Improved two-dimensional co-prime array DOA estimation method

Abstract

The invention discloses a two-dimensional DOA estimation method based on an L-shaped improved co-prime array. High-performance DOA estimation is realized by utilizing the structural advantages of theco-prime array. The array element spacing of the L-shaped uniform array is limited by half wavelength; array element distance is very small, serious mutual coupling effects exist among the array elements; the aperture of the array is relatively small, so that the angle resolution is restricted; according to the improved DOA estimation method for the compressed translation co-prime array, covariance matrixes of data received by x-axis and z-axis sub-arrays are calculated firstly, vectorization and redundancy removal processing are conducted on the covariance matrixes, a Toeplize matrix is constructed by means of the processed data, and finally estimated values of a pitch angle and an azimuth angle are obtained. According to the improved compression translation co-prime L-shaped array provided by the invention, a uniform and complete full-distributed array with continuous virtual array element positions can be obtained by carrying out self-difference and mutual-difference operation on array element receiving data, and compared with an existing array, the array has a larger array aperture, a larger array freedom degree, a higher angle resolution and a higher application value.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, in particular to a novel two-dimensional coprime array DOA estimation method. Background technique [0002] One-dimensional DOA estimation assumes that the signal is incident from a certain plane. This assumption limits the application range of the one-dimensional DOA estimation algorithm. Two-dimensional DOA can break the above constraints and accurately describe the incident signal from any direction in the three-dimensional space. , so it is of great significance to study two-dimensional DOA estimation. Antenna array structures commonly used for two-dimensional DOA estimation include L-shaped uniform arrays, uniform planar arrays, and parallel arrays. At present, the 2D angle-of-arrival estimation algorithm based on the uniform array has gradually matured, but the uniform array has certain limitations and deficiencies. Compared with the uniform array, the non-uniform array st...

AI Technical Summary

Problems solved by technology

The array element spacing of the L-shaped uniform array is limited by the half-wavelength. The array element spacing of the uniform array used for DOA estimation of high-frequency signals is very small, and there is a serious mutual coupling effect, and the array aperture is small, which restricts the angular resolution. Therefore, Non-uniform two-dimensional arrays with sparse array elements have received more and more attention

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