Electromagnetic vector array based angle estimation method for metric-wave radar

Abstract

The invention discloses an electromagnetic vector array based angle estimation method for metric-wave radar. The method is realized through adopting the following steps: (1), receiving radar return through adopting the electromagnetic vector array, and mixing the radar return to a base band for discrete sampling; (2), building a second-order statistical matrix through data obtained from the discrete sampling; (3), performing singular value resolving for the second-order statistical matrix, so as to obtain a left signal characteristic matrix; (4), building a pencil of matrix through utilizing the left signal characteristic matrix; (5), performing extended-feature value resolving for the pencil of matrix, so as to obtain an extended-feature vector matrix, an extended-feature value matrix and an extended-feature value, and calculating a poynting vector of a radar return signal through adopting the parameters; and (6), calculating a two-dimensional angle of an object as per the obtained extended-feature value and the poynting vector of the radar return signal. Under the circumstance that the one-dimensional linear array is adopted, the method can be used for estimating the two-dimensional angle, has the array element spacing larger than the half wavelength, has small computation, facilitates engineering realization, and can be used for the estimation of the two-dimensional angle of the object through the metric-wave radar.

Description

Technical field [0001] The invention belongs to the field of radar technology, and specifically is a method for estimating the direction of arrival of coherent signals, and can be used for meter wave radar to estimate the two-dimensional angle of a target. Background technique [0002] The electromagnetic vector array is an array composed of electromagnetic vector array elements. A complete electromagnetic vector array element is composed of 3 electric dipoles and 3 magnetic dipoles with a common configuration and orthogonal polarization directions. It can simultaneously induce 3 electric field transient components and 3 incident electromagnetic fields. The transient component of the magnetic field. Compared with the traditional scalar array, the electromagnetic vector array can obtain more detailed information of the incident signal. [0003] Angle estimation is a basic function of meter wave radar. However, when detecting a low-elevation target, the radar beam hits the ground,...

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Problems solved by technology

[0004] 1. Using a one-dimensional linear array can only estimate one-dimensional angles. When estimating two-dimensional angles at the same time, a two-dimensional planar array is required, which increases the volume occupied by the array;

[0005] 2. In order to avoid angular ambiguity, the array element spacing must be less than or equal to half a wavelength. When the array aperture is larger, the number of array elements required is more, and the system complexity is higher;

[0006] 3. Since angle search is required, the higher the search accuracy requirement, the greater the amount of calculation

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