DOA Estimation with Spatial Spread Vector-Sensor Array Based on Biquaternion MUSIC

Qinyu Zhu,Guimei Zheng,Chen Chen,Qian Guo,Abdul Basit

doi:10.1155/2021/9979881

Abstract

The mutual coupling among various components of the collocated crossdipole (CCD) vector-sensor is severe, and its application is greatly limited. The spatial spread dipole (SSD) vector-sensor can avoid this problem, but the multiple signal classification (MUSIC) algorithm for the SSD array is rarely developed. In view of this situation, this paper proposed a MUSIC-like algorithm for the SSD array. The biquaternion model was first established, and the biquaternion MUSIC (BQ-MUSIC) algorithm was developed on the basis of this model, for the two-dimensional direction-of-arrival (2D-DOA) estimation. Our proposed algorithm requires low computational complexity by adopting the dimensionality reduction method. Numerical simulations verify the effectiveness of the proposed algorithm.

Highlights

The electromagnetic vector-sensor (EMVS) array is known as polarization sensitive array due to their ability to sense the polarization information of electromagnetic waves
EMVS array has the following advantages: (1) they can sense electromagnetic waves in a vector mode and provide polarization information of electromagnetic sources; (2) collocated EMVS that appeared in the early stage is suitable for the direction of arrival estimation for near-field or far-field, broad-band, or narrow-band signals; (3) different polarization information can be exploited in polarization domain when polarization electromagnetic wave cannot be distinguished in the spatial domain
Simulation experiment: as shown in Figures 6 and 7, respectively, the spatial spectrum for collocated crossdipole (CCD)-EMVS array and spatial spread dipole (SSD)-EMVS array is obtained by BQ-multiple signal classification (MUSIC)

Summary

Introduction

The electromagnetic vector-sensor (EMVS) array is known as polarization sensitive array due to their ability to sense the polarization information of electromagnetic waves. The appropriate application of polarization diversity technology could bring great convenience to the subsequent target recognition and classification; (4) when the spatial aperture of the array is small, the EMVS array still have a better resolution It is suitable for limited physical space such as mobile platform [2]. According to the modified vector crossproduct method based on the ingenious array arrangement, Wong et al [18] have obtained a 2-D DOA estimation of the spatially spread vector-sensors. Gong et al have put forward a spatially spread quint of dipoles or loops that are symmetrical in space With this feature, an efficient DOA and polarization estimator is realized using the vector crossproduct method [20]. We use simulation experiments to verify the effectiveness of the proposed algorithm

Biquaternion Operation and EVD of Hermitian Matrix

Array Signal Model

Biquaternion-MUSIC for SSD Array

Computational Analysis

Simulation Results

Conclusion