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

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...

AI Technical Summary

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 have the ability to swing the entire satellite and are not suitable for satellite attitude maneuvering; the success rate of the airborne infrared camera imaging method is low. , it is difficult to implement

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