Uniform circular array differential phase based single distributed source DOA estimation method

Abstract

The invention relates to the technical field of array signal processing technology, especially relates to DOA (Direction Of Arrival) estimation of a wireless signal source, and particularly relates toa uniform circular array differential phase based single distributed source DOA estimation method. The method includes calculating a corresponding covariance matrix through output signals of different array elements of the uniform circular array; extracting exact upper triangular element phases of the covariance matrix and performing vectorization treatment, and obtaining a differential phase vector; obtaining single distributed source central azimuth angle estimation and central pitch angle estimation through least squares estimation. According to the invention, a two-dimensional DOA closed-form solution is obtained directly through the least squares method, spectrum peak search and eigenvalue decomposition calculation are avoided and complexity is reduced substantially.

Description

technical field [0001] The present invention relates to the technical field of array signal processing, in particular to DOA estimation for wireless signal sources, in particular to a single-distributed source DOA estimation method based on uniform circular array differential phase. Background technique [0002] In the application fields such as radar, sonar and mobile communication, the transmitted signal is often affected by scattering and reflection in complex environments, so that the signal energy received by the antenna array presents a certain distribution in a certain range of space. At this time, the performance of the traditional direction of arrival (DOA) estimation algorithm based on the assumption of the point source model will seriously deteriorate, and a parameterized distributed source model needs to be used for processing. According to whether different path components of the same source are correlated, distributed sources mainly include two types: coherentl...

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Problems solved by technology

Further, some scholars considered a uniform cylindrical array (UCyA for short) composed of multiple UCAs, and proposed a low-complexity two-dimensional DOA estimation method in beam space. The GMUSIC method is similar, but the calculation is performed in the beam domain, and the central azimuth angle estimation is obtained through the beam space GMUSIC (beamspace GMUSIC, abbreviated as BS-GMUSIC) method, which has low computational complexity

However, in the above method, the complex peak search and eigenvalue decomposition operations are still unavoidable, so the complexity still needs to be reduced

In addition, the SOS, GMUSIC and BS-GMUSIC methods all require multiple UCAs, and the hardware complexity of the array structure is high, which is not conducive to engineering practice

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