Dynamic compensation method for attitude angle errors of optical remote sensing satellite based on ground navigation

Abstract

The invention discloses a dynamic compensation method for attitude angle errors of an optical remote sensing satellite based on ground navigation. The dynamic compensation method includes the following steps: (1) performing effectiveness processing on ephemeris data and attitude data downloaded from the satellite, namely eliminating outliers points in the data and re-determining the values of the points; (2) determining an extracting range of control points on a first level image which is an image corrected by radiation, determining an extracting range of control points on a reference image according to the extracting range on the first level image and data after processing in the step (1), intercepting the extracting ranges on the first level image and the reference image respectively, and generating one sub-image of the first level image which is an image subjected to radiometric correction and one sub-image of the reference image which is an orthoimage; (3) performing automatic pairing of the control points by adopting intercepted the sub-images of the first level image and the reference image, and eliminating mispairing points; (4) selecting at least 3 pairs of homonymy control points with different sequence orders and smallest Euclidean distances apart from a scenario center from the sub-images of the first level image and the reference image, and calculating attitude angle errors; and (5) performing compensation on an attitude angle of the optical remote sensing satellite by adopting determined attitude angle errors.

Description

technical field [0001] The invention belongs to the field of optical remote sensing satellite data processing and is suitable for optical remote sensing cameras. Background technique [0002] With the improvement of spatial resolution of domestic remote sensing satellites, the geometric positioning accuracy of remote sensing images has become an important inspection index. The positioning accuracy of remote sensing images is mainly affected by the accuracy of orbit data, attitude data, and on-board time synchronization. Using today's orbit determination technology, such as dual-frequency differential GPS orbit determination accuracy can reach the meter level or even higher; the current satellite time synchronization accuracy can reach the microsecond level, such as the satellite time synchronization accuracy is 1ms, and the satellite speed is 7.6 km / s, the satellite position deviation caused by time asynchrony is 0.44m; however, it is difficult to measure the attitude of th...

AI Technical Summary

Problems solved by technology

[0044] Second, in the process of attitude angle error calibration, the selection range of control points is too large

If the selected control point is far away from the main optical axis, its positioning deviation is caused by the factors of attitude angle error and lens distortion, and it is very difficult to decouple the two

The attitude angle error solved in this case is also inaccurate

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