Research on anti-jamming technology of chaotic composite short range detection based on singular spectrum analysis

摘要

The chaotic compound short-range detection system is a new type of short-range detection system. The system uses the “determinacy” and “randomness” of the chaotic to realize the further phase modulation of the FM detection signal, and then realizes the function of system velocity and ranging. In the process of system operation, all kinds of strong suppressive jamming pose a serious threat to the detection system. It is urgent to study a new anti-jamming method of chaotic compound short-range detection system. In order to extract the different characteristics between the jamming signal and the target echo signal so as to realize the anti-jamming of the chaotic compound short-range detection system, the paper separates the target echo from the target echo mixed with four different types of jamming signals blindly, decomposes the separated echo and jamming signals by singular value decomposition, and distinguish the echo signal from the jamming signal through compares the value of signals singular, the number of non-zero singular value, the distribution of singular value and the singular spectrum entropy. At the same time, the recognition between different jamming signals can be realized. The recognition accuracy is high and the real-time performance is good.