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On the geodetic applications of simultaneous range-differencing to LAGEOSThe possibility of improving the accuracy of geodetic results by use of simultaneously observed ranges to Lageos, in a differencing mode, from pairs of stations was studied. Simulation tests show that model errors can be effectively minimized by simultaneous range differencing (SRD) for a rather broad class of network satellite pass configurations. The methods of least squares approximation are compared with monomials and Chebyshev polynomials and the cubic spline interpolation. Analysis of three types of orbital biases (radial, along- and across track) shows that radial biases are the ones most efficiently minimized in the SRC mode. The degree to which the other two can be minimized depends on the type of parameters under estimation and the geometry of the problem. Sensitivity analyses of the SRD observation show that for baseline length estimations the most useful data are those collected in a direction parallel to the baseline and at a low elevation. Estimating individual baseline lengths with respect to an assumed but fixed orbit not only decreases the cost, but it further reduces the effects of model biases on the results as opposed to a network solution. Analogous results and conclusions are obtained for the estimates of the coordinates of the pole.
Document ID
19830025016
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Pablis, E. C. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 4, 2013
Publication Date
December 1, 1982
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.26:170566
NASA-CR-170566
REPT-338
Accession Number
83N33287
Funding Number(s)
CONTRACT_GRANT: NAS5-25888
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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