Physics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978bolme..13..245d&link_type=abstract
(Inter-Union Commission on Radio Meteorology and U.S. Navy, Colloquium on Radio Oceanography, Hamburg, West Germany, Sept. 29-Oc
Physics
1
Orbit Calculation, Radio Altimeters, Satellite Orbits, Satellite-Borne Instruments, Error Correcting Devices, Geoids, Geos 3 Satellite, Histograms, Ocean Surface, Seasat Satellites
Scientific paper
The satellite-borne radar altimeters on GEOS 3 and Seasat produce high-precision measurement of distance from the satellite to the ocean surface. However, the precision of the GEOS 3 altimeter (approximately 50 cm) and especially the forthcoming Seasat instrument (about 10 cm) far exceeds the ability to determine the position of either satellite using conventional electronic or laser-tracking methods. Thus special techniques are required to prevent the uncertainty of the satellite position from degrading the value of the altimeter data. The altimeter data themselves provide a solution to this problem. Using the condition that intersections of passes of altimeter data must measure the same time-invariant part of the sea-surface height, the root-mean-square error of 292 intersections of 47 passes of GEOS 3 altimeter data from the Atlantic Ocean was reduced from 17 m to 44 cm. Simulations of the Seasat problem also show that altimeter data can aid in determining the satellite orbit and have their greatest value when radar or laser tracking is sparse.
Douglas Bruce C.
Goad Clyde C.
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