Self-adaptive channelized receiving method based on frequency spectrum difference entropy detection

Abstract

The invention relates to a self-adaptive channelized receiving method based on frequency spectrum difference entropy detection, and belongs to the technical field of radar signal reconnaissance and signal detection. For received broadband Chirp signals, narrowband Chirp signals and two-phase coded signals, a channelization structure based on an odd-type multi-phase filter group and an even-type multi-phase filter group is used for carrying out first-level channelization receiving, and smoothing processing, false signal elimination, differential entropy detection, wide and narrow signal judgement and parameter estimation are carried out on frequency spectrum energy of the received signals, so that the number of cross channels, and signal parameters are obtained; channel matching is performed according to the number of cross channels, and a channelization structure with a small number of cross channels is selected; and according to the signal parameters, secondary channelization receiving is carried out, channel combination is carried out on broadband signals, adaptive frequency band subdivision is carried out on the narrowband signals, secondary channel detection is carried out, and effective signals are extracted. The method has the advantages of full-probability receiving, high real-time performance, high detection accuracy, capability of detecting low-signal-to-noise-ratio complex signals and strong noise filtering capability.

Description

technical field [0001] The invention relates to an adaptive channelization receiving method based on spectrum differential entropy detection, and belongs to the technical field of radar signal reconnaissance and signal detection. Background technique [0002] In modern high-tech electronic warfare, the number of unknown radiation sources in the complex electromagnetic space is large, the signal forms are various, the signal frequency distribution range is wide, and the noise is large, which makes it difficult to collect battlefield electromagnetic environment information. Traditional digital receivers must use high-speed DSP to process high-speed ADC sampling data, but the current DSP has low data processing efficiency, and data loss will occur, which does not meet real-time performance. The digital channelization receiver based on polyphase filter is an efficient data rate reduction technology. It can not only match the data processing speed of ADC and DSP, but also put all...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that when the existing channelization method based on analysis and synthesis filter banks is used to receive radar signals, it cannot process narrowband and broadband signals at the same time, and it is easy to cross channels when receiving narrowband signals and it is difficult to further subdivide frequency bands. Due to the technical problem of low detection accuracy under low signal-to-noise ratio, an adaptive channelization receiving method based on spectrum differential entropy detection is proposed

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