Two-dimensional DOA estimation method based on L-shaped interference type linear array

Abstract

The invention belongs to the technical field of interference type array DOA estimation, and particularly relates to a two-dimensional DOA estimation method based on an L-shaped interference type linear array. The method comprises the following steps that a three-dimensional rectangular coordinate system is established by using the L-shaped interference type linear array as the datum; mutual correlation matrixes Rxz, xz and zx of x-axis receiving signals and z-axis receiving signals are obtained; in accordance with the Rxz, xz and zx, a linear operator Px and a linear operator Pz are obtained; according to the linear operator Px and the linear operator Pz, the coarse estimated value of each incidence signal azimuth angle and the coarse estimated value of each incidence signal pitch angle are searched for by using alpha as the search step size within the search angle range of 0-180 degrees; refined estimation values corresponding to the incidence signal azimuth angles are searched for by using beta as the search step size within each search region in azimuth angle refined estimation, and refined estimation values corresponding to the incidence signal pitch angles are searched for by using beta as the search step size within each search region in pitch angle refined estimation; according to the refined estimation value of each incidence signal pitch angle, and the refined estimation values of the paired incidence signal azimuth angles are acquired.

Description

technical field [0001] The invention belongs to the technical field of interferometric array angle-of-arrival estimation, in particular to a two-dimensional angle-of-arrival (Direction of Arrival, DOA) estimation method based on an L-shaped interferometric linear array, which can be used for target positioning and tracking. Background technique [0002] As we all know, the angular resolution and angular measurement accuracy of the array are proportional to the aperture of the array. Generally, the angular resolution and angular measurement accuracy of the radar can be improved by increasing the array aperture. However, increasing the array aperture makes the radar severely limited in terms of cost, engineering realization, and mobility, and the array antenna with a large aperture is not conducive to the radar's own stealth and high mobility requirements, which also reduces the radar's anti-destruction and battlefield survivability. In order to reduce costs, meet the require...

AI Technical Summary

Problems solved by technology

Due to the need for eigenvalue decomposition of the dual-scale ESPRIT algorithm, the amount of computation increases rapidly when the number of array elements increases; the staggered baseline method is only suitable for estimating the angle of a single target due to the limitation of the algorithm itself, and the algorithm fails in the case of multiple targets

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