Two-dimensional DOA estimation method based on rooting Capon

Abstract

The invention discloses a two-dimensional DOA (Direction of Arrival) estimation method based on rooting Capon. The method comprises the following steps of: firstly, receiving signals by double parallel arrays and sampling the signals; secondly, solving a covariance matrix for the sampled signals to obtain a two-dimensional Capon spatial spectrum function related to the covariance matrix; thirdly, taking an improved formula of a denominator of the spatial spectrum function as a cost function of a rooting Capon algorithm, and converting the cost function into a one-dimensional polynomial; and finally, rooting the one-dimensional polynomial, and obtaining the elevation angle and the azimuth angle of the automatically paired signal source by using the corresponding relation of the two-dimensional angles. According to the method, the problem of huge calculation amount caused by spectral peak search of a two-dimensional Capon algorithm is solved, meanwhile, the advantage that the Capon algorithm does not need priori information of the information source number is inherited, DOA estimation time is shortened, the estimation efficiency of the information source direction is effectively improved, and the method can be well applied in practice.

Description

technical field [0001] The invention relates to the technical field of DOA estimation, in particular to a two-dimensional DOA estimation method based on root-finding Capon. Background technique [0002] Array signal processing is an important branch of signal processing, and has achieved rapid development and wide application in the fields of communication, radar, sonar, seismic exploration and astronomy. Array signal processing uses sensor arrays distributed in a certain way to receive spatial signals and process them, with the purpose of extracting useful information from the signals. DOA estimation, that is, the problem of the direction of arrival of space signals, is a basic problem in array signal processing. It is also one of the important tasks in many fields such as radar and sonar. Its content is to determine one or more The location of the target signal (the direction angle at which each signal arrives at the reference element of the array, that is, the direction ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a two-dimensional DOA estimation method based on root-finding Capon for the defects of the background technology, and to use a one-dimensional polynomial root-finding method to avoid the need for complex two-dimensional spectral peak searches in the classic Capon algorithm problem, greatly reducing the amount of calculation for DOA estimation, and improving the efficiency of estimating the source location

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