A spatial filtering method based on direction finding equipment

Abstract

The invention discloses a spatial filtering method based on direction-finding equipment, which includes converting radio frequency signals received by an antenna array into IQ data streams of each array element; calculating the covariance matrix R of the IQ data streams, and using a spatial spectrum direction-finding algorithm to The direction finding results are obtained by performing direction finding on the same-frequency signals of the IQ data stream; using the covariance matrix and the direction finding results, the actual array manifolds corresponding to the signals in each direction are calculated respectively, and the actual array manifolds are the signals in each direction in each The vector formed by the complex gains generated by the array elements; the composite coefficient matrix is ​​calculated according to the actual array manifold corresponding to the signal in each direction; the IQ data stream of each array element is multiplied by the composite coefficient matrix to generate a composite signal. The invention has lower requirements on hardware; the calculation method has high timeliness; the synthesized coefficients of each signal only need to be updated once regularly; and the efficiency of interference search in radio monitoring work is improved.

Description

technical field [0001] The invention relates to the technical field of radio monitoring, in particular to a method for airspace filtering based on direction finding equipment. Background technique [0002] Spatial filtering refers to a technology in which beamforming uses the spatial separation of signals from different directions to realize signal spatial processing when several signals superimposed together in the time domain occupy the same frequency band. In practical applications, monitoring equipment can only separate multiple radio signals through differences in the frequency domain; while direction-finding equipment can only give the direction of each signal, and cannot separate from the signal level, so it is impossible to separate each signal. Demodulate separately to determine the individual characteristics of each signal. At present, there are few monitoring and direction-finding equipment capable of airspace filtering, mainly for the following reasons: [0003...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a spatial filtering method based on direction-finding equipment, which is used to solve the problem that the direction-finding equipment in the prior art cannot perform signal separation from the signal level and the implementation method of spatial filtering in the prior art is limited by the array elements. Quantity and poor consistency of antenna amplitude gain and complex issues

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