Joint estimation method for azimuth angle and elevation angle of signal on basis of L-type sensor array

Abstract

The invention discloses a joint estimation method for an azimuth angle and an elevation angle of a signal on the basis of an L-type sensor array. The joint estimation method is used for estimating a direction of arrival of an incidence signal emitted onto the L-type sensor array, wherein the L-type sensor array is placed on an x-z plane and is provided with two mutually vertical uniform linear arrays, and M omnidirectional sensors are equidistantly arranged in different spatial positions along a straight line on each of the uniform linear arrays. The joint estimation method is characterized by comprising the following steps: (1) estimating a covariance matrix of signals received by two rows of uniform linear arrays on x axis and z axis, and then obtaining an M*2M expanding cross covariance matrix by calculating according to the covariance matrix of the signals received by the two rows of uniform linear arrays; (2) cutting the uniform linear array on the z axis or x axis into two rows of non-coincident forward/backward sub-arrays, and then estimating the elevation angle by utilizing the expanding cross covariance matrix of data received by the two rows of uniform linear arrays according to a linear operation one-dimensional subspace method; and (3) estimating a corresponding azimuth angle by linearly operating by utilizing feasible regions of the azimuth angle and the elevation angle, the two rows of sub-arrays on the z axis or x axis and the cross covariance between one of the sub-array and the uniform linear array on the x axis or z axis.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a two-dimensional direction-of-arrival estimation, a segmented L-shaped array, which uses cross-correlation to estimate elevation angles, and then uses the estimated elevation angles to calculate corresponding azimuth angles. Background technique [0002] Array signal processing is an important branch of signal processing, which is closely related to parameter estimation, system identification, adaptive filtering, statistical signal processing, and matrix theory, and is used in radar, sonar, communication, seismic data processing, and medical imaging. It is widely used in many fields. Practical applications of array signal processing include radar, sonar, communications, etc., where the two-dimensional (2-D) direction of arrival (DOA) (eg, azimuth and elevation) of multiple incident signals must be estimated from numerous measurements. As the number of dime...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for joint estimation of signal azimuth and elevation based on an L-shaped sensor array, which solves the problem that the two-dimensional direction of arrival estimation in the prior art has a large computational complexity, often cannot provide correct matching results, and cannot be applied problems in real-time environments

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