An internally damped inertial platform for marine gravimetry and a test case in the South China Sea

作     者：Pengfei WU Lin WU Lifeng BAO Long WANG Bo WANG Danling TANG Pengfei WU;Lin WU;Lifeng BAO;Long WANG;Bo WANG;Danling TANG

作者机构：State Key Laboratory of Geodesy and Earth’s DynamicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China University of Chinese Academy of SciencesBeijing 100049China Guangdong Remote Sensing Center for Marine Ecology and Environment(GDRS)Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2023年第41卷第2期

页      面：816-829页

核心收录：

学科分类：08[工学] 0816[工学-测绘科学与技术] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.42192535,41876136) the Guangdong Special Support Program(No.2019BT02H594) supported by the Key Special Projects of the Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(for Introduced Talents Team)(Nos.GML2021GD0810,GML2019ZD0602) 

主　　题：internally damped platform gyro-levelling loop marine gravimetry 

摘      要：To dampen periodic off-levelling motions within an inertial platform while undergoing horizontal accelerations of the same period and to achieve a levelling accuracy of a few tens of arcseconds with that system,an internally damped inertial platform for a marine scalar gravity system was the *** for attenuating horizontal acceleration and reducing off-levelling error by a satisfactory gyro-levelling loop,which are fundamental to the internally damped inertial platform,were designed and *** addition,phase delays are introduced by the levelling *** resulting off-levelling gravity errors were analyzed and modeled.A series of tests on a motion simulator were performed in laboratory for a variety of simulated sea *** found that the motion of the platform is a function of the amplitude and period of the simulated ship motions and ranges between 10 and 40 *** addition,the phase lag between platform motion and ship motion is not constant but ranges 180°-270°,depending on the period and amplitude of the ***,the platform,on which a gravimeter was mounted,was installed on the R/V Shiyan 2 to conduct a gravity survey in the South China *** rough sea conditions,it was shown that in short periods of 2-30 s,the off-levelling angle was less than 30 arcseconds,and the phase lagged the horizontal acceleration by 230°-260°.From a repeated survey line and intersecting survey points,the estimated errors of gravity measurements were between 1.3 and 1.7 *** marine measurements results were compared with those of satellite altimetry data and show a mean value of 0.5 mGal in a standard deviation of 1.5 mGal.