Compensation of gravitational attraction disturbance to pure gravity orbit for Inner Formation Flying System |
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| Institution: | 1. Department of Radiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China;2. Department of Neurology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China;1. Department of Biological Sciences, University of North Carolina, Charlotte, Charlotte, NC 28223 USA;2. Department of Cell Biology and Neuroscience, University of California, Riverside, Riverside, CA 95251, USA;3. Biology Department, Woods Hole Oceanographic Institution, 45 Water Street, Mailstop 33, Woods Hole, MA 02543 USA;1. The School of Psychological Sciences, Tel Aviv University, Ramat Aviv, Israel;2. Department of Psychology, Center for Studies in Behavioural Neurobiology/Groupe de Recherche en Neurobiologie Comportementale, Concordia University, Montreal, Canada;1. Institut Gustave-Roussy, service des affaires européennes et internationales, 114, rue Édouard-Vaillant, 94800 Villejuif, France;2. Institut Gustave-Roussy, comité de pathologie mammaire, 114, rue Édouard-Vaillant, 94800 Villejuif, France;3. Institut Gustave-Roussy, bibliothèque médicale, 114, rue Édouard-Vaillant, 94800 Villejuif, France;1. Science, Technology and Analysis Services, Veterinary Services (VS), Animal and Plant Health Inspection Service (APHIS), United States Department of Agriculture (USDA), 1920 Dayton Ave., Ames, IA 50010, United States;2. Center for Veterinary Biologics, VS, APHIS, USDA, 1920 Dayton Ave., Ames, IA 50010, United States;3. National Veterinary Services Laboratories, VS, APHIS, USDA, 1920 Dayton Ave., Ames, IA 50010, United States;4. National Animal Disease Center, Agricultural Research Service, USDA, 1920 Dayton Ave., Ames, IA 50010, United States;5. Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, United States |
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| Abstract: | The Inner Formation Flying System (IFFS) consisting of an outer satellite and an inner satellite which is a solid sphere proof mass freely flying in the shield cavity can construct a pure gravity orbit to precisely measure the earth gravity field. The gravitational attraction on the inner satellite due to the outer satellite is a significant disturbance source to the pure gravity orbit and is required to be limited to 10−11 m s−2 order. However, the gravitational disturbance force was on 10−9 m s−2 order actually and must be reduced by dedicated compensation mass blocks. The region of relative motion of the inner satellite about its nominal position is within 1 cm in dimension, which raises the complexity of the compensation blocks design. The iterative design strategy of the compensation blocks based on reducing the gravitational attraction at the nominal position of the inner satellite is presented, aiming to guarantee the gravitational force in the relative motion region within requirements after the compensation. The compensation blocks are designed according to the current status of IFFS, and the gravitational disturbance force in the region is reduced to 10−11 ms−2 order with minimized adding mass. |
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