Method of confronting active deception jamming by multi-station radar

Abstract

The invention discloses a method of confronting active deception jamming by a multi-station radar. The method mainly comprises steps: after any node radar is selected to carry out matched filter and target detection on a receiving signal, K+M point targets are obtained, the first node radar serves as a reference radar, time alignment operation is carried out on the K+M point targets and the other N-1 node radars, and an echo amplitude corresponding relation between point targets detected by the N-1 node radars and point targets detected by the reference radar is obtained; echo amplitude of the pth point target on the nth node radar is selected, an amplitude ratio feature vector of the pth point target is obtained, false target determination is set to be a false alarm rate for a real target, a discrimination threshold theta for the N node radars is obtained, the amplitude ratio feature vector omegap of the pth point target is classified to be the pth class, and K+M different classes are obtained, clustering operation is carried out, and a final clustering result is acquired; and finally, a determination threshold value epsilon for false point targets is set, and the false point targets included in the final clustering result are acquired.

Description

technical field [0001] The invention relates to the technical field of radar anti-jamming, in particular to a method for resisting active deceptive jamming of multi-station radar, which is suitable for a data fusion center of a networked radar system to effectively identify and eliminate deceptive false targets and realize multi-station radar system confrontation Deceptive jamming. Background technique [0002] Electronic spoofing technology is dedicated to deceiving the victim radar in terms of direction, position, tracking starting point and other information, or to create many false targets around the real target echo so that the real target information cannot be extracted. An effective category of spoofing techniques is deceptive spoofing techniques, the purpose of which is to deceive the amplitude, phase, etc. of the radar received echo by modulated transmission or forwarding, especially digital radio frequency memory. (DRFM), that is, the emergence of advanced repeate...

AI Technical Summary

Problems solved by technology

However, since each node radar in the multi-station radar will be subject to deceptive interference, dense false targets will lead to a high error rate in the correlation test between the measurement values ​​of each node radar, and the location of the multi-station radar is not ideal. also affects the ability of multi-station radars to counter deceptive jamming

[0004] Most of the existing multi-station radars use data-level fusion to counter deceptive jamming. In the process of multi-station radar measurement of targets, only the point track information or track information of the target is used, so that the data-level fusion anti-jamming The method cannot fully exert its anti-interference ability, and thus cannot make full use of the advantages of multi-station radar

[0005] The existing anti-spoofing jamming method is a signal-level fusion method. Although it can make full use of various information of target echoes, it also has many limitations and deficiencies. This signal-level fusion method uses the information of real target echoes in different radar stations. The complex envelopes are independent of each other and the interfering signal complex envelopes are correlated to distinguish true and false targets. The identification effect depends on the number of pulse repetition periods (PRT) in the slow-time complex envelope sequence. In the actual radar working environment, The number of available pulse repetition periods (PRT) is very limited, and even only one pulse repetition period (PRT) can be used, making the method of signal correlation detection completely invalid at this time

At the same time, it is very likely to identify the slow undulating true target as a false target

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