Astro-geodetic vertical deflection measurement and accuracy analysis based on image total station

doi:10.11947/j.AGCS.2023.20210486

Abstract

Abstract: High-accuracy astro-geodetic vertical deflection plays a key role in gravity model improvement as well as regional geoid refinement, et al. Now, the digital zenith camera is most widely used for astro-geodetic vertical deflection measurement, which suffers from some shortcomings, such as a complicated structure, large size and heavy weight, which makes it difficult to manufacture. A high cost and inconvenient transport are additional shortcomings. In this paper, the image total station is utilized for high-accuracy and automatic vertical deflections. The measurement principal and data processing method are briefly introduced, and 23 night field tests were conducted in Henan and Shaanxi province, using the image total station TS60 made by Leica company. The results shows that 12 minutes observations produced precisions of 0.18″~0.23″, which improved to 0.13″~0.19″ by increasing the observation time to 96 minutes, and the accuracy reaches 0.2″. Unlike digital zenith cameras, the image total station has merits of both high accuracy and efficiency, and even own the capability of single-person measurement, so it has a broad prospect of application.

Key words: vertical deflection, image total station, star image, celestial positioning, precision analysis

CLC Number:

P227

ZHAN Yinhu, ZHANG Chao, LI Feizhan, LUO Yabo, MI Kefeng, ZHANG Xu, ZHANG Zhifeng. Astro-geodetic vertical deflection measurement and accuracy analysis based on image total station[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(2): 175-182.

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