GPS phase accelerations for moving-base vector gravimetry |
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| Authors: | C Jekeli R Garcia |
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| Institution: | (1) Department of Civil and Environmental Engineering and Geodetic Science, The Ohio State University, 2070 Neil Ave., Columbus, OH 43210, USA Tel:+1614 292 7117; fax:+1614 292 2957; e-mail: jekeli.1@osu.edu, US |
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| Abstract: | For airborne gravimetry using INS and GPS, the accelerations from both systems are differenced to yield the gravity acceleration.
Usually, the GPS acceleration is determined by first solving for the position of the vehicle relative to a base station and
subsequently taking two time derivatives of the vertical component. An alternative method is to time-differentiate the observed
phases directly, thus avoiding the cycle ambiguity problem that must be solved for positioning and that is fraught with (certainly
not insurmountable) difficulties in the event of a cycle slip. Due to the largely unpredictable receiver-clock errors and
the imposition of the Selective Availability degradation, doubly differenced (in space) phase accelerations are used to obtain
the relative vehicle accelerations. Test results for stationary receivers show that the acceleration vector can be determined
from phase accelerations to an accuracy of 1 mgal for 40-s averages. The mathematical formulation of the acceleration determination
also highlights certain other advantages over traditional methods, such as the avoidance of the E?tv?s correction, although
a similar kind of velocity effect must be determined.
Received: 9 September 1996 / Accepted: 14 April 1997 |
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| Keywords: | , Moving-base gravimetry,GPS acceleration,vector gravimetry,phase accelerations |
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