Multi-parameter joint estimation method of quaternion for double L-shaped tensile orthogonal couple array

Abstract

A multi-parameter joint estimation method for a double L-shaped electromagnetic vector sensor array is disclosed. The method comprises: receiving, by an array, K absolutely polarized unit power electromagnetic wave incident signals, and performing twice sampling on data received by an electromagnetic vector sensor; superposing the two groups of sampled data respectively according to X-coordinate direction electric dipoles and Y-coordinate direction electric dipoles in the same array element to form receive quaternion data of the entire array; calculating an autocorrelation matrix of the receive quaternion data of the entire array, and performing quaternion characteristic analysis to obtain an estimated value of an array guide vector, an array guide vector estimated value upon delaying, and an estimated value of a whole data array guide vector; by using the shift invariant relationship, obtaining directional cosine estimated values of the Kth incident signal in the X-coordinate and the Y-coordinate, and obtaining an estimated value of a two-dimensional arrival angle; and by using the rotation invariant relationship between array guide vectors of the sub-matrix, obtaining an estimated value of an auxiliary polarization angle and an estimated value of an polarization phase difference. The method according to the present invention is capable of protecting the vector features of the quaternion, and has an even smaller coupling error.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a parameter estimation method of a space-stretched electromagnetic vector sensor array. Background technique [0002] Electromagnetic vector sensor array is a new type of array that can obtain electromagnetic signal space and polarization domain information. With the rapid development of wireless communication services, scholars have achieved many valuable research results in parameter estimation based on electromagnetic vector sensor arrays, and proposed orthogonal electric dipole pairs, orthogonal tripoles, and orthogonal three magnetic Various types of electromagnetic vector sensor array parameter estimation algorithms such as loop and full electromagnetic vector sensor. [0003] figure 1 It is a schematic diagram of an L-shaped electromagnetic vector sensor array in the prior art. The array elements in the array are orthogonal electric dipole pairs, wh...

AI Technical Summary

Problems solved by technology

In theory, the co-point orthogonal electric dipole antenna has good performance, but in fact, due to the limitation of mechanical technology, it is difficult to realize the complete co-point of the electric dipole antenna, and the distance between the co-point antennas is too close, so There will be electromagnetic coupling phenomenon, resulting in coupling error

When there is a coupling error in the array, there is a deviation between the actual array manifold and the ideal array manifold, and the parameter estimation performance will degrade or even fail completely

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