Direction finding method for two dimensional plane annular array

Abstract

The invention discloses a direction finding method for a two dimensional plane annular array, which is used for solving the problem of big array direction finding errors caused by the fact that an angle estimation model and an object are positioned in different partial positions The direction finding method comprises steps of calculating an azimuth of each array element in the array to obtain an azimuth sequence, obtaining a distance difference vector of a radiation source object distance array and a reference array element, successively choosing each array element as a temporary reference array element, performing respective azimuth pre-estimation on the radiation source object, performing precision estimation on the object azimuth to obtain an azimuth precision estimation value, and performing precision estimation on an object pitch angle to obtain precision estimation value of the pitch angle. The direction finding method disclosed by the invention effectively utilizes the optimal reference array element to realize the precision direction finding of the object signal according to the spatial position where the object is positioned, reduces the angle estimation error caused by the angle definition and the different spatial positions of the estimation model and the object, and improves the angle estimation performance of an omni-directional object.

Description

technical field [0001] The invention belongs to the technical field of array direction finding, and in particular relates to a direction finding method capable of improving the estimation accuracy of a two-dimensional plane circular ring array. Background technique [0002] Array direction finding technology based on phase difference measurement and time difference of arrival measurement method is widely used in radar, communication, microphone array and other electronic systems. Due to the good symmetry of the circular array in the planar array, it is widely used in the array direction finding of the two-dimensional angle of the target. The simplest circular arrays include equidistant triangular arrays, rectangular arrays, etc. Although the array direction finding performance will also be improved with the increase of the number of array elements, but due to the influence of the array direction finding model and measurement parameter errors, for two-dimensional angle estim...

AI Technical Summary

Problems solved by technology

Although the array direction finding performance will also be improved with the increase of the number of array elements, but due to the influence of the array direction finding model and measurement parameter errors, for two-dimensional angle estimation, when the target incoming wave direction is close to the array normal When the incoming wave direction is close to the direction of the front, the estimation error of the target's pitch angle is relatively large.

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