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Active positioning method based on reliable sound path and target multipath echo

A positioning method and acoustic path technology, applied in the direction of sound wave re-radiation, radio wave measurement system, using re-radiation, etc., can solve the problems of weak received signal level and decreased detection performance

Active Publication Date: 2017-10-20
NORTHWESTERN POLYTECHNICAL UNIV
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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 positioning method based on reliable sound path and target multipath echo
  • Active positioning method based on reliable sound path and target multipath echo
  • Active positioning method based on reliable sound path and target multipath echo

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Embodiment Construction

[0043] The main contents of the present invention are:

[0044] (1) Place a monostatic active sonar at the critical depth of the deep sea, transmit pulse signals and use reliable acoustic paths to illuminate the target. The active sonar is composed of a single transmitting transducer and a single receiving hydrophone, and is located at the critical depth of the deep ocean. The transmitting transducer transmits pulse signals at a certain vertical opening angle. The pulse signal illuminates the target scene upward along a reliable acoustic path, and the acoustic signal emitted along the lower boundary of the open angle does not touch the seabed. The acoustic signal within the open angle can illuminate the target with a horizontal distance of 5-40 kilometers. The target echo reaches the receiving hydrophone along a reliable acoustic path, from which the multi-path echo of the target is collected and the multi-path time domain envelope and multi-path delay information are extracted....

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Abstract

The invention relates to an active positioning method based on a reliable sound path and target multipath echo. For solving disadvantages of a passive detection method based on a reliable sound path, a single base active sonar is proposed to arrange under the critical depth, the reliable sound path is utilized to irradiate a target, the target multipath echo is further acquired, and the final target positioning result is acquired. The method is advantaged in that the basic principle and an enforcement scheme are verified through computer value simulation, as proved by the result, effective target positioning in the deep sea environment can be realized.

Description

Technical field [0001] The invention belongs to the field of underwater acoustic signal processing. Background technique [0002] The deep-sea reliable acoustic path (RAP: reliable acoustic path) is one of the channels for deep-sea sound propagation. The condition of RAP is that the receiver is located in the deep sea, and the speed of sound here is greater than the maximum value of the speed of sound near the sea surface, that is, the receiver is located below the critical depth. The so-called reliable sound 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 a small relationship with the characteristics of the marine environment near the sea surface, and the transmitted 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 path ...

Claims

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Application Information

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IPC IPC(8): G01S15/06G01S15/32G01S15/88G01S7/527
CPCG01S7/527G01S15/06G01S15/32G01S15/88
Inventor 刘雄厚刘国鹏孙超蒋光禹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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