An Airborne Radar Anti-jamming Method
An airborne radar, jamming frequency technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of radar frequency agility, falling into the jamming range, unable to completely avoid the jammed frequency points, etc., and achieve the impact of weight indicators. The effect of small size, simple processing method, and fast frequency selection
Active Publication Date: 2022-04-01
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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[0004] The purpose of the present invention is to provide an airborne radar anti-jamming method, which is used to solve the problem in the prior art that when the radar performs frequency agility, it may fall into the interference range and cannot completely avoid the interfered frequency point
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[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention.
[0035] At present, the anti-jamming of airborne radar can be carried out by means of frequency agility. When the radar performs frequency agility, it cannot completely avoid the interfered frequency point. For the above problems, the present invention proposes an active anti-jamming method based on frequency monitoring. This method needs to form an additional channel signal on the antenna unit of the radar, and perform intermediate frequency broadband sampling on the signal, and then perform frequency detection on the non-coherent spectrum data of the signal in the frequency domain to effectively separate the interfered frequency The effective selection of frequency hopping frequency p...
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The invention relates to an airborne radar anti-jamming method, which comprises: obtaining two summation signals generated by the airborne radar, wherein any summation signal is subjected to down-conversion processing to obtain an intermediate frequency signal; digital sampling is performed on the intermediate frequency signal to obtain Sampling data; performing Fourier transformation on the sampling data to obtain a frequency domain signal; setting a sliding window on the frequency domain signal, calculating the average noise in the frequency domain signal with the width of the sliding window, according to the The average noise and the fixed noise determine the signal-to-noise separation threshold of the frequency domain signal within the sliding window; determine the interference frequency range according to the signal-to-noise separation threshold; remove the interference frequency range from the frequency hopping candidate frequency set to obtain the non-interference frequency range, If the hopping frequency point falls within the non-interference frequency range, the hopping frequency point has no interference; repeat the above steps to obtain all the hopping frequency points. The invention can perform self-adaptive frequency hopping on the frequency of the agile frequency, and improves the anti-jamming ability of the radar.
Description
technical field [0001] The invention belongs to the technical field of radar anti-jamming, in particular to an airborne radar anti-jamming method. Background technique [0002] When the airborne radar is performing flight missions, it usually suffers interference from the enemy's electronic countermeasure equipment, which interferes with the normal operation of the radar and reduces the working performance of the radar. In order to reduce the jamming effectiveness of the enemy's electronic countermeasure equipment, the radar will use frequency agility to perform frequency hopping processing. The frequency point selection of frequency hopping is usually random, so when faced with the interference of electronic countermeasure equipment such as aiming and scanning, the radar has a high probability of jumping to the interfered frequency, thus affecting Radar work efficiency. [0003] Therefore, it is necessary to monitor the interference frequency point, and usually choose to ...
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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 赵衡安兴吴振有
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA