Satellite-based laser on-orbit orientation calibration method based on pyramidal searching terrain matching

A technology of laser pointing and terrain matching, which is applied in the direction of measuring devices and instruments, can solve the problems of difficult implementation and low success rate of airborne infrared camera imaging method

Active Publication Date: 2017-06-20
自然资源部国土卫星遥感应用中心
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Problems solved by technology

Each method has its own advantages and disadvantages. Since domestic high-resolution remote sensing satellites generally use a large platform and a three-axis attitude stabilization system, they only hav

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  • Satellite-based laser on-orbit orientation calibration method based on pyramidal searching terrain matching
  • Satellite-based laser on-orbit orientation calibration method based on pyramidal searching terrain matching
  • Satellite-based laser on-orbit orientation calibration method based on pyramidal searching terrain matching

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Embodiment Construction

[0047] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0048] The spaceborne laser on-orbit pointing calibration method based on pyramid search terrain matching proposed by the present invention specifically includes the following steps:

[0049] Step 1, extract laser data and terrain data;

[0050] According to a preferred embodiment of the present invention, the present invention extracts the laser data of the No. 3 02 star laser altimeter track 1081 as test data, and the laser data includes the laser emission time t and the transit time Δt of the laser from emission to reception , the distance from the satellite to the earth surface can be obtained through the transit time Δt, and the obtained laser data can be substituted into the laser rigorous geometric model to obtain the coordinates of the laser arrival point on the ground (including plane and ...

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Abstract

The invention discloses a satellite-based laser on-orbit orientation calibration method based on pyramidal searching terrain matching. The satellite-based laser on-orbit orientation calibration method comprises the following steps: step 1, extracting laser data and terrain data; step 2, constructing a satellite-based laser height indicator geometric calibration model based on the extracted laser data; step 3, determining a calibrated laser orientation angle by utilizing a pyramidal searching method based on the terrain data extracted in the step 1 and the satellite-based laser height indicator geometric calibration model constructed in the step 2. The satellite-based laser on-orbit orientation calibration method disclosed by the invention can be widely applied to domestic satellite-based laser on-orbit geometric calibration; the method has small implementation difficulty and does not depend on waveform data; the satellite-based laser on-orbit orientation calibration method has important significance on capturing in primary ground calibration of a ground detector and high-precision geometric rough calibration of satellite-based laser.

Description

technical field [0001] The invention relates to the technical field of on-orbit geometric calibration of spaceborne lasers, in particular to a method for on-orbit pointing calibration of spaceborne lasers based on pyramid search and terrain matching. Background technique [0002] Space-borne laser altimetry is applied to high-resolution optical three-dimensional mapping satellites, and auxiliary space photogrammetry to improve satellite geometric accuracy, especially elevation accuracy, has become an important technical means. [0003] Due to the vibration during the satellite launch and the space-borne laser altimetry system, there will be system errors such as ranging, orbit, pointing angle, center of mass offset, and system clock synchronization during the measurement process, which will reduce the accuracy of the laser footpoint as elevation control. Therefore, it is necessary to perform on-orbit calibration on the parameters of the laser altimeter that affect the accura...

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 唐新明谢俊峰付兴科莫凡赵世湖高小明李国元朱广彬田世强
Owner 自然资源部国土卫星遥感应用中心
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