Extension aperture two-dimensional combined diagonalization DOA estimation method

Abstract

The present invention relates to the technical field of radars. In order to solve the problem of angle estimation invalidation in a real mobile communication pitch angle range with a pitch angle of 70-90 degrees, the problem of pairing of the pitch angle and an azimuth angle and the problem of a singular point in the traditional two-dimensional DOA estimation, the extension aperture two-dimensional combined diagonalization DOA estimation method is implemented by employing a heterogeneous array, and comprises the steps of: (1) constructing a delay cross correlation matrix; (2) constructing a selection matrix to obtain four diagonal matrixes; (3) obtaining a z-axis direction cosine estimated value with low precision and without ambiguity and a z-axis high-precision direction cosine estimatedvalue with ambiguity; (4) obtaining two direction cosine estimated values on the x axis in a similar way; and (5) obtaining direction cosine estimated values with low precision and without ambiguitythrough adoption of an ambiguity-resolving method as shown in the description; and (6) obtaining estimated values of the pitch angle and the azimuth angle and a value as shown in the description. Theextension aperture two-dimensional combined diagonalization DOA estimation method is mainly applied to the DOA occasions for estimation of the received signals.

Description

technical field [0001] The invention relates to the technical field of estimating the direction of arrival of received signals by using an array antenna, in particular to a method for estimating the direction of arrival of a signal using a non-uniform L-shaped antenna array with an expanded aperture. Background technique [0002] Space signal direction of arrival (Direction of Arrival, DOA) estimation is a main research direction of space spectrum estimation, which is widely used in radar, sonar, earthquake, communication and many other fields. The basic problem of DOA estimation is to determine the direction angle at which each signal arrives at the reference element of the array, referred to as the direction of arrival. Classical subspace decomposition DOA estimation algorithms include multiple signal classification algorithm (MUSIC, Multiple Signal Classification) and signal parameter estimation algorithm based on rotation invariant technique (ESPRIT, Estimation of Signal...

AI Technical Summary

Problems solved by technology

Some algorithms propose fuzzy algorithms, but because the algorithm itself is based on the ESPRIT algorithm, it has a large computational complexity

Another problem worth noting is that when a non-uniform array with an element spacing greater than half a wavelength is used for two-dimensional DOA estimation, even if there is no same azimuth or elevation angle, there will be the same direction cosine, that is, the singular point problem

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