Bathymetric surveying method without tide observation based on quasigeoid refinement

A technology of geoid and measurement method, which is applied in the directions of measuring devices, surveying of open-air water sources, measuring the depth of open-air water sources, etc., can solve the problem of higher accuracy of water level, and achieve the goals of saving investment, wide application range, and improving accuracy and efficiency Effect

Inactive Publication Date: 2015-06-24
SOUTHEAST UNIV
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Problems solved by technology

Due to the long and narrow shape of the Yangtze River, it is difficult to effectively refine the quasi-geoid using traditional elevation fitti

Method used

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  • Bathymetric surveying method without tide observation based on quasigeoid refinement
  • Bathymetric surveying method without tide observation based on quasigeoid refinement
  • Bathymetric surveying method without tide observation based on quasigeoid refinement

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example

[0089] The following calculation example takes a water depth test as an example. The test location is on a typical river surface of the Yangtze River. The test instruments are Hi-Target V30 receiver (connected to JSCORS system) and HD-310 depth sounder. According to the non-tide bathymetry technology of the Changjiang section based on the refinement of the quasi-geoid proposed in this patent, the data is collected in the field, and then processed in-house.

[0090] The elevation of the mud surface relative to the reference ellipsoid is:

[0091] h 泥 =H 大地高 -L-H 吃水 -H 水深 (9)

[0092] The elevation of the mud surface relative to the theoretical depth datum is:

[0093] H=H 理 -H 泥 =H 理 -(H 大地高 -L-H 吃水 -H 水深 )

[0094] =(H 理 -H 大地高 )+L+H 吃水 +H 水深 (10)

[0095] If the theoretical depth datum in formula (10) is regarded as quasi-geoid, H 理 is the elevation difference between the quasi-geoid and the ellipsoid, that is, the elevation anomaly ζ, so f...

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Abstract

The invention discloses a bathymetric surveying method without tide observation based on quasigeoid refinement. The method comprises the steps of firstly carrying out height fitting for WGS-84 geodetic height measured by a network RTK by virtue of a sectional secondary curve surface and a BP neural network model so as to convert the measured geodetic height to 85 normal height, subtracting the height from a GPS antenna to the water from the obtained 85 normal height to obtain the normal elevation of the water surface, and obtaining the water bottom 85 elevation data according to the water surface normal elevation and the water depth data measured by a bathymetric surveying energy transducer without observing the water level data of a tidal station. By adopting the method, the water depth surveying precision and efficiency can be obviously improved, and the manpower and the material resource can be saved.

Description

technical field [0001] The invention relates to a geoid-like refinement non-tide water depth measurement method in a narrow and long area, belonging to the technical field of non-tide water depth measurement. Background technique [0002] The water depth measurement on the sea surface is affected by waves and tides. The original water depth data needs to be rectified and corrected by the transducer draft, sound velocity, swell, water level, etc. to obtain the water depth on the map relative to a fixed base surface (theoretical depth reference noodle). Regardless of single-beam or multi-beam bathymetric methods, the final accuracy of bathymetry is affected by factors such as the dynamic draft of the transducer, measured water depth, swell, and tide level when using the traditional tide gauge measurement method. [0003] First of all, when the survey ship is moving, it is difficult to accurately separate and measure the dynamic draft of the transducer due to the influence of ...

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Application Information

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IPC IPC(8): G01C13/00
CPCG01C13/008Y02A90/30
Inventor 生仁军高成发李术元李昱时小飞
Owner SOUTHEAST UNIV
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