Airspace interference signal detection method and device

Abstract

The invention discloses an airspace interference signal detection method and device, and relates to the field of array signal processing. The method is realized through the following technical scheme:based on an FPGA chip parallel hardware processing architecture, forming a data covariance matrix through employing array sampling signal data, obtaining a spatial spectrum value based on an MVDR algorithm, and forming a two-dimensional spatial spectrogram; and then, employing the AGC value for assisting spatial spectrum search to realize interference coming direction detection; meanwhile, performingdigital AGC reverse detection on the interference power which changes rapidly, thus acquiring an interference power value, and therefore the detection result of interference information is enriched. According to the method, a steering vector is obtained in a preprocessing mode and spectral peak calculation is converted into spectral valley calculation, so that the complexity of implementationis further reduced; finally, a spatial spectral noise bottom threshold and a local maximum value are used for jointly judging to replace eigenvalue solution of a sampling data covariance matrix to judge the number of interferences, so that detection of the number of interferences is obtained, and engineering application is efficient and feasible.

Description

technical field [0001] The present invention relates to the field of array signal processing, and more specifically, to a method and device for detecting airspace interference signals in the field of array signal processing. Background technique [0002] In a complex electromagnetic environment, communication equipment is susceptible to interference from various forms of intentional or unintentional signals including monotone, narrowband, and broadband. How to effectively suppress interference and improve the quality of signal reception has always been a special concern in the application fields of radar, communication, navigation and sonar. When the radar is in a strong active interference environment, the probability of the interference signal entering the receiver from the side lobes of the antenna is very high, and sometimes it can overwhelm the target signal, causing the radar to fail to work normally. In order to reduce or eliminate the impact of interference signals ...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the prior art airspace interference detection method has poor interference direction estimation resolution and inaccurate interference number estimation, especially based on the detection and processing architecture of the spatial spectrum construction and spectral peak search of the DSP chip, which cannot Meet the complexity requirements of large-scale array spatial spectrum construction and the real-time requirements of spectral peak azimuth and elevation two-dimensional domain search

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