Stereo image positioning technology without ground control points assisted by optical axis position measurement data

doi:10.11947/j.AGCS.2024.20230173

Abstract

Abstract: In satellite photogrammetry, after the on-orbit calibration of the camera parameters, there are still low-frequency errors that vary with time and affect the location accuracy of satellite images in the absence of ground control points. Optical axis position measurement devices based on the optical self-collimation principle can be used to monitor the on-orbit camera parameter changes in real time. For global real-time or quasi-real-time image processing, this measurement data can be used to reduce the impact of low-frequency errors on the location accuracy of stereo images. Based on the working principle of the optical axis position measurement device, this paper establishes a model and algorithm for assisting stereo image positioning with optical axis position measurement data, and conducts experimental validation using GF-14 satellite data. The experimental results show that the use of optical axis position measurement data to assist stereo image positioning can achieve high location accuracy of satellite images without frequent on-orbit calibration of camera parameters and ground control points, and the location accuracy of images without ground control points is basically the same worldwide, reaching about 1.87 m in plane and about 0.73 m in elevation.

Key words: satellite photogrammetry, on-orbit calibration, optical axis position measurement, location without ground control points, GF-14 satellite data

CLC Number:

P236

WANG Jianrong, YANG Yuanxi, LU Xueliang, MIAO Yuzhe. Stereo image positioning technology without ground control points assisted by optical axis position measurement data[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(1): 1-7.

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