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Coherent signal two-dimensional DOA estimation method based on quaternion

A coherent signal, quaternion technology, applied in complex mathematical operations, design optimization/simulation, special data processing applications, etc., to achieve the effect of utilization, accurate DOA estimation results, and convenient processing methods

Active Publication Date: 2021-08-31
HARBIN ENG UNIV
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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art, the present invention proposes a brand-new idea of ​​modeling signals in the quaternion domain, aiming at solving "how to make full use of the array data while eliminating the additional additive noise introduced" this question

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  • Coherent signal two-dimensional DOA estimation method based on quaternion
  • Coherent signal two-dimensional DOA estimation method based on quaternion
  • Coherent signal two-dimensional DOA estimation method based on quaternion

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Embodiment Construction

[0079] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0080] combine Figure 1 to Figure 5 , the steps of the present invention are as follows:

[0081] Step 1: Establish a complex model of the observed signal:

[0082] Assuming that the array is a linear array of vector sensors arranged at half-wavelength equal intervals along the z-axis, and the single-vector sensor includes a sound pressure sensor and two particle velocity sensors pointing to the x-axis and y-axis respectively, then the vector sensor manifold vector can be written as:

[0083]

[0084] where θ k and φ k are the horizontal angle and elevation angle of the kth signal respectively, u k and v k are the direction cosines corresponding to the particle velocity sensors pointing to the x-axis and y-axis respectively. Assuming that K far-field narrow-band signals are incident on the sensor array, the receiving signal m...

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Abstract

The invention provides a quaternion-based coherent signal two-dimensional DOA (Direction of Arrival) estimation method. The method comprises the following steps: establishing an observation signal complex model; establishing an observation signal quaternion model; constructing a correlation matrix, performing quaternion cross-correlation vectorization simplification, and realizing signal source decoherence through correlation matrix smoothing; estimating a signal pitch angle by using a propagation operator method; and estimating a propagation operator, estimating a horizontal azimuth angle of an incident signal, and reconstructing an array response matrix. According to the method, the problem of how to eliminate the introduced additional additive noise while fully utilizing the array data is solved.

Description

technical field [0001] The invention relates to accurate estimation of the directions of arrival of multiple coherent signal sources by using a vector sensor array, in particular to a two-dimensional DOA estimation method for coherent signals based on quaternions, which belongs to the field of array signal processing. Background technique [0002] Compared with the traditional scalar sensor, the acoustic vector sensor can also provide the three-dimensional particle vibration velocity information at a certain point in the sound field while measuring the sound pressure, so as to achieve a more comprehensive and sufficient acquisition of the sound field information, so it has been used in recent years. It plays an important role in the field of underwater acoustic array signal processing. In traditional methods, the output signal of the vector hydrophone is often modeled in the complex number domain, and the components of the signal are spliced ​​into a "long vector" form. This...

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Application Information

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IPC IPC(8): G01S3/80G06F17/16G06F30/20
CPCG01S3/80G06F17/16G06F30/20
Inventor 娄毅曲星昊夏雪芹陆胤亨乔钢
Owner HARBIN ENG UNIV
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