HIGH-ACCURACY DIFFERENTIAL POSITIONING FOR SATELLITE-BASED SYSTEMS WITHOUT USING CODE-PHASE MEASURMENTS

Frank van Graas and Shane-Woei Lee

Peer Reviewed

Abstract:	A novel, high-accuracy differential positioning technique for satellite-based systems is presented. The technique does not requir_e the use of code-phase measurements. Integrated Doppler double difference (ID 3) processing is used to converge the three-dimensional position of a dynamic user to within 1 m of the true position after l-2 min. Key elements of the ID 3 method are a very accurate propagation of the user position in combination with an iterative double difference processing scheme. The feasibility of the ID13 processing technique is demonstrated using both a computer simulation and actual flight test data. The technique requires measurements from seven or more satellites to achieve the short initialization time for dynamic users. This requirement can be satisfied with high availability by using all satellites from which the carrier phase can be tracked, in combination with a small reference station network that performs orbit determination for satellites used in the position solution. Some applications and benefits of the ID 3 processing technique are discussed as well.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 42, Number 4
Pages:	605 - 618
Cite this article:	van Graas, Frank, Lee, Shane-Woei, "HIGH-ACCURACY DIFFERENTIAL POSITIONING FOR SATELLITE-BASED SYSTEMS WITHOUT USING CODE-PHASE MEASURMENTS", NAVIGATION: Journal of The Institute of Navigation, Vol. 42, No. 4, Winter 1995-1996, pp. 605-618.
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