A weighted underwater target detection method based on modal domain subspace detector
A detection method and modal space technology, applied in instruments, measuring devices, re-radiation of sound waves, etc., can solve the problems of MSD detection performance degradation, and achieve better detection performance, greater detection probability, and improved detection performance.
Active Publication Date: 2022-06-14
NORTHWESTERN POLYTECHNICAL UNIV
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But at the same time, compared with the MFD detector, the degree of freedom of the MSD has increased by M-1 times (here M is the number of modal subspaces), because the detection probability of the subspace class detector is inversely proportional to the degree of freedom (Kay S M. Fundamentals of statistical signal processing [M]. Prentice Hall PTR, 1993.), so the detection performance of MSD has a relatively large decline compared with MFD detectors, and the magnitude of this performance decline will increase with the increase of M increase and increase
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0018] Step 1: Preprocess the received signal data of the Vertical Linear Array (VLA) and calculate the relevant sound field parameters:
[0019] The VLA with the number of array elements and the array element spacing of d is placed in the water to receive hydroacoustic data. The VLA covers the entire water depth. The horizontal distance between the target and the receiving array VLA is more than 5 kilometers. The time-domain sampling data to be detected is subjected to narrow-band Fourier transform at the desired frequency f to obtain the frequency-domain received data r. According to the underwater acoustic environment parameters, the sound field software KRAKEN is used to calculate the modal space matrix Φ collected by each hydrophone of VLA and the modal attenuation coefficient δ of each order m , where the underwater acoustic environment parameter...
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The invention provides an underwater target detection method based on the weighting of a modal domain subspace detector, relates to the field of array signal processing, preprocesses the received signal data of a vertical line array and calculates relevant sound field parameters, and uses the modal matrix The orthogonality of each order MSSD is constructed, and the attenuation index of each order modal coefficient is calculated, and then the weighted coefficients of each order MSSD are obtained; and the final weighted reconfiguration modal space detector is constructed, and the detection threshold is obtained according to the false alarm probability. And compared with the detection threshold, it indicates that the target exists, otherwise the target does not exist. The present invention uses the reciprocal of the modal attenuation index to weight MSSDs of each order to weaken the impact of MSSDs with poor detection performance on the final detector, so that the detection performance of the reconstructed detector WMSD is improved, that is, in the same input signal-to-noise Under the conditions of ratio and false alarm probability, the reconstructed detector WMSD has a greater detection probability.
Description
technical field [0001] The invention relates to the field of array signal processing, in particular to an underwater target detection method. Background technique [0002] Passive detection of underwater targets is one of the main tasks of passive sonar systems. Most of the traditional passive sonar detection methods are driven by pure data (Zhang Xiaoyong, Luo Yuanyuan. Development of passive sonar signal detection technology [J]. Acoustics Technology, 2014(6):559-563.), assuming that the ocean channel is an ideal channel, using Matched filtering and beamforming techniques are used to improve the processing gain, which can be mainly divided into detection methods based on time domain information and detection methods based on spatial domain information. [0003] In recent years, with the development of vibration and noise reduction technology and the increasingly complex underwater acoustic environment of sonar, people gradually found that traditional passive sonar detecti...
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IPC IPC(8): G06F17/10
CPCG01S15/04
Inventor 孙超孔德智刘雄厚
Owner NORTHWESTERN POLYTECHNICAL UNIV