SENSITIVITY TO THE EXTERNAL TEMPERATURE OF SOME GPS TIME RECEIVERS

W. Lewandowski, R. Tourde

Abstract:	It has been assumed until recently that GPS time receiver units (receiver + cables + antenna) have good stability and do not affect time transfer by more than 1 ns. Differences of a few nanoseconds sometimes observed during calibration campaigns have been attributed to external causes, such as multipath propagation, rather than to variations within the hardware. The characteristic feature of most comparisons of GPS time receivers is their short duration. Normally the comparison takes place, at most, over one week. To observe the behaviour of GPS time receivers over a period of several months, an experiment has been organised involving three receivers of two types. All three were connected to the same atomic clock. An unexpected sensitivity to external temperature was found in one type of receiver. This effect proved to be a function of the length and type of the antenna cable. In the most unfavourable case the sensitivity was 1.8 ns/°C.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	307 - 316
Cite this article:	Lewandowski, W., Tourde, R., "SENSITIVITY TO THE EXTERNAL TEMPERATURE OF SOME GPS TIME RECEIVERS," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 307-316.
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