Comparative Analysis of GPS Clock Performance Using Both Code-Phase and Carrier-Derived Pseudorange Observations
Abstract
The Naval Research Laboratory (NRL) has, for many years, determined the GPS space vehicle clock offsets by differencing the pseudorange observations and the post-fit orbit provided by the National Geospatial-Intelligence Agency (NGA). On 14 March 2004, NGA put into production a new class of pseudorange observations called carrier-derived pseudorange observations (CDP). Because the measurement noise of the new CDP observations is much lower than that of the code-phase pseudorange observations, NRL has begun to use the newer CDP observations in its analysis of GPS clock performance. A number of differences between the two types of data are pointed out, and a comparative analysis of clock performance with respect to frequency stability is reviewed. This work was performed under the sponsorship of the GPS Joint Program Office.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2004
- Accession Number
- ADA485217
Entities
People
- James A. Buisson
- Jay Oaks
- Marie M. Largay
- Wilson G. Reid
Organizations
- United States Naval Research Laboratory