Seabed backscattering intensity measurement method
A technology of backscattering and intensity measurement, applied in measuring devices, radio wave measuring systems, using re-radiation, etc., can solve time-consuming and labor-intensive problems, and achieve the effects of simple calculation, fast and accurate acquisition, and easy implementation
Active Publication Date: 2018-08-14
NAT DEEP SEA CENT
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[0004] The measurement of seafloor scattering intensity usually adopts a directional transmitting and receiving system, which not only requires precise calibration of the directivity of the transmitting and receiving system, but also requires mechanical or electronic rotation to obtain the seafloor scattering intensity at different grazing angles. To adjust the grazing angle, time-consuming and labor-intensive
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[0035] The method for measuring the backscattering intensity of the seabed based on non-directional sound sources and hydrophones proposed by the present invention, the specific implementation process is mainly divided into the following five steps: (1) make the measuring ship in a floating state, and record the number of pulses emitted under multiple times. (2) Calculate the statistical average of the mean square value of the hydrophone output voltage after removing the coherent interference; (3) Calculate the effective irradiation area area according to the emission pulse length; (4) According to The statistical average of the mean square value of the hydrophone output voltage, the sound source level, the sensitivity, the effective irradiation area and the propagation loss, and calculate the best estimated value of the backscattering intensity of the seabed through the sonar equation; (5) Calculate the backscattering intensity of the seabed measurement uncertainty.
[0036] ...
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The invention provides a seabed backscattering intensity measurement method, and belongs to the technical field of underwater sound. The method includes the steps of firstly, according to multiple sets of hydrophone receiving signals, calculating the statistical average of a mean square value of hydrophone output voltage for measuring the value of the average scattering sound intensity of the seabed; by calibrating a sound source and a hydrophone, obtaining the level of the sound source and the sensitivity; according to the length of a transmission pulse, calculating the area of an effective irradiation zone; finally, according to the statistical average of the mean square value of the hydrophone output voltage, the level of the sound source, the sensitivity, the area of the effective irradiation zone and transmission loss, calculating the best estimate value and measurement uncertainty of the seabed backscattering intensity through a sonar equation. The method is simple in calculativeprocess and easy to carry out, the seabed backscattering intensity within a wide glancing angle range can be obtained at the same time, and by means of the method, the seabed sound scattering properties can be obtained fast and accurately.
Description
technical field [0001] The invention belongs to the technical field of underwater acoustics, and is an easy-to-implement method for quickly and accurately obtaining submarine acoustic scattering characteristics, specifically a method for measuring submarine backscattering intensity based on non-directional sound sources and hydrophones. Background technique [0002] The acoustic scattering characteristics of the seabed usually refer to the change law of the scattering intensity of the seabed with the frequency of the sound wave, the grazing angle and the azimuth angle after the sound wave interacts with the seabed. When the sound wave irradiates from the water body to the seabed, the main mechanisms that may cause sound scattering are: rough seabed surface, inhomogeneity inside the sediment, rough interface of shallow strata (such as shallow bedrock), air bubbles and shell fragments, etc. Among the many scattering mechanisms, seafloor surface rough scattering and sediment vo...
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IPC IPC(8): G01S15/88
CPCG01S15/88
Inventor 于盛齐刘保华于凯本
Owner NAT DEEP SEA CENT