Multi-beam water body data processing method based on flat seabed
A data processing and multi-beam technology, applied in the direction of sound wave re-radiation, radio wave measurement system, utilization of re-radiation, etc., can solve problems affecting the interpretation of water body data
Active Publication Date: 2018-12-07
OCEAN UNIV OF CHINA
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This interference greatly affects the interpretation of water body data
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[0031] The present invention will be described in detail below in combination with specific embodiments.
[0032] The present invention adopts such as figure 2 The processing method shown:
[0034] Taking the EM122 deep-water multi-beam system of the Norwegian Kongsberg company as an example, the specific implementation of this method is carried out. The operating frequency of the system is 12KHz, and it can form 288 beams. The system transmits beams with a maximum sector opening angle of 180° and a beam width of 1°×1°. The data storage format of the EM multi-beam system includes ALL format and WCD format. The ALL file contains data packages such as bathymetry, positioning, date, time, attitude sensor, compass, etc., while the water body data package is stored in the WCD file. According to the file format, write a program to parse the original data.
[0035] (2) Homing of water body sampling points
[0036] According to the original data, us...
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The invention discloses a multi-beam water body data processing method based on a flat seabed. The method comprises a step of analyzing original data according to a multi-beam model, a step of restoring water body sample points, carrying out sampling point restoring processing on each piece of Ping data such that an echo intensity value restores to a true geographical location, a step of averagingmultiple pieces of Ping water body data, carrying out averaging on the multiple pieces of Ping water body data according to a positional relationship of sampling points, calculating the average echointensity of each sampling point, and checking whether a value is reasonable or not, a step of calculating an uniform seawater echo intensity, separately calculating each piece of Ping data and selecting central beam water body data with less interference and no obvious feature target, a step of extracting seabed echo and filtering specular reflection interference and receiving sidelobe interference, and a step of outputting data, drawing an image map of a multi-beam water body and a cross section of the multi-beam water body along a heading direction, and comparing processing results. The method has the advantage that the data quality is greatly improved on the basis of retaining all the water body data.
Description
technical field [0001] The invention belongs to the technical field of marine surveying and mapping, and relates to a multi-beam water body data processing method based on a flat seabed. Background technique [0002] In recent years, multi-beam sonar technology has developed rapidly, and most multi-beam measurement systems have the ability to measure water depth data and record water body data at the same time. Multi-beam water body data carries the complete acoustic information of the beam from the transducer to the seabed, and can be used to detect objects or physical phenomena such as fish schools, large marine mammals, plankton, submarine cold seeps, and ocean internal waves. Deimling et al. used multi-beam water column data to study seabed gas leakage. Wyllie et al. compared multi-beam bathymetry and multi-beam water body data in the wreck sea area and found that water body data has better detection ability for details such as shipwreck masts. Multi-beam water informat...
Claims
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Login to View More IPC IPC(8): G01S15/88G01S15/96G01S7/527G01S7/536
CPCG01S7/527G01S7/536G01S15/88G01S15/96
Inventor 权永峥丁咚李广雪冯秀丽王祥东徐继正秦浩森
Owner OCEAN UNIV OF CHINA