, characterized in that: The respectively calculating uniformity indexes of the first part of the signal and the second part of the signal comprises: Calculate the mean of the first part of the signal and the mean of the second part of the signal; According to the mean of the first part of the signal and the mean of the second part of the signal, correspondingly calculating the variance of the first part of the signal and the variance of the second part of the signal; Calculate the signal quantity ratio between the first part signal and the second part signal in the pulse segment to which they belong; A uniformity metric is calculated according to the variance of the first signal portion, the variance of the second signal portion, and the ratio of the number of signals of the first signal portion and the second signal portion.

4. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 2, characterized in that: The first partial signal is a sub-pulse segment signal that is greater than or equal to the test threshold, and the second partial signal is a sub-pulse segment signal that is less than the test threshold.

5. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 1, characterized in that: The step of removing the sub-pulse segments affected by interference according to the optimal threshold and the pulse compression peak value of each sub-pulse segment to obtain the echo signal after interference suppression includes: Determining whether the pulse compression peak value of each of the sub-pulse segments is greater than the optimal threshold; If it is greater than, then the sub-pulse segments whose pulse compression peak value is greater than the optimal threshold are eliminated; If not, retaining the sub-pulse segment whose pulse compression peak value is smaller than the optimal threshold; Sub-pulse segments whose pulse compression peak values ​​are smaller than the optimal threshold are added to obtain the echo signal after interference suppression.

6. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 1, characterized in that: The acquired echo signal includes a simulated echo signal, and before segmenting the acquired echo signal into a plurality of sub-pulse segments, the method includes: Generate radar transmission signals according to the requirements of the radar system; Receiving an initial echo signal of the radar transmission signal, wherein the initial echo signal includes a target echo signal and noise; generating an interference signal; The acquired echo signal is generated according to the interference signal and the initial echo signal.

7. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 6, characterized in that: The generating of the radar transmission signal according to the requirements of the radar system includes: Determine the number of sub-pulses according to the requirements of the radar system; Determine a threshold for controlling the interval of the intra-pulse coding sequence according to the number of sub-pulses, wherein the interval of adjacent elements of the intra-pulse coding sequence meets the requirement of the threshold; The intra-pulse coding sequence is deduplicated to obtain an intra-pulse coding set, wherein the coding set does not include repeated rows.

8. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 1, characterized in that: After segmenting the acquired echo signal into a plurality of sub-pulse segments, the method further includes: performing matched filtering on each of the sub-pulse segments.

9. The interference suppression method based on segmented pulse pressure and uniformity measurement according to claim 6, characterized in that: After removing the sub-pulse segments affected by interference according to the optimal threshold and the pulse compression peak value of each sub-pulse segment to obtain the echo signal after interference suppression, the method further includes: Comparing the interfered sub-pulse segment with the generated interference signal to obtain a comparison result; The interference suppression performance of the echo signal after interference suppression is verified according to the comparison result.

10. An interference suppression system based on segmented pulse pressure and uniformity measurement, characterized in that: include: A segmentation module, used for segmenting the acquired echo signal into a plurality of sub-pulse segments; A pulse compression module, used for performing pulse compression on the plurality of sub-pulse segments to obtain a pulse compression peak value of each sub-pulse segment; a determination module, configured to use the maximum value of the pulse compression peak values ​​of the plurality of sub-pulse segments as the maximum test threshold value of the test range, and determine the optimal threshold value by calculating the signal uniformity index of each of the sub-pulse segments for each test threshold value, wherein the test range includes a plurality of test threshold values ​​spaced from 0 to the maximum test threshold value at a preset step value; The elimination module is used to eliminate the sub-pulse segments affected by interference according to the optimal threshold and the pulse compression peak value of each sub-pulse segment to obtain the echo signal after interference suppression.

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