Satellite-borne laser data high-precision positioning method considering atmospheric delay correction
A technology of atmospheric delay and positioning method, applied in the field of remote sensing image processing, can solve problems such as laser positioning coordinate offset, and achieve the effect of improving the accuracy of the result and eliminating the influence
Inactive Publication Date: 2020-04-17
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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[0004] The technical solution of the present invention is to overcome the deficiencies of the prior art, and propose a high-precision positioning method for spaceborne laser data that takes into account atmospheric delay correction, which solves the problem of deviation of laser positioning coordinates caused by the influence of atmospheric delay on spaceborne laser altimetry data. shifting problem
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[0023] The present invention proposes a high-precision positioning method for spaceborne laser data that takes atmospheric delay correction into account: first, obtain the geodetic coordinates and measurement time of the laser footpoint, and convert the altitude of the laser footpoint coordinates into a potential height; Find two adjacent standard atmospheric pressure layers at the geopotential height, and obtain the meteorological data near the laser foot point by interpolation; then calculate the surface atmospheric pressure near the laser foot point; after obtaining the surface atmospheric pressure near the laser foot point, according to the dry The formulas of term delay and wet term delay calculate the dry term and wet term components of zenith delay; finally, the two zenith delay components are multiplied by the mapping function to obtain atmospheric delay correction, so as to ensure the positioning accuracy of spaceborne laser altimetry data.
[0024] The high-precision ...
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The invention discloses a satellite-borne laser data high-precision positioning method considering atmospheric delay correction, and aims at accurate laser pin location due to atmospheric refraction in satellite-borne height measurement data location, and the method comprises the steps: firstly obtaining the geodetic coordinates and measuring time of a laser foot point, and converting the altitudeof the coordinates of the laser foot point into a potential height; obtaining meteorological data near the laser foot point through interpolation; calculating the surface atmospheric pressure near the laser foot point; calculating dry term and wet term components of zenith delay according to dry term delay and wet term delay formulas; and finally, multiplying the two zenith delay components by amapping function to obtain atmospheric delay correction, thereby ensuring the accuracy of satellite-borne laser height measuring data positioning.
Description
technical field [0001] The invention relates to a high-precision positioning method for spaceborne laser data in consideration of atmospheric delay correction, and belongs to the technical field of remote sensing image processing. Background technique [0002] With the advancement of space-borne earth observation technology, surveying and mapping has been developed in the direction of modernization and intelligence. The traditional operation method of collecting basic surveying and mapping data through field surveys is gradually replaced by aerospace photogrammetry. Satellite photogrammetry has the advantages of being able to quickly obtain large-scale data and is not restricted by regions and countries. All countries are scrambling to develop their own surveying and mapping satellites. At present, my country's surveying and mapping satellites mainly include Ziyuan No. 3 and Tianhui satellites. Rank among the top in the world. Different from the Gaofen series satellites, sur...
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Login to View More IPC IPC(8): G01S17/88G01S17/06
CPCG01S17/06G01S17/88
Inventor 龙小祥李庆鹏徐大琦韩启金邵俊
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL