Method for broadband networking radar to restrict narrow-band interference

Abstract

The invention discloses a method for a broadband networking radar to restrict narrow-band interference and mainly aims at solving the problem that an existing method is low in calculation efficiency. The method comprises the following steps: (1) initiating a launching signal waveform set S of the networking radar; (2) according to the information of narrow-band interference and reserved frequency bands in working frequency bands of the networking radar, calculating an information matrix R of trapped wave frequency bands so as to obtain a noise subspace matrix B of the information matrix R; (3) calculating an information auxiliary matrix gamma; (4) calculating a frequency domain information auxiliary matrix V; (5) recalculating the launching signal waveform set S' of the networking radar according to the information auxiliary matrix gamma and the frequency domain information auxiliary matrix V; (6) setting a terminating threshold value to be epsilon, if ||S'-S||F<2> >=epsilon, enabling S= S', and returning to the step (3), otherwise S' being the optimum launching signal waveform set, and utilizing the waveform set to conduct trapping waves in frequency bands where the narrow-band interference exists and finishing restriction to the narrow-band interference. The method improves calculation efficiency, reduces calculation complexity, and enables a waveform optimizing method to be effectively applied into the broadband networking radar.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for suppressing narrow-band interference by using wide-band networking radar. This method can be used in a networked radar system. By optimizing the waveform of the transmitted signal, the transmitted waveform of the radar at each node can obtain lower autocorrelation sidelobes and cross-correlation interference, and at the same time form a notch in the frequency band where narrowband interference exists to improve the bandwidth. Spectrum utilization of networked radars in congested frequency bands. Background technique [0002] Networked radar refers to an organic radar network formed by the unified deployment and processing of multiple radars by means of communication. When all radars work in broadband mode, it is called broadband networking radar. By optimizing the layout of multiple radars and using multi-waveforms and multi-frequency bands for cooperative detection ...

AI Technical Summary

Problems solved by technology

[0005] The first method is to design the filter at the receiver end of the radar signal to form a notch in the frequency band where the interference exists. The energy of the signal is lost

[0006] The second method is to directly optimize the design of the radar transmission signal so that it forms a notch at the interference frequency band, and use a filter at the receiving end to reduce its autocorrelation sidelobe, but the convergence speed of this method is slow, and in When the receiving filter constrains the main lobe to be constant, the output of the filter will have a problem of high peak side lobe level

However, the computational complexity of this method increases rapidly with the increase of the symbol length and the number of node radars. If this method is directly applied to broadband networked radars, its computational efficiency is not ideal

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