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Sound velocity correction method for edge beam sounding data based on vertical beam sounding

An edge beam and data technology, which is applied in the field of sound velocity correction of edge beam sounding data based on vertical beam sounding, can solve the problems of reduced beam coverage, reduced multi-beam survey efficiency, no measurement on the seabed, etc., and achieves accurate water depth and position data. Effect

Inactive Publication Date: 2011-12-07
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

Due to the deletion of a large number of edge beam data, the beam coverage width is reduced, and even some seabeds have no measurement data, which directly reduces the efficiency of multi-beam survey

Method used

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  • Sound velocity correction method for edge beam sounding data based on vertical beam sounding
  • Sound velocity correction method for edge beam sounding data based on vertical beam sounding
  • Sound velocity correction method for edge beam sounding data based on vertical beam sounding

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Embodiment Construction

[0014] 1 Basic Principles of Ray Tracing

[0015] Since seawater is a non-uniform medium, when the sound ray travels in it, it is known by Snell's law that its path is an irregular continuous curve. In order to obtain the water depth value of the measuring point accurately, the sound ray path must be tracked. The geometric diagram of the calculation principle of the measuring point position is as follows (attached figure 1 ) shown.

[0016] The vertical distance Z from the transducer of the multi-beam sonar system to the corresponding beam measuring point on the seabed, and the vertical distance X from the beam measuring point to the track line can be expressed in the form of equation (1).

[0017] Z=∑c i t i cosθ i

[0018] X=∑c i t i sinθ i (1)

[0019] In the formula, t i is the travel time of the beam at layer i, θ i is the beam pointing angle of layer i, c i is the speed of sound at the calculation point. Combined with Snell's law (see Equation 2), for a...

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Abstract

The invention relates to a method for correcting sound velocity of edge beam water depth data based on vertical beam water depth, and a multi-beam echo sounder system (Multi-beam Echo Sounder System, namely MBES) beam refraction correction technology method. Aiming at the actual situation that the edge beam water depth data of the current multi-beam survey system has large errors and a large number of edge beam data are deleted during data processing, the present invention proposes: perform initial processing on the original data of the multi-beam survey, take the vertical beam water depth data as a benchmark, and compare the same From the water depth data measured by the edge beams at the position, the beam travel time corresponding to each beam water depth data, the initial beam launch angle and the attitude data at this time are extracted, an equivalent sound velocity profile is inverted, and the sound ray tracking is performed on the edge beams, and the solution is calculated More accurate bathymetry and position data.

Description

technical field [0001] Multi-beam echo sounder system (Multi-beam Echo Sounder System, namely MBES) beam refraction correction technology method. Background technique [0002] The sound velocity profile is an important factor to ensure the measurement accuracy of the multi-beam sonar measurement system. The multi-beam sonar sounding system also relies on calculating the propagation time of sound waves in water to achieve bathymetry. However, compared with the single-beam sounding system, the multi-beam sonar sounding system is much more affected by the speed of sound than the former. The multi-beam sonar system emits a group of sound beams in a directional manner, and calculates the travel time of each beam to obtain the water depth value of multiple points. Among the multiple beams transmitted at the same time, except for the middle beam which is transmitted vertically to the horizontal plane, the other beams all have a certain angle with the horizontal plane. According t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S15/08
Inventor 丁继胜周兴华吴永亭刘焱雄唐秋华
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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