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Experiments for improved positioning by means of integrated Doppler satellite observations and the NNSS broadcast ephemerisAn effort to improve station position recovery using broadcast ephemeris in Doppler data reduction was studied. A comparison of precise and broadcast ephemerides, treating the former as the standard, yielded information about the state disturbance that can be associated with the broadcast ephemeris. Statistical information about the state disturbance was used with current observational data for improved position recovery. The rank deficiency problem encountered in the short arc geodetic adjustment procedure was analysed and it was deduced that the fundamental rank deficiency is six, scale information being derivable from the wavelength of transmission. Coordinate differences between stations coobserving a pass are estimable. The uncertainty of the broadcast ephemeris, now in the WGS72 system, was assessed. It was conservatively estimated that its positional uncertainty may vary between 19 to 26 m in-track, 15 to 20 m cross-track and 9 to 10 m in radial directions depending on the incidence of the epoch of observations in the interinjection period.
Document ID
19780009311
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Arur, M. G. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1977
Subject Category
Communications And Radar
Report/Patent Number
NASA-CR-155735
REPT-258
Accession Number
78N17254
Funding Number(s)
OTHER: NGR-36-004-204
PROJECT: OSURF PROJ. 783820
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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