Method for suppressing non-stationary blanket interference signal in satellite navigation system

Abstract

A method for suppressing a non-stationary blanket interference signal in a satellite navigation system comprises the steps that when a blanket interference signal, a satellite signal and a noise signal coexist, an array signal to be processed is formed through an M-element even linear array; discrete sampling is conducted on a whole interference signal originating space and an array signal sparse representation model is obtained; coherent processing is conducted on sparse representation model data and guide vectors at all possible angles and the position of the maximum value of the coherent quantity in the guide vector matrix is found; a sparse vector corresponding to the maximum value of the coherent quantity is estimated through the least square method; the sparse vector is subtracted from the sparse representation model data and a surplus is obtained; whether interference components are completely suppressed or not is judged, if the conduction that the interference components are completely suppressed is not satisfied, repeated iteration is conducted, a first element of a surplus vector serves as data after current snapshot interference suppression, and satellite tracking and locating are conducted. According to the method, the number of interference signals does not need to be known in advance, mismatch of a DOA sampling interval is insensitive, and interference with the DOA interval smaller than a resolution ratio can be processed.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation interference signal suppression, in particular to a non-stationary suppressive interference signal suppression method in a satellite navigation system. Background technique [0002] Based on satellite navigation, it can accurately provide information such as target position and time. Nowadays, satellite navigation plays an important role in many fields of civil and military use, such as GPS navigation and Beidou navigation. However, since the navigation satellite is about tens of thousands of kilometers away from the earth, the satellite signal received by the satellite receiver near the ground will be very weak, generally 20dB lower than the thermal noise of the receiver, which will make the satellite signal vulnerable to interference If the interference signal suppression is not carried out, the performance of satellite navigation will be reduced, and the navigation ability will be ...

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Problems solved by technology

[0004] At present, the relatively mature anti-jamming methods based on array processing all use the statistic of the covariance matrix of the received satellite signal data. Therefore, the covariance matrix must be accurately estimated during processing. The number and the DOA of the interference signal remain unchanged for a certain period of time. However, if the interference signal is a non-stationary suppressive interference signal, because its covariance matrix is ​​time-varying, the covariance matrix cannot be accurately estimated. Therefore, All anti-interference methods based on covariance matrix processing will fail

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