Mutual coupling uniform linear array DOA estimation method

Abstract

The invention discloses a mutual coupling uniform linear array DOA estimation method, and relates to the technical field of ultrasonic arrays, and the method comprises the following steps: pre-determining an ultrasonic array structure, and carrying out the matrix reconstruction and self-correction based on a mutual coupling error matrix; carrying out a correction algorithm for proposing a uniform linear array; aiming at the limitation of an existing mutual coupling correction algorithm under an unknown mutual coupling condition, a block sparse weighting algorithm of an L1 norm optimization constraint model is adopted, the algorithm can effectively solve the DOA estimation problem of the uniform linear array under the unknown mutual coupling condition, accurate positioning of the uniform ultrasonic array is achieved, and the DOA estimation accuracy of the uniform linear array is improved. On the basis of the accuracy of the self-correction algorithm, the accurate echo direction can be effectively estimated by the ultrasonic array signal processed by the mutual coupling error self-correction algorithm and the joint approximate diagonalization algorithm.

Description

technical field [0001] The invention relates to the technical field of ultrasonic arrays, in particular to a method for estimating mutual coupling uniform linear array DOA. Background technique [0002] As the requirements for signal detection and parameter estimation in the space domain are getting higher and higher, array signal processing as the main means of space domain processing has been rapidly developed and applied. Spatial spectrum estimation technology, as an important research field of array signal processing, has achieved Great progress has been made, and high-resolution spatial spectrum estimation and direction-finding technology have also been developed. It has the advantages of high precision, high resolution, and simultaneous measurement of multiple signals. It has broad application prospects in the military field. However, the The algorithm needs to know the flow of the array accurately, if there is an error in the flow pattern of the array, the accuracy of...

AI Technical Summary

Problems solved by technology

[0002]With the increasing requirements for spatial domain signal detection and parameter estimation, array signal processing has been rapidly developed and applied as the main means of spatial domain processing. As an important research field of array signal processing, spatial spectrum estimation technology has made great progress. High-resolution spatial spectrum estimation and direction finding technology have also been developed. It has high precision, high resolution, and can measure multiple signals at the same time. and other advantages, it has a wide application prospect in the military field, but the algorithm needs to know the flow of the array accurately, if there is an error in the flow pattern of the array, it will cause the accuracy of the array to drop rapidly; compared with the traditional method, the accuracy of these algorithms The performance is completely behind, the bottleneck of the practical application of spatial super-resolution spectral estimation techniques may lead to the exhaustion of these algorithms, and array error correction is an important issue for this system

[0003] The mutual coupling effect of the antenna array is one of the inherent important characteristics of the array antenna. It not only has a certain impact on the electrical parameters such as the gain and beam width of the antenna array, but also changes the amplitude and phase of the antenna array signal, thereby seriously affecting the antenna array. Signal processing capability, therefore, antenna mutual coupling is an important factor that must be considered, and a mutual coupling uniform linear array DOA estimation method is urgently needed

Images