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Improved Wiener Filter and Target Orientation Estimation Method Based on the Filter

A technology of Wiener filter and hydrophone array, which can be used in direction finders using ultrasonic/sonic/infrasonic waves, systems that eliminate unnecessary waves, systems that determine direction or offset, etc., and can solve the problem of orientation estimation performance degradation , The noise suppression ability and other issues are not fully explored to achieve the effect of reducing the threshold of the signal-to-noise ratio, overcoming the decline in estimation performance, and the reduction of the threshold of the signal-to-noise ratio

Active Publication Date: 2022-07-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The above-mentioned various improved methods based on the DAS beamforming method all deal with the covariance matrix, and do not fully exploit the noise suppression ability
Under low signal-to-noise ratio, the performance of orientation estimation based on these methods degrades

Method used

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  • Improved Wiener Filter and Target Orientation Estimation Method Based on the Filter

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specific Embodiment

[0057] The invention combines the ability of the beamformer to suppress noise in the space domain and the improved ability of the Wiener filter to suppress the noise in the time domain, and estimates the target orientation while suppressing the noise. In order to obtain the azimuth estimation of the target, the Wiener filter is improved first, and then the beamformer is used, which is called the BATF method, such as figure 1 shown. According to different conditions, the BATF method controls the parameters of the improved Wiener filter to control the degree of signal distortion, so that the output signal of the improved Wiener filter is within the range of the beamformer's tolerance to signal distortion, so as to obtain the best output. , and reduces the signal-to-noise ratio threshold of the target bearing estimation and the root mean square error.

[0058] Simulation conditions: In a spatially uniform noise field, consider a uniform line array with 20 array elements and an a...

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Abstract

The invention relates to an improved Wiener filter and a method for estimating target azimuth based on the filter. Combined with the ability of a beamformer to suppress noise in the space domain and the improved ability of the Wiener filter to suppress noise in the time domain, it proposes that the received data First, by improving the Wiener filter, a certain gain is obtained in the time domain, and then the target azimuth estimation is obtained through the beamformer. This method is called beamforming after tradeoff filter (BATF). By controlling the parameters of the improved Wiener filter, the signal distortion and noise suppression are effectively controlled, so that the output signal of the improved Wiener filter is within the range of the beamformer's tolerance to signal distortion, thereby obtaining the best output, and making The root mean square error of target bearing estimation is reduced, the signal-to-noise ratio threshold of target bearing estimation is lowered, and the problem that the performance of target bearing estimation is degraded under low signal-to-noise ratio of existing methods is overcome.

Description

technical field [0001] The present invention relates to the field of underwater acoustic array signal processing and target azimuth estimation, and relates to an improved Wiener filter and a method for estimating target azimuth based on the filter. Background technique [0002] Target orientation estimation is the main task in underwater acoustic signal processing. Due to the complex underwater acoustic environment and the low signal-to-noise ratio of target signals, in underwater acoustic signal processing, it is generally necessary to suppress noise and improve processing gain by means of array signal processing. . Typically, target azimuths are estimated using subspace decomposition methods and beamforming methods. The biggest disadvantage of the algorithm based on the subspace decomposition method is that under low signal-to-noise ratio, the number of signal sources is estimated incorrectly, and its performance may be seriously degraded. Beamforming methods include Del...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/805G01S3/86
CPCG01S3/805G01S3/86
Inventor 杨益新夏麾军马远良韩一娜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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