Opportunistic Frequency Stability Transfer for Extending the Coherence Time of GNSS Receiver Clocks

K.D. Wesson, K.M. Pesyna, Jr., J.A. Bhatti, T.E. Humphreys

Abstract:	A framework is presented for exploiting the frequency stability of non-GNSS signals to extend the coherence time of inexpensive GNSS receiver clocks. This is accomplished by leveraging stable ambient radio frequency signals, called “signals of opportunity,” to compensate for the frequency instability of the reference oscillators typically used in inexpensive handheld GNSS receivers. Adequate compensation for this frequency instability permits the long coherent integration intervals required to acquire and track GNSS signals with low carrier-to-noise ratios. The goal of this work is to push the use of GNSS deeper indoors or into environments where GNSS may be subject to interference.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2959 - 2968
Cite this article:	Wesson, K.D., Pesyna, K.M., Jr.,, Bhatti, J.A., Humphreys, T.E., "Opportunistic Frequency Stability Transfer for Extending the Coherence Time of GNSS Receiver Clocks," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2959-2968.
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