Multiple source (Direction of arrival) DOA estimation method

Abstract

The invention belongs to the radio signal positioning technical field, and especially relates to a multiple source (Direction of arrival) DOA estimation method comprising the following steps: obtaining an array reception antenna signal output vector, and building a four-order cumulant matrix according to the signal output vector; carrying out extraction smoothing for the four-order cumulant matrixso as to obtain a new four-order cumulant matrix; decomposing characteristic constants of the new four-order cumulant matrix so as to obtain characteristic vectors corresponding to a noise subspace and a signal subspace; building a space spectrum function according to the characteristic vector of the noise subspace; returning , and increasing multi-snapshot numbers so as to obtain the space spectrum function corresponding to the snapshot number; smoothing the space spectrum function corresponding to each snapshot number; determining the DOA of a space signal source via peak spectrum searching. The method builds the four-order cumulant matrix, reduces the matrix dimensions, reduces operand, carries out multi-snapshot space spectrum function smooth calculation, thus realizing more signal DOA estimation, and reducing influences on space spectrum estimation by the measuring errors.

Description

technical field [0001] The invention belongs to the technical field of radio signal positioning, and in particular relates to a multi-source wave direction-of-arrival estimation method. Background technique [0002] In recent years, with the development of digital signal processing technology, direction of arrival estimation has been widely used in radar, sonar, geological detection and radio astronomy and other fields. With the increasingly complex electromagnetic environment, the requirements for direction of arrival estimation become higher. However, some traditional direction of arrival estimation techniques are limited by the size of the antenna array, and cannot accurately estimate too many spatial sources. On the basis of the virtual array element based on the fourth-order cumulant, many scholars have searched for a method to realize the expansion of the array, which has increased the number of space source estimates to a certain extent. Among them, the MUSIC-LIKE alg...

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Problems solved by technology

[0003] Aiming at the problem that the number of sources estimated by the antenna array is limited in the traditional DOA algorithm, the present invention provides a method for estimating the direction of arrival of multi-sources. By constructing a fourth-order cumulant matrix, the dimension of the matrix is ​​reduced, and the amount of computation is reduced. Smooth calculation of spatial spectrum function in snapshots, realizing direction of arrival estimation for more signals, and effectively reducing the impact of measurement errors on spatial spectrum estimation

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