Testing Motorola Oncore GPS Receiver and Temperature-Stabilized Antennas for Time Metrology

W. Lewandowski, P. Moussay, P. Guerin, F. Meyer, M. Vincent

Abstract:	With GPS now fully operational, the market for GPS navigation receivers is booming and one can purchase a multichannel GPS pocket-sized receiver for only a few hundred dollars. One of them, the Motorola Oncore eight-channel one-frequency receiver, is of special interest for timing bemuse it provides a I pps output. Preliminary results of tests with the BIPM international GPS common-view schedule are given in this paper. One identified source of instability in GPS time receiver hardware is a dependence on external temperature. This is typically of about 0.2 ns/'C and can approach 2 ns'C for some types of receivers. In this paper it is shown that this problem can be resolved by enclosing antennas in temperature-stabilized ovens. Results are reported for Motorola and TTR6 Allen Osborne antennas.
Published in:	Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1996 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	387 - 396
Cite this article:	Lewandowski, W., Moussay, P., Guerin, P., Meyer, F., Vincent, M., "Testing Motorola Oncore GPS Receiver and Temperature-Stabilized Antennas for Time Metrology," Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1996, pp. 387-396.
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