Acoustic measuring method of thickness of ice layer

Abstract

The invention provides an acoustic measuring method of the thickness of an ice layer. An ice detector vertically upwardly emitting high-frequency, broadband and narrow wave beam signals, and the thickness of the ice layer is measured by use of reflection echo signals irradiated on the upper surface and the lower layer of the ice layer by sound waves. Further brought forward is a sound ray correction technology, for solving the problem of precision reduction of the ice detector when the upper surface and the lower surface of the ice layer are fluctuated. According to the sound ray correction technology, an incident angle of sound waves is estimated by use of uniform-speed movement of an ice detector carrying platform (such as an underwater AUV and the like), a refraction angle formed when the sound waves are spread in the ice layer is solved according to an snell refraction low, and the spreading locus of the sound waves in the ice layer is corrected accordingly, so that the measuring precision of the thickness of the ice layer is improved.

Description

technical field [0001] The invention relates to a method for measuring the thickness of an ice layer, which belongs to an underwater acoustic detection method. Specifically, a method for measuring ice thickness using active sonar. Background technique [0002] In recent years, with the intensification of global warming, the Arctic ice has melted, the thickness of sea ice in the Arctic Ocean has become thinner year by year, and the ice-free period of the channel has been extended. The rich natural resources and waterway advantages in the Arctic region have attracted the attention of many countries. my country has also conducted six Arctic scientific expeditions and established Arctic scientific research stations. Related activities in the Arctic region require sea ice monitoring as a guarantee. Furthermore, the Yellow Sea and the Bohai Sea region of my country often experience a certain degree of sea ice danger in winter. The increase of sea ice on the sea surface has brough...

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Problems solved by technology

[0003] The article "Research and Application of Measuring Method of Sea Ice Thickness in Bohai Sea" has a detailed description of the above methods: the direct punching sampling method is effective for thinner ice layers, but it is limited by environmental conditions and time and space constraints. , the implementation and operation of this method are relatively difficult, and it can only monitor the sea ice in a limited range, and cannot monitor the thickness of sea ice in a wide range, real-time and accurately; The attenuation in the medium is relatively large, and the measurement results for relatively thick ice layers are poor; the satellite remote sensing method is greatly affected by weather conditions, and accurate measurement results cannot be obtained in cloudy or cloudy weather; the vertical sonar measurement method cannot obtain the ice layer. profile, and the measurement accuracy is not as high as the method proposed in this patent

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