Method for realizing accurate interference of missile-borne penetration interference machine
By time-sharing switching of the local oscillator and signal library comparison, the missile-borne penetration jammer can accurately interfere with the signal of interest, solving the problems of high volume and power consumption requirements and improving the jamming efficiency and accuracy.
Patent Information
- Application Number
- CN202510818044.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-09-12
AI Technical Summary
Existing missile-borne penetration jammers have high requirements for size, power consumption and heat dissipation, making it difficult to accurately jam signals of interest. In addition, existing solutions cannot effectively distinguish signal types, resulting in low jamming efficiency.
It adopts time-sharing switching of multiple local oscillators, compares PDW information with the preset rejection signal library and high-threat signal library, sorts and processes radar signals, and only interferes with the signals of interest. It uses a low instantaneous width jammer to achieve precise interference without adding a broadband receiver.
Under the premise of ensuring volume and power consumption requirements, it improves the jamming efficiency, saves jamming resources, protects friendly radars, and improves the jamming accuracy in complex electromagnetic environments.
Smart Images
Figure CN120639239A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of electronic countermeasure technology, and in particular to a method for achieving precise jamming of a missile-borne penetration jammer. Background Art
[0002] Advances in air defense technology are challenging traditional penetration methods (such as high speed and stealth). Missile-borne penetration jammers disrupt the detection, identification, and tracking of missiles by anti-missile radars and interceptor missile seekers, making it difficult for anti-missile weapons to intercept incoming missiles. Through electromagnetic suppression or deception, they can significantly increase the probability of missile penetration.
[0003] However, missile-borne jammers have high requirements for size and can only be powered by the missile itself, placing high demands on the jammer's size, power consumption, and heat dissipation capabilities. Existing solutions address this issue by using devices with large instantaneous widths to cover more radar frequency bands while ensuring jamming effectiveness. However, using devices with large instantaneous widths results in high energy consumption, bulk, and high heat dissipation requirements, which are mutually exclusive.
[0004] Furthermore, missile-borne jammers have high requirements for size, which also means limited transmission power. However, existing jamming solutions struggle to achieve precise jamming after the "reception-analysis-jamming" process, resulting in limited energy being used to jam the signal of interest. To address this issue, existing solutions fail to precisely jam the signal of interest and remain silent on signals of no interest, thereby maximizing jamming efficiency. Alternatively, existing solutions directly jam the received signal without distinguishing it, which reduces jamming efficiency. Summary of the Invention
[0005] In response to the defects in the existing technology, the present invention provides a method for achieving precise interference of missile-borne penetration jammers, so as to solve the problem of using low instantaneous width jammers to deal with radars with a wide working bandwidth in missile-borne penetration jamming scenarios, and simultaneously solve the problem of effectively using the limited jamming resources to interfere with the radar of interest in a complex electromagnetic environment.
[0006] The present invention provides a method for achieving precise jamming of a missile-borne penetration jammer, comprising: Multiple local oscillators are switched in time-sharing mode within the reconnaissance window, and the PDW information is compared with the preset rejection signal library one by one, and then sorted; Compare the sorted PDW information with the high-threat signal library, switch to the local oscillator output reconnaissance information corresponding to the high-threat information, and enter the interference window; The frequency information of the radar signal is measured within the interference window. If the frequency information matches the reconnaissance information or the high-threat signal library, the sampling gate is pulled up to sample the signal and interference is performed according to the transmission gate. When no interference is performed within the preset first time, exit the interference window and enter the reconnaissance window again.
[0007] It can be seen from the above technical solutions that the present invention provides a method for realizing precise interference of missile-borne penetration jammers. Without adding a broadband receiver, interference can be achieved by using a low instantaneous width jammer, thereby ensuring requirements such as volume and power consumption. By setting up a signal elimination library, signals that do not need to be interfered with are stored therein, saving interference resources while protecting friendly radars. By setting up a high-threat signal library, resources can be applied to radars of interest in response to complex electromagnetic environments, thereby improving interference efficiency and reducing power consumption requirements.
[0008] Optionally, the local oscillator is switched in time-sharing mode within the reconnaissance window, and the PDW information is compared one by one with a preset rejection signal library, followed by sorting processing, including: Enter the reconnaissance window and compare the measured PDW information with the rejection signal library to eliminate signals of no interest; If there is still PDW information after the removal, the PDW information that has not been removed is sorted and processed.
[0009] It can be seen from the above technical solution that if there is still PDW information after comparing with the eliminated signal library, it means that after excluding the uninteresting signals, there is still information that needs to be interfered with. At this time, the PDW information is sorted and the messy PDW information is clustered.
[0010] Optionally, the PDW information that is not eliminated is sorted and processed, including: Clustering based on pulse arrival angle, carrier frequency and pulse width; By accumulating histograms at all levels, the possible pulse repetition intervals in the original sequence are estimated and used as search intervals to perform sequence retrieval on the radar PDW information, and the PDW sequences belonging to the same radiation source are obtained respectively. Statistics and extraction of radiation source signal parameters after sorting; Complete the identification and classification of radiation source information after parameter analysis.
[0011] It can be seen from the above technical solution that by performing signal sorting on the PDW information, the originally chaotic PDW signals can be determined to which radar signals they belong after sorting.
[0012] Optionally, comparing the sorted signal with a high-threat signal library and switching to a local oscillator corresponding to the high-threat information includes: Matching the sorting processing results or PDW information corresponding to the multiple local oscillators with the high-threat signal library; The local oscillator corresponding to the information with a higher threat level is selected; the threat level is determined by the repetition rate, and the higher the repetition rate, the higher the threat level.
[0013] It can be seen from the above technical solution that since the sorting process may cause inaccurate information due to insufficient PDW data, the judgment is made based on the feedback information given after the sorting process: if the sorting result is correct, the sorting result is directly compared with the high-threat signal library; if the result is not sorted, the PDW information obtained after elimination and comparison is directly compared with the high-threat signal library; finally, the compared EDW information or PDW information is output.
[0014] Optionally, the selecting of the local oscillator corresponding to the information with a higher threat level is specifically: When only one local oscillator has information, the local oscillator with information is selected; When there are multiple local oscillators with information, the local oscillator with higher threat level information is selected; When there is no local oscillator information, scan again.
[0015] Optionally, the rejection signal library includes known friendly force signals and interference signals in the environment; and the high-threat signal library includes known high-threat target signals.
[0016] Optionally, the interference pattern within the interference window is intermittent sampling within the pulse, which can protect the missile itself from penetrating and achieve the purpose of protecting itself.
[0017] Optionally, measuring the frequency information of the radar signal within the interference window, and if the frequency information matches the reconnaissance information or the high-threat signal library, raising a sampling gate to sample the signal, and performing interference according to a transmission gate, includes: When the sampling window is pulled up, the frequency information of the measured signal is compared with the reconnaissance information and high-threat information database in real time; when the frequency information matches the reconnaissance information or high-threat information database, the sampling gate is pulled up to sample the signal; Transmitting an interference signal according to a transmitting wave gate; After the pulse width information is obtained, the pulse width information and frequency information are combined and compared with the reconnaissance information and high-threat information database; if there is no match, the frequency information will not be responded to within the subsequent preset second time.
[0018] It can be seen from the above technical solution that when the sampling window is opened, the measured frequency information will still be compared with the high-threat information library, which can avoid the variability of radar signals and the situation where the signal does not arrive in the reconnaissance window but arrives in the interference window, thereby improving the interference accuracy; then the pulse width information and frequency information are combined and compared, which can prevent the situation where the frequency is consistent but the pulse width does not match and is not accurately eliminated.
[0019] Optionally, pulse width information is determined based on a fusion gate, which is a fusion of a sampling gate and a transmit gate. Frequency information can be measured in real time, but pulse width information can only be measured after the signal has passed. Since both the sampling gate and the transmit gate are generated by their own devices, a fusion gate can be formed by fusing the sampling and transmit gates. The fusion gate is essentially equal to the radar signal pulse width, with an error of one sampling period.
[0020] By adopting the above technical solution, this application has the following beneficial effects: The present invention provides a method for achieving precise interference of a missile-borne penetration jammer. Without adding a broadband receiver, interference can be achieved by using a low instantaneous width jammer, thereby ensuring requirements such as volume and power consumption. By setting up a signal rejection library, signals that do not need to be interfered with are stored therein, saving interference resources while protecting friendly radars. By setting up a high-threat signal library, resources can be applied to radars of interest in response to complex electromagnetic environments, thereby improving interference efficiency and reducing power consumption requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.
[0022] Figure 1 A flow chart of a method for achieving precise jamming of a missile-borne penetration jammer provided by an embodiment of the present invention is shown; Figure 2 shows a structural block diagram of a sorting module provided by an embodiment of the present invention; Figure 3 A flowchart of a reconnaissance window provided by an embodiment of the present invention is shown; Figure 4 shows a timing diagram within an interference window provided by an embodiment of the present invention; Figure 5 Another flow chart of a method for achieving precise jamming of a missile-borne penetration jammer provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION
[0023] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.
[0024] like Figure 1 As shown, this embodiment provides a method for achieving precise jamming of a missile-borne penetration jammer, including: S1. Multiple local oscillators are switched in time-sharing mode within the reconnaissance window. The PDW (Pulse Discreption Word) information is compared one by one with the preset rejection signal library, and then sorted.
[0025] Wherein, step S1 includes: S101. Enter the reconnaissance window, compare the measured PDW signal with the rejection signal library, and eliminate signals of no interest; S102. If PDW information still exists after the removal, the PDW information that has not been removed is sorted.
[0026] If there is still PDW information after comparing with the eliminated signal library, it means that after excluding the uninteresting signals, there is still information that needs to be interfered with. At this time, the PDW information is sorted and the messy PDW information is clustered.
[0027] Specifically, the PDW information that has not been eliminated is sorted in S102, including: Clustering based on pulse arrival angle, carrier frequency and pulse width; By accumulating histograms at all levels, the possible pulse repetition intervals in the original sequence are estimated and used as search intervals to perform sequence retrieval on the radar PDW information, and the PDW sequences belonging to the same radiation source are obtained respectively. Statistics and extraction of radiation source signal parameters after sorting; Complete the identification and classification of radiation source information after parameter analysis.
[0028] Signal sorting is a function that classifies all PDW information according to different radiation sources. The input of the system is the PDW information sequence. According to the frame length set by the host computer, the PDW information received within the frame length is sent to the sorting. By performing signal sorting on the PDW information, the originally chaotic PDW information can be determined to which radar signals it belongs after sorting. Figure 2 As shown in FIG, a structural block diagram of a sorting module is provided. After the PDW information is input into the sorting module, it passes through the pre-sorting module, the main sorting module, the signal parameter analysis module and the radiation source identification module in sequence.
[0029] The pre-sorting module implements pre-sorting based on pulse arrival angle, carrier frequency, and pulse width. After pre-sorting, the PDW sequence undergoes primary signal sorting. By classifying the PDWs and then performing primary sorting for unknown radiation sources, the number of PDWs processed each time can be reduced, improving processing speed.
[0030] The main sorting module selects the CDIF cumulative histogram algorithm and estimates the possible PRI (Pulse Repetition Interval) in the original sequence by accumulating histograms at all levels. This PRI is used as the search interval to perform sequence retrieval on the PDW sequence and obtain the PDW sequences belonging to the same radiation source.
[0031] The signal parameter analysis module completes the statistical analysis and extraction of the radiation source signal parameters after sorting, including the pulse width, frequency, pulse repetition period and emission sequence of each basic waveform of the radiation source, and outputs the radiation source information.
[0032] The radiation source identification module completes the function of identifying and classifying the radiation source information after parameter analysis.
[0033] S2. Compare the sorted PDW information with the high-threat signal library, switch to the local oscillator output reconnaissance information corresponding to the high-threat information, and enter the interference window.
[0034] Wherein, step S2 includes: Matching the sorting processing results or PDW information corresponding to multiple local oscillators with the high-threat signal library; The local oscillator corresponding to the information with a higher threat level is selected; the threat level is determined by the repetition rate, and the higher the repetition rate, the higher the threat level.
[0035] Since the sorting process may result in inaccurate sorted information due to insufficient PDW data, the judgment is made based on the feedback information given after the sorting process: if the sorting result is correct, the sorting result is directly compared with the high-threat signal library; if the result is not sorted, the PDW information obtained after elimination and comparison is directly compared with the high-threat signal library; finally, the compared EDW (Emitter Discreption Word) information or PDW information is output.
[0036] In the above, the local oscillator corresponding to the information with a higher threat level is selected, specifically: When only one local oscillator has information, the local oscillator with information is selected; When there are multiple local oscillators with information, the local oscillator with higher threat level information is selected; When there is no local oscillator information, scan again.
[0037] Optionally, the rejection signal library includes known friendly signals and environmental interference signals, while the high-threat signal library includes known high-threat target signals. Users can customize both the high-threat signal library and the rejection signal library (including frequency and pulse width information). The high-threat library refers to known high-threat targets, meaning that only these signals are intended to be interfered with as much as possible. The rejection signal library includes known friendly signals and known environmental interference signals (such as continuous wave signals), which are not jammed even when detected. This saves jamming resources and protects friendly radars.
[0038] like Figure 3 As shown, a flow chart within the reconnaissance window is provided, including process steps S1 and S2; after executing steps S1 and S2, the local oscillator corresponding to the high threat information outputs reconnaissance information.
[0039] S3. Measure the frequency information of the radar signal within the interference window. If the frequency information matches the reconnaissance information or the high-threat signal library, pull up the sampling gate to sample the signal and perform interference according to the transmission gate; Specifically, the interference pattern within the interference window is intermittent sampling within the pulse, which can protect the missile itself from penetrating and achieve the purpose of protecting itself.
[0040] Wherein, step S3 includes: S301. When the sampling window is pulled up, the frequency information of the measured signal is compared with the reconnaissance information and the high-threat information library in real time; when the frequency information matches the reconnaissance information or the high-threat information library, the sampling gate is pulled up to sample the signal; S302 transmits an interference signal according to the transmission wave gate; S303. After the pulse width information is obtained, the pulse width information and frequency information are combined and compared with the reconnaissance information and the high-threat information database; if there is no match, the frequency information is not responded to within a subsequent preset second time.
[0041] Radar signals are often pulse-group signals. Radars transmit multiple pulses at a specific pulse repetition frequency (PRF), forming a pulse group. The duration of a pulse group is equivalent to the radar's coherent processing interval (CPI). The pulse width within a pulse group remains constant. Therefore, if the pulse width and frequency do not match, the radar will not respond to this frequency information for a period of CPI / 2. Therefore, the preset second time may vary between different radars. In one specific embodiment, the preset second time can be set to 3ms based on experience.
[0042] When the sampling window is opened, the measured frequency information will still be compared with the high-threat information library to avoid the variability of radar signals, such as the signal not arriving in the reconnaissance window but arriving in the interference window, thereby improving the accuracy of interference. The pulse width information and frequency information are then combined and compared to prevent the situation where the frequency is consistent but the pulse width is inconsistent and is not accurately eliminated.
[0043] It should be noted that when the sampling window is raised, the device is receiving, but sampling is not necessarily performed. Sampling occurs only when there is an external signal and the frequency information matches the high-threat information database. The generation of an interference signal requires both the following: the sampling gate is raised to sample the radar signal; then the transmit gate is raised to transmit the signal.
[0044] Figure 4 A timing diagram within an interference window is provided. Figure 4 As shown in the figure, within the interference window, since it is a time-sharing system, it is also divided into sampling and transmission. When the sampling gate is "1", the device is in the receiving state and samples the external radar signal; when the transmission gate is "1", the device is in the transmitting state and transmits the interference signal; during the sampling stage, the device not only samples the signal, but also performs synchronous detection to obtain the frequency information of the signal.
[0045] If a match fails, the sampling gate will not be raised, and interference will not occur. Because the signal is short-wavelength and the radar's operating bandwidth is wide, the sampling gate cannot be raised at this local oscillator, indicating that the local oscillator currently does not have the signal of interest. After the sampling gate interval has expired, if the sampling gate is not raised again, the interference window will be exited and the reconnaissance window will be re-entered. This cycle repeats to ensure that the radar's operating bandwidth is covered as much as possible and that it can keep up with changes in the radar signal. The aforementioned rejection and comparison logic is used to ensure that only interference energy is used on the signal of interest, and is not "distracted" by other signals of no interest.
[0046] Optionally, the pulse width information is determined by a fusion gate, which is formed by the fusion of the sampling gate and the emission gate. Frequency information can be measured in real time, but pulse width information can only be measured after the signal has passed. Since both the sampling gate and the emission gate are generated by the device, the device can fuse the two gates to form a fusion gate. Figure 4 It can be seen that the fusion gate is basically equal to the radar signal pulse width, and the error is one sampling time, which can be used as pulse width information for subsequent judgment.
[0047] S4. When no interference is performed within the preset first time, exit the interference window and re-enter the reconnaissance window.
[0048] The preset first time is an empirical value, and in one embodiment, it is set to 100ms. If a new sampling gate is not opened within 100ms, it means that there is no external signal within 100ms. At this time, it is necessary to switch to the next local oscillator, and the radar signal may hop to another local oscillator.
[0049] The following is a specific example. The microwave is designed to have an instantaneous width of 1G. Multiple local oscillator switches can cover a wider frequency band. The signal processing module's receiving and transmitting instantaneous widths are both 1G. Taking the interference target's working frequency band of 4-6G as an example, only two local oscillators need to be scanned to cover the entire working bandwidth. The overall interference process based on the method provided in this embodiment is as follows: Figure 5 shown.
[0050] First, enter the first local oscillator and open the reconnaissance window for reconnaissance. Within the reconnaissance window, first, based on the PDW information, the "rejection signal library" is used to remove uninteresting signals (for example, some electromagnetic environments have known continuous wave signals to prevent them from affecting the interference effect and are removed). The removed signals are sent to the sorting module to obtain EDW information. The second local oscillator follows the above process to obtain EDW information. The EDW information obtained from the first and second sections is analyzed: 1. If only one of the local oscillators has a signal, the local oscillator is switched to that local oscillator and enters the interference window; 2. If there is no signal from either local oscillator, repeat the above scan; 3. If both LOs have signals, determine which signal is the more threatening signal and select the corresponding LO (a high repetition rate signal is defined as a high threat signal because high repetition rates are often tracking signals); After completing the above reconnaissance steps, it will switch to the corresponding local oscillator and enter the interference state; After entering the interference window, interference is performed according to the preset parameters. Since it is still necessary to switch between receiving and transmitting within the interference window to realize the operation of sampling and transmitting signals, it is still necessary to detect external signals and match the frequency and pulse width when sampling signals. Interference will only be performed when encountering the frequency and pulse width information sent within the reconnaissance window. If no interference is performed within 100ms (the sampling wave gate is not pulled up), reconnaissance will be automatically entered again.
[0051] Based on this, without adding broadband receivers, interference can be achieved by using low instantaneous width jammers to ensure requirements such as volume and power consumption; by setting up a signal rejection library, signals that do not need to be interfered with are stored in it, saving interference resources while protecting friendly radars; by setting up a high-threat signal library, when dealing with complex electromagnetic environments, resources can be applied to radars of interest, improving interference efficiency and reducing power consumption requirements.
[0052] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.
Claims
1. A method for achieving precise jamming of missile-borne penetration jammers, characterized in that: include: Multiple local oscillators are switched in time-sharing mode within the reconnaissance window, and the PDW information is compared with the preset rejection signal library one by one, and then sorted; Compare the sorted PDW information with the high-threat signal library, switch to the local oscillator output reconnaissance information corresponding to the high-threat information, and enter the interference window; The frequency information of the radar signal is measured within the interference window. If the frequency information matches the reconnaissance information or the high-threat signal library, the sampling gate is pulled up to sample the signal and interference is performed according to the transmission gate. When no interference is performed within the preset first time, exit the interference window and enter the reconnaissance window again.
2. The method according to claim 1, characterized in that The local oscillator is switched in time within the reconnaissance window, and the PDW information is compared with the preset rejection signal library one by one, and then sorting is performed, including: Enter the reconnaissance window and compare the measured PDW information with the rejection signal library to eliminate signals of no interest; If there is still PDW information after the removal, the PDW information that has not been removed is sorted and processed.
3. The method according to claim 2, characterized in that The sorting process of the PDW information that has not been eliminated includes: Clustering based on pulse arrival angle, carrier frequency and pulse width; By accumulating histograms at all levels, the possible pulse repetition intervals in the original sequence are estimated and used as search intervals to perform sequence retrieval on the PDW information, and the PDW sequences belonging to the same radiation source are obtained respectively. Statistics and extraction of radiation source signal parameters after sorting; Complete the identification and classification of radiation source information after parameter analysis.
4. The method according to claim 2, characterized in that The step of comparing the sorted PDW information with the high-threat signal library and switching to the local oscillator output reconnaissance information corresponding to the high-threat information includes: Matching the sorting processing results or PDW information corresponding to the multiple local oscillators with the high-threat signal library; The local oscillator corresponding to the information with a higher threat level is selected; the threat level is determined by the repetition rate, and the higher the repetition rate, the higher the threat level.
5. The method according to claim 4, characterized in that The local oscillator corresponding to the information with a higher threat level is specifically selected as follows: When only one local oscillator has information, the local oscillator with information is selected; When there are multiple local oscillators with information, the local oscillator with higher threat level information is selected; When there is no local oscillator information, scan again.
6. The method according to claim 5, characterized in that The rejection signal library includes known friendly force signals and interference signals in the environment; the high-threat signal library includes known high-threat target signals.
7. The method according to claim 5, characterized in that The interference pattern within the interference window is intermittent sampling within the pulse.
8. The method according to claim 7, characterized in that The frequency information of the radar signal is measured within the interference window. If the frequency information matches the reconnaissance information or the high-threat signal library, a sampling gate is raised to sample the signal, and interference is performed according to the transmission gate, including: When the sampling window is pulled up, the frequency information of the measured signal is compared with the reconnaissance information and high-threat information database in real time; when the frequency information matches the reconnaissance information or high-threat information database, the sampling gate is pulled up to sample the signal; Transmitting an interference signal according to a transmitting wave gate; After the pulse width information is obtained, the pulse width information and frequency information are combined and compared with the reconnaissance information and high-threat information database; if there is no match, the frequency information will not be responded to within the subsequent preset second time.
9. The method according to claim 8, characterized in that The pulse width information is determined by the fusion gate, which is formed by the fusion of the sampling gate and the emission gate.