Temporal-spatial joint filtering high-resolution DOA (Direction of Arrival) estimation method based on compressed sensing technology

A azimuth estimation and compressed sensing technology, used in radio wave measurement systems, instruments, etc., can solve problems such as high input signal-to-noise ratio thresholds, and achieve good spectral resolution, strong robustness, and strong single snapshot robustness. Effect

Inactive Publication Date: 2013-11-20
HARBIN ENG UNIV
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Problems solved by technology

However, this method requires a higher input signal-to-noise ratio threshold, and also has certain requirements for the parameters of the signal probability distribution model.

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  • Temporal-spatial joint filtering high-resolution DOA (Direction of Arrival) estimation method based on compressed sensing technology
  • Temporal-spatial joint filtering high-resolution DOA (Direction of Arrival) estimation method based on compressed sensing technology
  • Temporal-spatial joint filtering high-resolution DOA (Direction of Arrival) estimation method based on compressed sensing technology

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[0025] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0026] The signal processing flow of high-resolution orientation estimation based on compressed sensing technology is as follows: figure 1 As shown, the main steps are:

[0027] (1) Parameter initialization, mainly including: the number of acoustic vector random array array elements, far-field equal power incoherent narrow-band dual-target incident angle, dual-target incident frequency, sampling frequency, input signal-to-noise ratio, and the number of airspace sampling snapshots.

[0028] Number of acoustic vector random array array elements: M=10;

[0029] Far-field equal-power incoherent narrow-band dual-target incident angle: θ 1 = 30°, θ 2 = 50°;

[0030] Double target incident frequency: f 1 = 1kHz, f 2 = 2kHz;

[0031] Sampling frequency: f s = 10kHz;

[0032] Input SNR: SNR=20dB;

[0033] Number of spatial sampling snapshots: α=200.

[0034] (2) Sou...

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Abstract

The invention provides a temporal-spatial joint filtering high-resolution DOA (Direction of Arrival) estimation method based on a compressed sensing technology. The method comprises the following steps: (1) acoustic pressure vibration velocity joint temporal filtering, to be specific, carrying out rotating combination on the data of an acoustic vector sensor, and utilizing differences in the corresponding properties of a signal and noise to carry out denoising processing; (2) matrix spatial filtering, to be specific, carrying out spatial filtering on the temporally filtered data by a matrix spatial filter of which the maximum value of the mean square error of attenuation in a stop-band and a passband is minimum; and (3) compressed sensing DOA estimation by the array of the acoustic vector sensor, to be specific, receiving data and a manually formed spatial over-complete redundance dictionary via an input array preprocessed by temporal filtering, and seeking the sparse representation of the signal to carry out vector spatial spectrum estimation. The method has great spectral resolution capability in the high-resolution DOA estimation problem of a high-speed motion target under single snapshot conditions and is insensitive to the wideband and narrowband properties and coherent properties of the signal.

Description

technical field [0001] The invention relates to an underwater acoustic vector signal processing method, in particular to a space-time combined filtering robust high-resolution orientation estimation method. Background technique [0002] Most underwater acoustic signal processing adopts the form of array to process the underwater acoustic information to obtain controllable array directivity and high spatial processing gain. Spatial spectrum estimation is one of the most important research directions of underwater acoustic array signal processing. It aims to study the ability of the processing system composed of spatial multi-sensor arrays to accurately estimate the parameters of the spatial signal of interest. It is mainly used to estimate the spatial domain of the signal. Parameter or source position. [0003] In recent years, with the rapid development of acoustic vector sensor technology in its theoretical analysis, performance evaluation and engineering practice, the ori...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52
Inventor 梁国龙马巍王逸林范展付进李晴
Owner HARBIN ENG UNIV
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