Co-OP Tracking for Carrier Phase

M. Zhodzishsky, S. Yudanov, V. Veitsel, J. Ashjaee

Abstract:	Co-Op tracking (patent pending) improves the tracking capability of the GPS and GLONASS receiver by a factor of 10. The improvement is based on two types of simultaneous phase lock loops (PLLs). One PLL tracks the apparent dynamics of the receiver, including the receiver dynamics and internal oscillator. This PLL uses the total power of all the satellites in view and can have a wide bandwidth on the order of 20 Hz. The second type of PLL is designed to track the apparent dynamics of each satellite. There are one of these types of PLLs dedicated for each satellite. These individual loops have comparatively narrow bandwidths of about 2 Hz. This scheme provides an order of magnitude improvement in tracking capability of the receiver while at the same time reduces the measurement noise by a factor of 10. The improvement in tracking capability stems from using the total power of all the satellites together. The improvement in the reduction of noise effects is the result of very narrow bandwidths of the individual tracking loops.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	653 - 664
Cite this article:	Zhodzishsky, M., Yudanov, S., Veitsel, V., Ashjaee, J., "Co-OP Tracking for Carrier Phase," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 653-664.
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