Single-channel spatial spectrum direction finding method based on phased array

Abstract

The embodiment of the invention provides a single-channel spatial spectrum direction finding method based on a phased array. A plurality of direction finding antennas and analog phase shifters are included. The number of the analog phase shifters is the same as that of the antennas, each direction finding antenna is connected with an analog phase shifter, an analog signal output by each analog phase shifter is combined by a combiner and then sent to an ADC for sampling, and a sampling result is sent to a direction finding receiver, and the method specifically comprises the following steps: S1,estimating a spatial covariance matrix by scanning a plurality of predetermined azimuth directions; S2, performing eigenvalue decomposition on the spatial covariance matrix to obtain a noise space base vector; and S3, obtaining incoming wave signal estimation through spectral peak search based on the noise space base vector. The embodiment of the invention provides the single-channel spatial spectrum direction finding method based on the phased array, the cost and the design complexity of a system are further reduced, and the application range is wider.

Description

technical field [0001] The invention relates to the technical field of electronic information, in particular to a single-channel spatial spectrum direction finding method based on a phased array. Background technique [0002] The radio direction finding system is an important part of the radio monitoring system, and has very important applications in both military and civilian fields. As a new type of radio direction finding system, the spatial spectrum direction finding system is a new type of radio signal direction finding system. It not only has high direction finding resolution and sensitivity, but also can measure multiple signals on the same frequency. It is the future development direction of the radio monitoring system. The spatial spectrum direction finding system mainly relies on subspace signal processing technology to achieve high resolution direction finding. In terms of system hardware, this requires that the direction-finding receiver must be equipped with t...

AI Technical Summary

Problems solved by technology

The introduction of multiple variable gain amplifiers not only increases the cost of the system, but also further increases the difficulty of system development; at the same time, for some phased array systems without variable gain amplifiers, since each branch only has analog phase shifters , it is impossible to adjust the magnitude of the weight coefficients of each branch, so the method based on the disturbance vector cannot be applied to this type of phased array system

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