Precise Velocity Determination with GPS Doppler Measurements

Ching-Shun Ho, Jin-Zhong Chen and Chin-Tang Weng

Abstract:	This paper describes an approach to estimate precise velocity with using GPS Doppler Measurements. A mathematical model for Doppler Measurement is presented. The model includes the equations in obtaining GPS satellite velocity from broadcast information. To test the validity of the derived model, both static and dynamic experiments have been conducted with Ashtech Z-XII receivers. In the static tests, the results show that an accuracy of 30 cm/sec can be obtained under SA-on condition. If without SA, the solutions can be improved to be within 10 cm/sec. The further improvement can be done through a differential method. The derived model allows the computation of Doppler correction for each measurement. A dynamic experiment was performed on an X-table equipped with a motor to control the GPS antenna movement. The accuracy of one crn/sec can be obtained from the method.
Published in:	Proceedings of the 2001 National Technical Meeting of The Institute of Navigation January 22 - 24, 2001 Westin Long Beach Hotel Long Beach, CA
Pages:	223 - 227
Cite this article:	Ho, Ching-Shun, Chen, Jin-Zhong, Weng, Chin-Tang, "Precise Velocity Determination with GPS Doppler Measurements," Proceedings of the 2001 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2001, pp. 223-227.
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