High-Accuracy Differential Positioning for Satellite-Based Systems Without Using Code-Phase Measurements

Frank van Graas and Shane-Woei Lee

Abstract:	A novel, high-accuracy differential positioning technique for satellite-based systems is presented. The technique does not require the use of code-phase measurements. Integrated Doppler shifi Double Difference (IDA3) processing is used to converge the threedimensional position of a dynamic user to within 1 meter of the true position after l-2 minutes. Key elements of the IDA3 method are a very accurate propagation of the user position in cumbination with an iterative double difference processing scheme. The feasibility of the IDA3 procmsing 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 all satellites used in the position solution. Some applications and benefits of the ID*3 processing technique are discussed as well.
Published in:	Proceedings of the 1995 National Technical Meeting of The Institute of Navigation January 18 - 20, 1995 Disneyland Hotel Anaheim, CA
Pages:	231 - 239
Cite this article:	van Graas, Frank, Lee, Shane-Woei, "High-Accuracy Differential Positioning for Satellite-Based Systems Without Using Code-Phase Measurements," Proceedings of the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 1995, pp. 231-239.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In