Uniform circular array single snapshot direction finding method based on pseudo covariance matrix

Abstract

The invention belongs to the technical field of electronic countermeasure, and particularly relates to a uniform circular array single snapshot direction finding method based on a pseudo covariance matrix. According to the invention, the method comprises: for array receiving data of a uniform circular array, converting the data into receiving data of a virtual linear array through mode space conversion, so that the array flow pattern has a Vandemode form; then constructing a pseudo covariance matrix, so that the pseudo covariance matrix used for subsequent processing can reach a full rank, andtherefore, subsequent feature decomposition can correctly segment a signal subspace and a noise subspace; and finally, using a MUSIC algorithm for the pseudo covariance matrix, that is, performing feature decomposition on the covariance matrix, and then performing searching according to the orthogonality of the steering vector and the noise subspace so as to obtain the azimuth angle of signal incidence. The method has the beneficial effects that single snapshot direction finding can be performed by using the uniform circular array, the method is simple, and the effect is good.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures, and relates to a uniform circular array single-snapshot direction finding method based on a pseudo-covariance matrix. Background technique [0002] Angle of Arrival (DOA) estimation is one of the main problems to be studied in array signal processing. DOA estimation has a wide range of applications in radio communication, electronic reconnaissance and other fields. Single-snapshot DOA estimation only processes the data of a single snapshot to realize the direction-of-arrival estimation of the input signal. At present, with the continuous improvement of real-time requirements for DOA estimation, reducing the number of sampling snapshots to reduce the amount of algorithm calculation and improve the real-time performance of the system has become a research hotspot in the field of DOA estimation in recent years. [0003] Among the single-shot direction finding algorithms, the most...

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Problems solved by technology

However, both of these methods can only handle matrices with vandemonde form, and cannot directly perform single-shot direction finding when using a uniform circular array

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