A tracking radar processing method and system against intermittent relay deception jamming
By performing pulse compression and signal accumulation processing on radar signals, the problem of tracking radar being affected by intermittent relay deception interference in complex electromagnetic environments has been solved, achieving efficient target detection and tracking in complex environments.
Patent Information
- Application Number
- CN202410829409.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2044-06-25
AI Technical Summary
In modern warfare, tracking radar is susceptible to active electromagnetic interference in complex electromagnetic environments, which leads to a decrease in detection probability, an increase in false alarm probability, and a decrease in tracking accuracy. In particular, when faced with intermittent relay deception jamming, the jammer cannot accurately measure the pulse repetition period, resulting in incomplete coverage of the deception jamming signal and affecting target detection and tracking.
By performing pulse compression processing during the radar signal processing stage, pulse dimension data from N range cells to the left and right of the center gate are selected, and the average value of the data magnitude is calculated as a reference. The maximum value is compared with the threshold deviation, and interference signals are screened out and corresponding signal accumulation processing is performed, including non-coherent accumulation and coherent accumulation, thereby improving the signal processing capability.
It effectively reduces or eliminates the effects of deception interference, improves the radar's target detection and tracking capabilities in complex electromagnetic environments, reduces the probability of false alarms, and enhances tracking accuracy.
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Figure CN118818438B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the radar anti-jamming, signal processing technical field, and particularly relates to a tracking radar processing method and system for intermittent retransmission deception jamming. BACKGROUND
[0002] The function of the tracking radar is to measure and track the target in real time with high precision, and output target information to provide the weapon system with strike. In modern war, the complex battlefield electromagnetic environment and the existence of active electromagnetic interference can reduce the detection probability of the radar, increase the false alarm probability, and cause the loss of tracking precision and even the loss of target in the tracking process, which seriously affects the detection and tracking function of the radar. With the development of electronic devices and digital technology, the jammer using digital radio frequency storage technology has the characteristics of small size, light weight, fast frequency measurement, wide bandwidth, and multiple types of released jamming, which aggravates the threat to the radar. In the traditional countermeasure mode, the frequency agile mode in the frequency domain has been basically ineffective, the jamming form in the space domain gradually changes from the sidelobe jamming to the main lobe jamming form of the target-mounted jammer, and the threat is greater, and the measures and ability to counter the main lobe jamming are limited. The jammer generally uses the time-sharing or simultaneous receiving and transmitting mode to receive the measurement radar signal and release the jamming signal. The simultaneous receiving and transmitting mode has the problem of receiving and transmitting isolation, especially in the missile-borne environment, since the distance between the receiving and transmitting antennas of the jammer is very close, when the simultaneous receiving and transmitting mode is used, the self-excitation of the jammer (abnormal frequency measurement and abnormal retransmission) will occur, therefore, the jammer generally uses the time-sharing receiving and transmitting mode, and the typical feature of the time-sharing receiving and transmitting mode is that the signal cannot be transmitted when the signal is received.
[0003] When the jammer receives the first or first few pulse repetition period signals of the radar, since the parameters (including frequency, pulse repetition period, pulse width, etc.) of the radar need to be measured, the jammer cannot transmit effective jamming signals.
[0004] When the jammer releases active deception jamming (range delay jamming, velocity delay jamming, and range-velocity double delay jamming), since the jammer needs to measure the frequency and retransmit the signal, this causes the deception jamming signal and the target echo to be not coincident in distance, in order to achieve the purpose of deception delay, the jammer must accurately measure the pulse repetition period and release the jamming signal after a period of delay, so as to compensate for the distance system difference, and the parameters of the radar need to be measured in real time to prevent the mismatch between the jamming parameters and the radar parameters. From the radar echo, the deception jamming signal cannot completely cover the slow time dimension.
[0005] In the complex electromagnetic environment, the jammer faces various types and spatial arrangements of active radio frequency devices, which causes the jammer to not necessarily release effective jamming signals to the tracking radar, and from the radar echo, the active deception jamming signal can not completely cover the slow time dimension. SUMMARY
[0006] Embodiments of the present application provide a tracking radar processing method and system for intermittent retransmission deception jamming, to perform effective signal screening processing in the signal processing stage, avoid the influence of active frequency deception electronic jamming on target detection tracking, and improve the ability of the radar in a complex electromagnetic environment.
[0007] Embodiments of the present application provide a tracking radar processing method for intermittent retransmission deception jamming, comprising:
[0008] In the case that the radar is in a tracking state, performing pulse compression processing on the radar signals in the observation range of the radar;
[0009] Selecting pulse dimension data of N distance units on the left and right of the tracking center wave gate after the pulse compression processing;
[0010] Sorting the pulse dimension data of any distance unit, and taking the average value of the minimum L data module values as the reference datum of the distance unit;
[0011] Determining the deviation between the maximum value of the pulse dimension data of any distance unit and the reference datum, and determining that there is jamming in the case that the deviations are all greater than a preset threshold value;
[0012] Comparing the pulse dimension data of any distance unit with the reference datum, setting the signals greater than the preset threshold value to 0, and calculating the proportion of the number of each distance unit set to 0 and the pulse number;
[0013] According to the size relationship between the calculated proportion and the preset proportion threshold value, performing corresponding signal processing mode on the signals.
[0014] Optionally, according to the size relationship between the calculated proportion and the preset proportion threshold value, performing corresponding signal processing mode on the signals comprises:
[0015] When the proportion coefficient is greater than the preset proportion threshold value β, performing non-coherent accumulation processing on the signals;
[0016] When the proportion coefficient is less than the preset proportion threshold value β, performing coherent accumulation on the signals.
[0017] Optionally, when the proportion coefficient is greater than the preset proportion threshold value β, performing non-coherent accumulation processing on the signals specifically comprises:
[0018]
[0019] Wherein, S1(m,n) represents the signals after setting the signals greater than the preset threshold value to 0 after comparing the pulse dimension data of the distance unit with the reference datum, and M represents the total pulse number.
[0020] When the proportion coefficient is less than the preset proportion threshold β, the coherent accumulation of the signal specifically includes:
[0021] Sc=FFT(S1(m,n))
[0022] Optionally, the method further comprises:
[0023] The signal after the non-coherent accumulation processing or the coherent accumulation processing is subjected to target detection and tracking, wherein for the signal after the non-coherent accumulation processing, the speed is replaced by the distance change rate in the distance-speed double loop tracking.
[0024] Optionally, the preset threshold satisfies:
[0025]
[0026] wherein, P fa is the false alarm probability under noise distribution;
[0027] The deviation between the maximum value of the pulse dimension data of any distance unit and the reference benchmark is determined, and in the case that all the deviations are greater than a preset threshold, it is determined that there is interference.
[0028] The ratio between the maximum value of the pulse dimension data of any distance unit and the reference benchmark is determined.
[0029] If the ratio between the maximum value of the pulse dimension data of N distance units and the reference benchmark is greater than the preset threshold, it is determined that there is interference.
[0030] Optionally, the calculation of the proportion of the number of zeros to the number of pulses of each distance unit specifically includes:
[0031] The proportion of the number of zeros to the number of pulses of any distance unit is calculated, and the maximum value of the proportion is taken as the proportion coefficient.
[0032] Optionally, the method further comprises: after the end of the frequency agility period, the radar determines a frequency that is not interfered, and transmits the frequency that is not interfered as a frequency that cannot be effectively interfered by the jammer.
[0033] Embodiments of the present application also propose a tracking radar processing system for intermittent forwarding deception jamming, comprising a processor and a memory, the memory stores a computer program, and the computer program is executed by the processor to realize the steps of the tracking radar processing method for intermittent forwarding deception jamming as described above.
[0034] The embodiment of the present application utilizes echo signals of the first several pulse repetition periods of the radar to perform interference detection, and screens valid interference-free data in the whole pulse repetition period signal to perform corresponding signal processing, thereby weakening or even eliminating the influence of deceptive interference, avoiding the influence of active frequency-agile deceptive electronic interference on target detection and tracking, and improving the capability of the radar in a complex electromagnetic environment.
[0035] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood and implemented according to the contents of the description, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and understandable, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS
[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:
[0037] Figure 1 The basic flow of the tracking radar processing method of the embodiment of the present application is shown;
[0038] Figure 2 The overall flow of the application example of the tracking radar processing method of the embodiment of the present application is shown;
[0039] Figure 3 The observation range signal data format of the tracking radar processing method of the embodiment of the present application is shown. DETAILED DESCRIPTION
[0040] Exemplary embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.
[0041] The method of the embodiment of the present application is used when the jammer works in a time-division transceiving release active deceptive interference, and exists:
[0042] 1) The jammer cannot release valid interference signals in the first or first several pulse repetition periods of the radar;
[0043] 2) The interference signals cannot cover the whole slow time dimension when aligning with the target echo;
[0044] 3) In a complex electromagnetic environment, the jammer can not release valid deceptive interference to the tracking radar at some moments.
[0045] Based on the three working characteristics, the application provides a tracking radar processing method for intermittent forwarding deception jamming, as shown in Figure 1 、 Figure 2 , which comprises the following steps:
[0046] In step S101, when the radar is in a tracking state, pulse compression processing is performed on the radar signals in the observation range of the radar. In a specific example, it is assumed that the radar works in a frequency agile mode, and the frequency hopping sequence is F1, F2, F i ,…F 10 . When the radar is in a tracking state, the pulse compression is performed on the signals received by the radar in the observation range at the working frequency F i .
[0047] In step S102, the pulse dimension data of N distance units on the left and right of the tracking center wave gate after pulse compression processing are selected. Based on the foregoing example, the tracking observation range signal S(m, n) of N distance units is selected, where m represents the pulse repetition period number, n is the distance sampling point number, the data size is MxN, and the data format is as shown in Figure 3 .
[0048] In step S103, the pulse dimension data of any distance unit are sorted, and the average value of the smallest L data modulus values is taken as the reference datum of the distance unit. In some specific examples, the pulse dimension data of each distance unit are sorted, and the average value of the smallest L data modulus values is taken as the reference datum of the distance unit. .
[0049] In step S104, the deviation between the maximum value of the pulse dimension data of any distance unit and the reference datum is determined, and when the deviations are all greater than a preset threshold, it is determined that there is jamming, otherwise, there is no jamming.
[0050] In some embodiments, the preset threshold satisfies:
[0051]
[0052] , where P fa is the false alarm probability under noise distribution, which can be, for example, 10 -6 , or 10 -9 , etc.
[0053] The deviation between the maximum value of the pulse dimension data of any distance unit and the reference datum is determined, and when the deviations are all greater than a preset threshold, it is determined that there is jamming, which comprises:
[0054] determining the ratio between the maximum value of the pulse width data of any range cell and the reference datum;
[0055] If the ratio between the maximum value of the pulse width data of the N range cells and the reference datum is greater than the preset threshold value, it is determined that there is interference.
[0056] In step S105, the pulse width data of any range cell is compared with the reference datum, signals greater than the preset threshold value are set to 0, and the proportion of the number of range cells set to 0 to the number of pulses is calculated. In some embodiments, calculating the proportion of the number of range cells set to 0 to the number of pulses specifically includes: calculating the proportion of the number of range cells set to 0 to the number of pulses, and taking the maximum value of the proportion as the proportion coefficient. Specifically, the pulse width data of each range cell is compared with the reference data base value The signals greater than the preset threshold value T(n) are set to 0 to obtain the signal S1(m, n), the proportion k(n) = M1(n) / M of the number of points over the threshold (the preset threshold value) M1(n) to the total number of pulses M is calculated, and the maximum value is taken as the proportion coefficient h = max(k(n)).
[0057] In step S106, according to the size relationship between the calculated proportion and the preset proportion threshold value, the signal is executed corresponding signal processing mode.
[0058] The embodiments of the present application utilize the echo signals of the first few pulse repetition periods of the radar to perform interference detection, and screen effective and non-interference data in the entire pulse repetition period signal for corresponding signal processing, thereby weakening or even eliminating the influence of deceptive jamming, avoiding the influence of active frequency-agile deceptive electronic jamming on target detection and tracking, and improving the ability of the radar in a complex electromagnetic environment.
[0059] In some embodiments, according to the size relationship between the calculated proportion and the preset proportion threshold value, the signal is executed corresponding signal processing mode includes:
[0060] When the proportion coefficient is greater than the preset proportion threshold value β (that is, there is interference and there are few effective signals), non-coherent accumulation processing is performed on the signal.
[0061] When the proportion coefficient is less than the preset proportion threshold value β (that is, there is no interference and there are many effective signals), coherent accumulation is performed on the signal.
[0062] In some embodiments, when the proportion coefficient is greater than the preset proportion threshold value β, the non-coherent accumulation processing on the signal specifically includes:
[0063]
[0064] Wherein, S1(m,n) represents the signal after comparing the pulse dimension data of the distance unit with the reference benchmark and setting the signal greater than the pre-screening threshold to zero, and M represents the total number of pulses;
[0065] When the scaling factor is less than the preset scaling threshold β, the coherent accumulation of the signal specifically includes:
[0066] Sc = FFT(S1(m,n)).
[0067] In some embodiments, it also includes:
[0068] Target detection and tracking are performed on signals that have undergone non-coherent accumulation processing or coherent accumulation processing. For signals that have undergone non-coherent accumulation processing, in the case of dual-loop tracking of distance and velocity, velocity is replaced by the rate of change of distance.
[0069] In some embodiments, it further includes: after the radar completes its frequency agile cycle, for example, F1, F2, F... i ,…F 10 After the process is completed, the uninterrupted frequency is determined and used as the frequency at which the jammer cannot release effective interference.
[0070] This application addresses the problem of performance degradation or even target detection failure of tracking radar when faced with electronic active deception jamming. Based on the time-division multiplexing mode of the missile-borne jammer, and the fact that the jamming signal cannot fully cover the entire coherent processing cycle due to the need to align the jamming signal and the target signal in the range dimension, the method improves anti-jamming performance by filtering out undisturbed signals for jamming detection and signal processing, thereby enhancing the radar's target tracking capability in complex electromagnetic environments. This method significantly extracts effective information from the echo signal, reduces performance loss caused by jamming signals, has low computational complexity, and can achieve real-time processing.
[0071] This application also proposes a tracking radar processing system for intermittent forwarding deception jamming, including a processor and a memory. The memory stores a computer program, which, when executed by the processor, implements the steps of the aforementioned tracking radar processing method for intermittent forwarding deception jamming.
[0072] It should be noted that, in the embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0073] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.
[0074] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and a necessary general hardware platform, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product in essence or in the form of a part of the prior art that contributes to the present application. The computer software product is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a plurality of instructions for causing a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the various embodiments of the present application.
[0075] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope of protection of the claims.
Claims
1. A tracking radar processing method for intermittent relay deception jamming, characterized in that, include: When the radar is in tracking mode, the radar signal within the radar's observation range is subjected to pulse compression processing. Select pulse dimension data from N distance units to the left and right of the tracking center gate after pulse compression processing; The pulse dimension data of any selected distance unit are sorted, and the average of the L smallest data magnitudes is taken as the reference benchmark for any distance unit. Determine the deviation between the maximum value of the pulse dimension data of any distance unit and the reference benchmark. If the deviation is greater than a preset threshold, it is determined that there is interference. The pulse dimension data of any distance unit is compared with the reference benchmark, signals that are greater than the preset threshold are set to 0, and the ratio of the number of zeros in each distance unit to the number of pulses is calculated. Based on the relationship between the calculated ratio and the preset ratio threshold, the corresponding signal processing method is performed on the signal.
2. The tracking radar processing method for intermittent relay deception jamming as described in claim 1, characterized in that, Based on the relationship between the calculated ratio and the preset ratio threshold, the signal processing methods include: When the scaling factor is greater than the preset scaling threshold β, the signal is subjected to non-coherent accumulation processing; When the scaling factor is less than the preset scaling threshold β, the signal is coherently accumulated.
3. The tracking radar processing method for intermittent relay deception jamming as described in claim 2, characterized in that, When the scaling factor is greater than the preset scaling threshold β, the noncoherent accumulation processing of the signal specifically includes: Wherein, S1(m,n) represents the signal after comparing the pulse dimension data of the distance unit with the reference benchmark and setting the signal greater than the preset threshold to zero, and M represents the total number of pulses; When the scaling factor is less than the preset scaling threshold β, the coherent accumulation of the signal specifically includes: Sc = FFT(S1(m,n)).
4. The tracking radar processing method for intermittent relay deception jamming as described in claim 3, characterized in that, Also includes: Target detection and tracking are performed on signals that have undergone non-coherent accumulation processing or coherent accumulation processing. For signals that have undergone non-coherent accumulation processing, in the case of dual-loop tracking of distance and velocity, velocity is replaced by the rate of change of distance.
5. The tracking radar processing method for intermittent relay deception jamming as described in claim 1, characterized in that, The preset threshold satisfies: Among them, P fa The false alarm probability under the noise distribution; Determine the deviation between the maximum value of the pulse dimension data of any distance unit and the reference benchmark. If all deviations are greater than a preset threshold, determine that interference exists, including: Determine the ratio between the maximum value of the pulse dimension data of any distance cell and the reference benchmark; If the ratio between the maximum value of the pulse dimension data of N distance units and the reference benchmark is greater than the preset threshold, then interference is determined to exist.
6. The tracking radar processing method for intermittent relay deception jamming as described in claim 4, characterized in that, The calculation of the ratio of the number of zeros in each distance unit to the number of pulses specifically includes: Calculate the ratio of the number of zeros in any distance cell to the number of pulses, and take the maximum value of the ratio as the scaling factor.
7. The tracking radar processing method for intermittent relay deception jamming as described in claim 1, characterized in that, Also includes: After the frequency agile cycle ends, the radar determines the uninterrupted frequency and transmits the uninterrupted frequency as the frequency at which the jammer cannot release effective interference.
8. A tracking radar processing system for intermittent relay deception jamming, characterized in that, It includes a processor and a memory, the memory storing a computer program that, when executed by the processor, implements the steps of the tracking radar processing method against intermittent forwarding deception jamming as described in any one of claims 1 to 7.