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Electromagnetic vector sensor array angle estimation method based on double quaternions

A sensor array, angle estimation technology, applied in radio wave measurement systems, direction-determining directional devices, radio wave direction/bias determination systems, etc.

Pending Publication Date: 2021-04-06
AIR FORCE UNIV PLA
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Problems solved by technology

From the perspective of Maxwell's equations, XIAOFENG et al. derived a complete double quaternion time-domain signal model of the electromagnetic vector sensor, but it is difficult to transplant because it does not use the traditional polarization domain steering vector.

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  • Electromagnetic vector sensor array angle estimation method based on double quaternions
  • Electromagnetic vector sensor array angle estimation method based on double quaternions
  • Electromagnetic vector sensor array angle estimation method based on double quaternions

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[0126] In order to verify the feasibility of the present invention, carry out following experiment respectively:

[0127] Simulation experiment 1: In order to estimate the azimuth and elevation angles at the same time, the experiment uses an L-shaped polarization-sensitive array with 10 elements, that is, 5 three-orthogonal electric dipole array elements are placed on the x-axis and y-axis respectively. The element spacing is taken as half a wavelength. The time domain BQ-MUSIC algorithm proposed in this paper is compared with the LV-MUSIC algorithm. Assuming that there are two independent and incoherent sources in the space, they are incident on the array from the far field in different directions, and the incident angle is For the convenience of comparison, the same polarization parameters (γ, η)=(50°, 30°) are set for the two sources. In an incoherent noise environment with a signal-to-noise ratio of 5dB, set the number of snapshots to 512, figure 1 and figure 2 are t...

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Abstract

The invention discloses an electromagnetic vector sensor array angle estimation method based on double quaternions. The method comprises steps that the double quaternions are introduced on the basis of a quaternion model, and a time-domain tri-orthogonal electric dipole sensor array model is built; the orthogonal information between array element electric dipoles is effectively reserved, orthogonality between quaternions has higher constraint than vector orthogonality, and better angle measurement performance can be achieved. According to the method, arrival angle estimation is carried out through a double quaternion multi-signal classification method BQMUSIC, under the condition of polarization parameter priori, better angle measurement performance than that of LVMUSIC is achieved through the BQMUSIC, the operand is reduced, and meanwhile robustness of related noise is improved. In addition, the double quaternion method not only expands a component on the basis of a two-component sensor quaternion model, but also has the potential of solving other problems of the quaternion model.

Description

technical field [0001] The invention relates to the field of vector sensor signal processing, in particular to a double quaternion-based electromagnetic vector sensor array angle estimation method. Background technique [0002] A complete electromagnetic vector sensor consists of three electric dipoles and three magnetic rings, among which the electric dipoles and the magnetic rings are mutually orthogonal in space. The electromagnetic vector sensor array (also known as polarization-sensitive array) can not only obtain spatial information through the phase difference between array elements like a scalar array, but also obtain direction information contained in the polarization steering vector. The long vector (LV) method is a classic vector sensor signal processing method. This method arranges multiple output components of each sensor directly to form a column vector, which has the advantages of simple implementation and clear meaning. However, this arrangement method simpl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S3/46
CPCG01S3/143G01S3/46Y02D30/70
Inventor 宋玉伟胡国平郑桂妹主钦宇陈晨王鸿帧彭加强
Owner AIR FORCE UNIV PLA
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