ADVANCED TECHNIQUES FOR THE REDUCTION OF GEODETIC SECOR OBSERVATIONS.
BROWN (D) ASSOCIATES INC EAU GALLIE FLA
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Techniques developed earlier see AD-425 480 for the self-calibration of tracking systems are applied to geodetic SECOR system. An error model for Geodetic SECOR is developed, special attention being devoted to inospheric refraction. The rigorous adjustment of SECOR observations with error-model recovery is developed first on a strictly geometric basis for the isolated quad quadrilateral. This development is extended to a special multi-quad net restricting parametric recovery to trajectory coordinates and station coordinates. It is then further extended to a general multi-quad net considering also the recovery of unstable error coefficients reinitialized for each orbital pass over each station. The adjustment is then reformulated to exercise short-arc orbital constraints, first for an unlimited number of passes over an isolated quad and subsequently for a net comprising an unlimited number of interconnected quads each observing an unlimited number of passes. This adjustment involves the simultaneous recovery of all station coordinates in the net, together with a fresh set of orbital elements and a fresh set of error coefficient for each pass. Results obtained from the application of the theory to data gathered from two test quads establish that the reduction has an impressive potential. Because it also automatically solves the problem of unresolved, constant ranging ambiguities, the new reduction promises a much shorter data reduction cycle than the conventional reduction. Author
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