Direction-finding and defuzzification method for non-uniform circular array phase interferometer based on direction function

Abstract

The invention provides an ambiguity resolving method for phase interferometer direction finding of a non-uniform circular array based on a direction function. The traditional method has a technical problem of low successful ambiguity resolving probability caused by the difficulty of a stereo baseline method in resolving the mirror image ambiguity of an azimuth angle for a large-pitching-angle target. The method specifically comprises the steps of calculating the maximum ambiguity number of the baseline phase difference; writing out all ambiguity resolving phase difference combinations of a baseline set; calculating a direction function according to the ambiguity resolving phase different combinations; selecting baseline sets, and constructing a direction matrix; and selecting a reference baseline set to carry out ambiguity resolving, and calculating the pitching angle and azimuth angle. The ambiguity resolving method based on the direction function does not need to calculate the pitching angle or the azimuth angle in ambiguity resolving, thereby avoiding the problem of low phase ambiguity resolving success probability caused by low success probability of azimuth angle mirror imageambiguity resolving, improving the successful ambiguity resolving probability in the case of the large-pitching-angle target, and thus improving the direction finding performance.

Description

technical field [0001] The invention belongs to the technical field of communication and radar, in particular to a method for direction finding and defuzzification of a non-uniform circular array phase interferometer. Background technique [0002] The purpose of radio direction finding is to detect the incoming wave direction of the target radiation source, which is widely used in civil and military fields, such as mobile communication, radar, sonar, etc. Compared with other direction finding methods, the phase interferometer direction finding method has the advantages of simple structure and easy implementation. For two-dimensional direction finding, the circular array has a higher array space utilization rate than other formations. In most cases, a uniform circular array is generally used. However, in some special cases, such as mechanical interference between the array elements and other components, only non-uniform circular arrays can be used. [0003] The core techni...

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Problems solved by technology

[0004] The present invention aims at the existing stereo baseline method applied to the non-uniform circular array phase interferometer, which is difficult to resolve the image ambiguity of the azimuth angle for the target with a large elevation angle, and the technical problem that the probability of successful ambiguity is low is low. The present invention proposes a method based on the direction function The non-uniform circular array phase interferometer direction finding defuzzification method, the specific technical scheme is as follows:

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