Analysis of GPS Data Processing Techniques: In Search of Optimized Strategy of Orbit and Earth Rotation Parameter Recovery
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Date
1995-10
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Ohio State University. Division of Geodetic Science
Abstract
One of the two major problems addressed here is the application of the triple-difference technique in the Global Positioning System (GPS) orbit determination. It represents an innovative, high-standard, and optimal approach to the recovery of the GPS trajectory. The implementation of triple-difference requires special consideration of the correlation that is introduced into the data set via subsequent differencing, but it reduces significantly the number of parameters that need to be evaluated. Another purpose of this research is GPS-based determination of rotational time and pole coordinates (Earth Rotation Parameters, ERPs ), under different conditions such as different troposphere modeling, different nutation model, and variation of the ERP model itself In particular, determination of diurnal and semidiurnal Universal Time (UT1) with satellite technique is discussed. The triple-difference technique, although not new as a concept of GPS data processing but certainly innovative in the field of orbit determination, has demonstrated remarkable processing capacity, flexibility, efficiency, and reliability. The validity and high precision of the triple-difference solution for GPS orbits and ERPs was confirmed by the consistency and repeatability tests for long baselines, showing the RMS ranging from a few parts in 108 to a few parts in 109 per coordinate. Also, the short-periodic UT1 series derived from GPS shows good agreement with the VLBI-derived empirical model of Herring. [Some mathematical expressions are not fully represented in the metadata. Full text of abstract available in document.]