Abstract
Abstract. As the satellite latitude and camera temperature changes, temperature distortion in orbit makes the optical axis of the star sensor drifts slowly in the satellite body coordinate system, and the attitude measurement system contains low frequency errors that cannot be ignored. Low frequency errors are systematic in short periods, and occasional in long periods, which cause an error of a few minutes, so as to greatly reduce the positioning accuracy without control points of satellite photography. Traditional geometric calibration can only eliminate system errors caused by changes in optics in sensor platform and mechanical structures and etc., and cannot reduce the effect of low-frequency errors. An integrated static and dynamic geometric calibration method based on optical surveying and mapping satellites is proposed in this paper. The attitude system error and low frequency error are effectively detected by establishing a correction model of low frequency errors and analyzing the effective calibration process of traditional on-orbit calibration and dynamic calibration. Finally, relevant experiments are performed with image from satellite TIANHUI-1 in seven test fields, which verifies that this low-frequency error compensation method is correct and effective.
Highlights
On-orbit geometric calibration of optical satellite can eliminate system errors caused by changes of optics in sensor platform and mechanical structures and etc., and reduce the geometric distortion of the image, which is the key step to achieve photogrammetry without ground control points
In satellite photogrammetry with ground control points, it is possible to use the ground control points to control the effect of low-frequency errors of attitude measurement system
The attitude system error and low frequency error are effectively detected by establishing a correction model of low frequency errors and analysing the effective calibration process of traditional onorbit calibration and dynamic calibration
Summary
On-orbit geometric calibration of optical satellite can eliminate system errors caused by changes of optics in sensor platform and mechanical structures and etc., and reduce the geometric distortion of the image, which is the key step to achieve photogrammetry without ground control points. After in-orbit geometric calibration of the satellite and through the test of positioning accuracy in other regions around the world, there is still a significant error in the horizontal and elevation accuracy of the satellite image This error is systematic in a short period, and occasional in a long period, which is a kind of low-frequency error that cannot be ignored in satellite attitude measurement system (Wang et al, 2015, 2016). Wang Renxiang was the first to survey and map topographic map with scale of 1:50000 from TIANHUI-1 with lower attitude stability and star sensor accuracy without ground control points using Equivalent Frame Photo Bundle Adjustment method of the satellite Three-LineArray image and eliminating low-frequency errors by vertical parallax(Wang et al, 2016). Relevant experiments are performed with image from satellite TIANHUI-1 in seven test fields, which improves the accuracy of satellite positioning without control points and verifies that this low-frequency error compensation method is correct and effective
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