Method and system for radio frequency interference suppression based on multi-dimensional information union

Abstract

The present invention provides a multi-dimensional information joint radio frequency interference suppression method and system, including: Step 1: Modeling and analyzing the existing P-band potential interference to obtain the analysis result; Step 2: Obtaining the continuous formula based on the analysis result Characteristics of radio frequency interference, narrowband radio frequency interference, and pulsed radio frequency interference; step 3: for narrowband radio frequency interference, combine time-frequency domain dimensions and prior information for processing; step 4: segment pulsed radio frequency interference signals in the time domain , transforming into continuous radio frequency interference for processing, and splicing the processed segments to obtain the echo signal after interference suppression. The invention proposes a combined multi-dimensional radio frequency interference suppression system, which reduces the loss of useful echo signals and improves the robustness of the performance of the P-band SAR system radio frequency interference suppression algorithm.

Description

technical field [0001] The present invention relates to the technical field of radio frequency interference suppression, and in particular, to a radio frequency interference suppression method and system for combining multi-dimensional information. Background technique [0002] The P-band SAR satellite not only has the advantages of spaceborne SAR for all-day, all-weather, and large-scale earth observation, but also has the advantage of the P-band radar's strong ability to penetrate leaves and shallow surfaces. Effectively obtain data on global biomass, high-precision ionospheric TEC data, soil moisture, and glacier monitoring, 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, the SAR operating in the P-band is easily inter...

AI Technical Summary

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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