Phase interferometer direction finding method for ambiguity resolution by extension baselines

Abstract

The invention belongs to the technical field of communication radar. An equilateral triangular array is selected as a rough measurement array in a circular array, the phase difference between two baselines in a triangular matrix is calculated, and possible actual phase differences are exhaustively listed according to the maximum ambiguity degree; the possible actual phase differences are substituted to a circular array phase difference solving formula to build a phase difference vector sample library; the ambiguity degree of the actual circular array phase difference is obtained by a related operation, and further an actual circular array phase difference vector is obtained; and finally, an incident angle value as an accurate DOA (Direction of Arrival) estimate is inversely solved by finding the least squares solution of direction cosine. The novel phase interferometer two-dimensional direction finding algorithm for ambiguity resolution by extension baselines is applied, so that higher precision can be obtained compared with a direction finding algorithm based on a related operation, and the required amount of computation is greatly reduced. The method is a high-performance angle measurement algorithm.

Description

technical field [0001] The invention belongs to the technical field of communication radar, in particular to a phase interferometer direction finding method in radio monitoring. Background technique [0002] In the existing direction finding system, phase interferometer direction finding has the advantages of passive direction finding, high direction finding accuracy, high sensitivity, good real-time performance, etc., and can be applied to various antenna array forms, so it is widely used in electronic reconnaissance field direction finding system. In the military field, it can locate radiation sources such as radar, communication, and measurement and control, and can play an important role in the implementation of targeted electronic jamming and military strikes; in the civilian field, it can be used for traffic control, life rescue, and radio spectrum management etc. [0003] In phase interferometer direction finding, the multi-valued phase or ambiguity is the key issue...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of inaccurate direction finding and high calculation amount caused by the low utilization of array element information in the correlation method used in the phase interferometer direction finding in the prior art

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