GPS Carrier-Phase Frequency Transfer on the NIMA Monitor Station Network

B.W. Tolman, D. Munton

Abstract:	The National lmagery and Mapping Agency (NlMA) maintains a worldwide GPS Monitor Station Network (MSN). We are in the process of studying carrier-phase frequency transfer as one method for understanding the overall network performance, and for potential use in testing future GPS receivers. We have developed processing software that uses 30-second dual frequency data in a continuous sequential estimator, which allows unlimited forward processing as well as optional backwards vied-interval) smoothing. States in the estimation include tropospheric and ionospheric delays, corrections (assumed small) to the station positions, and double-differenced carrier-phase biases. Satellite positions are taken from either precise or broadcast ephemerides. We have tested our process using both zero-baseline datasets and benchtop tests. Our initial results indicate that instabilities seen in the estimated time offsets are dominated by temperature variations coupling to the GPS receiver used.
Published in:	Proceedings of the 33th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 27, 2001 Hyatt Regency Long Beach Long Beach, California
Pages:	221 - 232
Cite this article:	Tolman, B.W., Munton, D., "GPS Carrier-Phase Frequency Transfer on the NIMA Monitor Station Network," Proceedings of the 33th Annual Precise Time and Time Interval Systems and Applications Meeting, Long Beach, California, November 2001, pp. 221-232.
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