NDLI: Delay variations in some GPS timing receivers

Content Provider	IEEE Xplore Digital Library
Author	Weiss, M. Zhang, V. Nelson, L. Hanns, V. Lopez Regalado, M. G.
Copyright Year	1997
Description	Author affiliation: Time & Frequency Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA (Weiss, M.)
Abstract	We report a number of studies of variations in the delay through GPS receivers used for timing at NIST. As a first study, the data from the receivers built at NIST in the early 1980's (called the NBS-type receiver) are compared over periods of many years to show variations in delay. These receivers vary of the order of 5 ns over a year, with the peak-to-peak variation of 10 ns over 6 years. A second study shows the temperature dependence of the antenna system and of the receiver unit of the NBS-type receiver. The antenna system of one receiver was held constant at 42/spl deg/C for the entire experiment. The antenna of another system was held at various fixed temperatures, and the relative delay through the two antennas was determined at each temperature. Similarly we varied the receiver temperature of one system, holding the antenna temperature constant. Though the delay varied 2 ns over the course of the experiment, this variation was not correlated with temperature. We next report the delay variation with temperature of a commercial multi-channel GPS receiver, which we are investigating for use in an alternative common-view receiver. We studied the temperature dependance of two receivers separate from the antenna. In one unit, we found a 2.3 ns a peak-to-peak variation of delay with temperature and a 4.3 ns peak-to-peak variation in the other, both over a range from 10/spl deg/C to 55/spl deg/C. The delay variation in both appears to be approximately quadratic over some range of temperature.
Starting Page	304
Ending Page	312
File Size	598341
Page Count	9
File Format	PDF
ISBN	078033728X
DOI	10.1109/FREQ.1997.638563
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-30
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Timing NIST Receiving antennas Delay effects Uncertainty Stability Frequency conversion Temperature dependence Temperature distribution
Content Type	Text
Resource Type	Article

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