Multi-dimensional information joint radio frequency interference suppression method and system

Abstract

The invention provides a multi-dimensional information joint radio frequency interference suppression method and system, and the method comprises the steps: 1, carrying out the modeling analysis of the existing P-band potential interference, and obtaining an analysis result; 2, obtaining characteristics of continuous radio frequency interference, narrowband radio frequency interference and pulse radio frequency interference according to an analysis result; 3, processing the narrowband radio frequency interference in combination with the time-frequency domain dimension and the prior information; and 4, segmenting the pulse-type radio frequency interference signal in a time domain, converting the pulse-type radio frequency interference signal into continuous radio frequency interference for processing, and splicing the processed segments to obtain an echo signal after interference suppression. According to multi-dimensional joint radio frequency interference suppression system, the loss of useful echo signals is reduced, and the robustness of the performance of the radio frequency interference suppression algorithm of the P-band SAR system is improved.

Description

technical field [0001] The present invention relates to the technical field of radio frequency interference suppression, in particular to a method and system for radio frequency interference suppression of multi-dimensional information combination. Background technique [0002] P-band SAR satellites not only have the advantages of spaceborne SAR all-day, all-weather, and large-scale earth observation, but also have the advantages of P-band radar with strong penetration ability to foliage and shallow ground surface. Effectively obtain global biomass, high-precision ionospheric TEC data, soil moisture, and glacier monitoring data, thereby greatly enriching and improving human perception and detection capabilities of the surrounding living environment; as a space-based system with global environmental monitoring capabilities, It is an indispensable and important part of the future development of national civil satellites. However, SAR operating in the P-band is easily interfer...

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Problems solved by technology

However, SAR operating in the P-band is easily interfered by electromagnetic signals from other civil radio equipment such as TV networks and communication networks in the same band, which seriously affects the imaging quality of the SAR system and brings difficulties to subsequent SAR target detection, tracking and identification processing. , radio frequency interference suppression is one of the key technologies in the development of P-band satellites

[0003] At present, most of the existing research and inventions use interference suppression processing methods for a single variable domain based on eigenvalues, oblique projection filtering, space-frequency cascade filtering, and compressed sensing, such as patent document CN103675768A (application number: CN201310693687.7), Patent document CN106501781A (application number: CN201610965930.X), patent document CN106646472A (application number: CN201611260024.6), etc., and for the diversity and complexity of satellite-borne P-band SAR interference signals, in the time domain, frequency domain, and time-frequency The domains are highly overlapping, and the overlapping degree in the statistical information domain (feature subspace) is also high. The sidelobe characteristics brought about by pulsed radio frequency interference make the processing more difficult, making the existing interference suppression processing for a single variable domain Algorithms (such as Notch frequency domain notch method, eigensubspace method, STFT and WT method, etc.) fail

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