Current Issues in Kinematic Navigation

Ronald R. Hatch

Abstract:	This paper is aimed at clarifying various aspects of kinematic or differential carrier phase GPS. Four related topics are addressed. The first topic, time recovery and clock synchronization, is concerned with ensuring that the time of measurement is syn- chronized at the reference and kinematic receivers. It is shown that the pseudorange measurements, even when the Selective Availability degradation is turned on, can be used to recover time accurate enough that less than one millimeter of noise will be introduced into the carrier phase measurements. The second topic, transmission of carrier phase corrections rather than the raw measurements, is designed to show that a number of advantages ac- crue from such a scheme. Among the advantages are: (1) fewer bits are required to transmit the cor- rections; (2) a reduced time sensitivity of the trans- mitted data which makes time synchronization, data latency and link reliability a little less critical; and (3) a reduced computational load at the kinematic receiver. The third topic, rendezvous and relative naviga- tion, is addressed because there seems to be a mis- understanding about the relative nature of the standard differential pseudorange correction scheme. It is argued that the standard scheme is, in fact, relative and can even be used in situations where the reference receiver is moving. The last topic addressed is the subject of relativity corrections. It is argued that current theory and experiment are in disagreement. An alternate the- ory is discussed and the evidence from kinematic navigation, together with other simple experiments, is shown to support the alternate theory.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	1063 - 1070
Cite this article:	Hatch, Ronald R., "Current Issues in Kinematic Navigation," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 1063-1070.
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