Made-in-China satellite laser altimeter on-orbit geometric calibration method and system

Abstract

The invention discloses a made-in-China satellite laser altimeter on-orbit geometric calibration method and a made-in-China satellite laser altimeter on-orbit geometric calibration system. The made-in-China satellite laser altimeter on-orbit geometric calibration method comprises the steps of: measuring terrain of a calibration field by utilizing an airborne laser radar or GPS before satellite top-crossing; fitting a surface geometry model of the calibration field by adopting laser radar point clout data or ground GPS measurement data; and placing a laser point of a satellite laser altimeter on a known plane as a constraint condition, establishing a satellite laser altimeter strict geometric calibration model, utilizing a least square principle, and solving a geometric calibration parameter of the satellite laser altimeter. The made-in-China satellite laser altimeter on-orbit geometric calibration method and the made-in-China satellite laser altimeter on-orbit geometric calibration system can effectively solve the problem that positioning precision of a laser spot is not high due to installation deviation of the satellite laser altimeter and errors of laser range finding by utilizing ground natural terrain during satellite transition, increase measuring precision of the made-in-China satellite laser altimeter, and have high applicability and practical value.

Description

technical field [0001] The invention belongs to the technical field of remote sensing and earth observation, and in particular relates to an on-orbit geometric calibration method and system for a domestic satellite laser altimeter. Background technique [0002] Satellite laser altimeter is an active remote sensing technology that installs a laser altimeter on a satellite platform to achieve earth observation. As one of the most important payloads for deep space exploration, it has controllable laser footprint size, precise laser beam pointing and high-precision measurement, etc. Advantages, almost all aerospace projects are equipped with this sensor. However, the measurement accuracy of the laser altimeter for earth observation is affected by many factors, among which laser ranging and laser beam pointing will directly cause the position of the laser spot to shift, and the ranging of the laser altimeter is mainly affected by factors such as the atmosphere and time measuremen...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies in the prior art, and provide a method and system for on-orbit geometric calibration of a domestic satellite laser altimeter. The topographical features irradiated by the satellite laser altimeter on the ground surface are used as calibration constraints, and the least square method is used to calculate the system geometry. Calibration parameters overcome the problem of high cost of satellite laser altimeter on-orbit calibration

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