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《Chinese Journal of Geophysics》 2003-01
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DETERMINATION OF MOVING-BASE ACCELERATION IN AIRBORNE GRAVIMETRY

XIAO YUN XIA ZHEREN Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China  
Airborne gravimetry is a new technique for determination of earth gravity, in which Gravimeter, GPS and other sensors are used. The basic theory is that Gravimeter senses the total acceleration including gravity signal, inertial acceleration and other accelerations, and GPS determines inertial acceleration of moving-base, then gravity will be yielded if inertial acceleration can be subtracted from total acceleration with some corrections. Therefore, determination of inertial acceleration by using GPS is one of key problems. A mathematic model of direct calculation method was deduced in this paper. The data from an airborne gravimetry were tested. Finally, acceleration precise was evaluated in static and kinematic condition. The results indicated that the acceleration accuracy at 0.4-0.9mGal level can be achieved during 60s interval in static condition and 1-3mGal level can be achieved in 90s interval in kinematic condition.
【Fund】: 国家攀登计划“九五”项目
【CateGory Index】: P223
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