Modeling of errors resulting from vehicle motions for CHZII mobile gravimeter and its performance verification during marine surveys

• Published in: Applied geophysics 2023-12, Vol.20 (4), p.592-599
• Main Authors: Tu, Hai-bo, He, Jian-gang, Hu, Ming, Liang, Xing-hui, Liu, Lei-jun, Dong, Qin-qin, Liu, Sun-jun, Zhang, Hui, Fu, Yong-tao, Lang, Jun-jian, Sun, Heng, Liu, Lin-tao
• Format: Article
• Language: English
• Subjects: Earth and Environmental Science; Earth Sciences; Errors; Geodesy; Geophysics; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Gravimeters; Gravity meters; Gravity surveys; Prototypes; Stabilized platforms; Surveys; Working conditions
• ISSN: 1672-7975; 1993-0658
• DOI: 10.1007/s11770-021-0886-2

Mobile gravity survey plays a paramount role in many research fields, particularly geophysics and geodesy. Mobile gravimeters with delicate mechanisms and gyroscope-stabilized platforms are robust to motion-induced errors. In the past few years, a novel spring-based mobile gravimeter, CHZII, constructed with a sensitive probe based on an axisystematic mechanism and supported by a two-axis gyro platform, has been developed for mobile gravity surveys. This study mainly analyzes the system and models measurement errors derived from carrier motions. The system’s performance was varied in a laboratory and on the sea. The constructed system experimentally shows that the residual error introduced by carrier motions is less than 1 mGal (∼1 × 10 −5 m/s 2 ) in general working conditions due to the delicate mechanical design and precise assembly. A repeatability test for the CHZII engineering prototype and a comparison test with a KSS32 gravimeter have been conducted in 2016–2017, demonstrating that the measurement accuracy approaches 1.1 mGal, which is con-sistent with the expectation.