Inversion Method of Sound Velocity Profile Based on Inverted Multi-beam Echometer
A sound velocity profile and multi-beam technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, re-radiation of sound waves, instruments, etc., can solve the problems of limited application of inverted echometers and large measurement errors of inverted echometers, and achieve high Accuracy of marine environment estimation, effect of satisfying safety
Active Publication Date: 2021-04-20
ZHEJIANG UNIV
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Problems solved by technology
In the case of deep sea, the measurement error of the single-beam inverted echometer is relatively large
At the same time, considering the complex thermocline structure and space-time changing environment in shallow seas, the application of the single-beam inverted echometer is limited.
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[0044] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:
[0045] like figure 1 As shown, the multibeam echometer consists of:
[0046] Transmitting circuit: used to generate transmitted electrical signals.
[0047] Transmitting transducer array: used to convert the generated transmitted electrical signal into acoustic signal transmission.
[0048] Receiving transducer array: used to receive echoes reflected and scattered by water bodies and water surfaces, and convert echo acoustic signals into electrical signals.
[0049] Receiving circuit: used for amplifying, filtering and other preprocessing of the electrical signal converted by the receiving transducer array.
[0050] Attitude sensor: used to realize the attitude determination of the multi-beam echometer.
[0051] Pressure sensor: used to realize the pressure measurement of the multi-beam echometer.
[0052] Surface sound velocity head: used to r...
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The invention discloses a sound velocity profile inversion method based on an inverted multi-beam echometer. The method comprises the following steps: installing the multi-beam echometer upside down on an underwater submerged mark or fixing it on the bottom of the water, and transmitting a transducer array Transmit beams to the water surface and receive echo signals through the receiving transducer array; the multi-beam echo meter obtains the arrival angle and arrival time of echoes according to the received echo signals; solves EOF according to the prior information of the sound velocity profile, and obtains the sound velocity profile Dimensionality reduction base function description method; combined with EOF, acoustic ray tracking algorithm, surface sound velocity and multi-beam data, an optimization model is established; according to the established optimization model, the arrival time and angle of arrival of the received echo, and the surface sound velocity, the optimization algorithm is used to obtain Estimation of the sound velocity profile of the survey area. Further, the estimated value of the sound velocity profile is used to calculate the water temperature profile in the measurement area. The invention can quickly and accurately track the fluctuations of the sound velocity profile and the temperature profile.
Description
technical field [0001] The invention relates to the technical field of underwater acoustic measurement and signal information processing, in particular to a sound velocity profile inversion method based on an inverted multi-beam echometer. Background technique [0002] A typical ocean system is a complex system composed of many mechanisms and interacting physical, acoustic, optical, biological, chemical and geological processes, and there are various dynamic processes inside it. These dynamical processes and their coupling, together with interactions with the seabed, lead to inhomogeneities in the ocean interior and significant variations in time and space. Among many environmental parameters, the sound velocity profile has obvious time-varying characteristics, which has an important impact on the propagation of acoustic signals, and then affects the performance of sonar systems such as underwater acoustic communication, positioning, and surveying and mapping. The effective...
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IPC IPC(8): G01S15/88G01H5/00
CPCG01S15/88G01H5/00G01S15/89
Inventor 金丽玲徐文
Owner ZHEJIANG UNIV