Abstract
According to the problem that the low measurement accuracy of TH-1 satellite star sensor, the low frequency and “slow drift” error which cannot be ignored in the attitude determination system, resulting in obvious random error in the horizontal position and elevation direction, and the change of the error with time and latitude, cannot be calibrated by the ground field of the real problem. In this paper, a low frequency detection model is established by using the principle of relative orientation, and the low frequency error is obtained by parallax elimination. Finally, the satellite attitude is compensated and the more accurate exterior orientation elements are obtained, thus improving the positioning accuracy and stability. The experimental results show that: the proposed methods are feasible, and by using the model to dynamically calibrate the exterior orientation angle elements on orbit, the plane and elevation errors of the ground points can be basically eliminated. The global uncontrollable positioning accuracy and stability of the photogrammetry satellite are improved.
Highlights
IntroductionIt is an important problem that high-precision positioning accuracy without ground control points (GCPs), which is plaguing the acquisition of high-precision geographic information
According to the problem that the low measurement accuracy of TH-1 satellite star sensor, the low frequency and “slow drift” error which cannot be ignored in the attitude determination system, resulting in obvious random error in the horizontal position and elevation direction, and the change of the error with time and latitude, cannot be calibrated by the ground field of the real problem
A low frequency detection model is established by using the principle of relative orientation, and the low frequency error is obtained by parallax elimination
Summary
It is an important problem that high-precision positioning accuracy without GCPs, which is plaguing the acquisition of high-precision geographic information. The geometric calibration technique is used to calibrate the error of the external orientation elements in the calibration field [6] [7] In this way, the requirements for positioning without GCPs can be achieved. The TH-1 satellite adopts the unique EFP (Equivalent Frame Photo) bundle adjustment, and the low-frequency error compensation technology is proposed on this basis, which realizes the global uncontrolled high-precision positioning, achieving the positioning accuracy of 3.7 m on plane and 2.4 m on elevation which meets the mapping accuracy requirement of 1:25000 geographic information product [12]. The positioning accuracy of satellite images is improved by compensating low frequency error of the pitch angle and yaw angle. Low-Frequency Error Compensation Model for Exterior Orientation Angle Elements
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