Active localization method based on time delay of arrival and angle of arrival of target echo under reliable acoustic path

A technology of target echo and positioning method, which is applied in the re-radiation of sound waves, radio wave measurement systems, instruments, etc., and can solve the problems of decreased detection performance and weak received signal level.

Active Publication Date: 2020-04-03
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

However, when the radiated noise level of the target is low, the method of passive detection using RAP faces the problem of weak received signal level, resulting in a decrease in detection performance

Method used

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  • Active localization method based on time delay of arrival and angle of arrival of target echo under reliable acoustic path
  • Active localization method based on time delay of arrival and angle of arrival of target echo under reliable acoustic path
  • Active localization method based on time delay of arrival and angle of arrival of target echo under reliable acoustic path

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Embodiment Construction

[0042] Main content of the present invention has:

[0043] 1) Place the monostatic active sonar below the critical depth of the deep sea. The active sonar consists of a single transmitting transducer and a multi-element receiving array (the number of hydrophones is between 6 and 64, including 6 and 64). The transmitting transducer emits a chirp signal (the emission may or may not have a certain vertical directivity), and irradiates the target scene from below through a reliable acoustic path. The target echo also returns through the reliable acoustic path and reaches the multi-element receiving array.

[0044] 2) Process the target echo collected on the multi-element array. The multi-element receiving array receives echoes, and uses matched filtering technology to extract the arrival delay of echoes (hereinafter referred to as direct waves) from each receiving hydrophone through the path of the transmitting transducer-target-multi-element receiving array. Calculate the arith...

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Abstract

The invention relates to an active target echo arrival time delay and arrival angle positioning method based on a reliable sound path. According to the method, a single emission energy transducer and one multi-element reception array which form a single base sonar arranged below the critical depth are employed, and the single emission energy transducer emits pulse signals and irradiates a target; a target echo of the target is acquired by the reception array, echo arrival time delay and an arrival angle of the emission energy transducer-target-reception array path are determined, through offline calculation, the nonstop wave arrival time delay and the nonstop wave arrival angle are acquired and are matched with actually-acquired nonstop wave arrival time delay and an actually-acquired nonstop wave arrival angle to acquire the target positioning result.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing. Background technique [0002] Deep-sea reliable acoustic path (RAP: reliable acoustic path) is one of the channels for deep-sea sound propagation. The condition for RAP to appear is that the receiver is located in the deep sea, and the sound velocity here is greater than the maximum sound velocity near the sea surface, that is, the receiver is located below the critical depth. The so-called reliable acoustic path means that when the sound source depth is greater than the critical depth, the sound propagation path is not affected by the near-sea surface effect or seabed interaction, so it has little relationship with the characteristics of the ocean environment near the sea surface, and the propagation signal is stable and reliable. [0003] RAP provides a high signal-to-noise ratio environment for sound source localization. There are two main reasons: (1) RAP is a direct pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/10G01S7/527G01S7/539
CPCG01S7/5273G01S7/539G01S15/102
Inventor 刘雄厚刘国鹏孙超蒋光禹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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