MUSIC algorithm based frequency diverse array two-layer medium target positioning method

Abstract

The invention discloses a MUSIC algorithm based frequency diverse array two-layer medium target positioning method, which is characterized in that a transmitting-receiving beam direction pattern of a frequency diverse array of the two-layer medium is derived through determining a propagation path of electromagnetic waves in a two-layer medium; received echo waves are enabled to contain decoupled distance and angle information through two groups of different frequency deviations, and an estimated value of an echo signal covariance matrix is acquired according to snapshot data of L echo signals; eigenvalue decomposition is performed on the acquired estimated value, eigenvalues which are equal to the number of target sources K and corresponding eigenvectors are regarded as a signal subspace according to the size of eigenvalues, and the left 2N-K eigenvalues and eigenvectors are regarded to be a noise subspace; and a spectral function is constructed according to the noise subspace, and point-by-point computation is performed on distance and angle variations so as to find the wave crest and estimate the target location. The method disclosed by the invention realizes positioning for a shielded target in a multi-layer medium under a single transmitting single receiving mechanism of each array element of RDA radar by using a MUSIC algorithm.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a MUSIC algorithm-based two-layer medium target positioning method of a frequency diversity array (Frequency Diverse Array, FDA). Background technique [0002] Compared with the ordinary uniform linear array, the frequency diversity array has a frequency increment between adjacent array elements (required to be much smaller than the reference carrier frequency), and its pattern is related to time, angle and distance. The beam pattern of the frequency diversity array depends on the characteristics of both distance and angle, which increases the degree of freedom of the system and has caused a lot of research in the field of radar. It has great advantages in applications such as multi-target positioning and multi-tasking processing. [0003] Radar imaging technology has a wide range of application requirements in both military and civilian fields. In the actual d...

AI Technical Summary

Problems solved by technology

The traditional method achieves target positioning through inverse scattering, which needs to calculate the complex layered medium Green's function and use the functional method to reduce the error. The calculation method is complicated, and the error is still high, which cannot effectively locate the occluded target in the multi-layer medium.

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