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Airborne laser sounding data refraction error correction method for sea surface fluctuation

A refraction error, airborne laser technology, used in the re-radiation of electromagnetic waves, radio wave measurement systems, measurement devices, etc.

Pending Publication Date: 2021-06-04
THE FIRST INST OF OCEANOGRAPHY SOA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no patent for correcting the deviation of seabed point coordinate displacement caused by sea surface fluctuations

Method used

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  • Airborne laser sounding data refraction error correction method for sea surface fluctuation
  • Airborne laser sounding data refraction error correction method for sea surface fluctuation
  • Airborne laser sounding data refraction error correction method for sea surface fluctuation

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Embodiment Construction

[0045] The present invention studies the influence of sea surface fluctuations on the refraction of laser pulse propagation paths in airborne laser sounding, thereby affecting the coordinate value accuracy of seabed laser points, and then proposes a method for correcting the refraction error of airborne laser sounding data for sea surface fluctuations . In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below through specific embodiments.

[0046] The present invention models the propagation path of the laser pulse based on the fluctuation of the adjacent sea surface at the instant when the laser pulse enters the water, and the specific method is as follows:

[0047] S1 first uses the reflected laser point data on the sea surface, and uses the neighborhood adaptive selection method based on dimensional features to obtain the optimal sea surface normal vector. The calculation princip...

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Abstract

An airborne laser sounding data refraction error correction method for sea surface fluctuation is characterized by comprising the following steps: S1, neighborhood adaptive sea surface normal vector calculation based on dimension features; and S2, a laser pulse refraction error correction model based on sea surface fluctuation. According to the airborne laser sounding data refraction error correction method for sea surface fluctuation provided by the invention, sea surface fluctuation refraction error correction is carried out for each beam of laser pulse with seabed reflection, and the precision of airborne laser sounding data is effectively improved.

Description

【Technical field】 [0001] The invention relates to a refraction error correction method, in particular to a refraction error correction method for airborne laser sounding data aimed at sea surface fluctuations. 【Background technique】 [0002] Airborne LiDAR bathymetry (ALB) technology uses an aerial platform as a carrier, carrying laser scanners and positioning equipment for bathymetry to effectively obtain seabed topographic data in the scanning area, which has the advantages of fast, efficient, and stable. According to the propagation characteristics of light in seawater, there is a transmission window with relatively small energy attenuation in the blue-green light band of 0.47-0.58 μm, which provides conditions for the use of laser detection technology for water depth measurement. [0003] In the process of airborne laser bathymetry data acquisition, the propagation conditions and paths of the laser pulse emitted by the ALB system are more complex than those of land laser...

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Application Information

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IPC IPC(8): G01S7/497G01S17/08G01S17/88
CPCG01S7/497G01S17/08G01S17/88Y02A90/10
Inventor 徐文学郭锴刘焱雄田梓文唐秋华董志鹏李杰郭振
Owner THE FIRST INST OF OCEANOGRAPHY SOA