DocumentCode :
748318
Title :
Performance testing of time comparison using GPS-smoothed P3 code and IGS ephemerides
Author :
Peng, Hsin-Min ; Liao, Chia-Shu ; Hwang, Jeng-Kuang
Author_Institution :
Telecommun. Labs., Chunghwa Telecom Co. Ltd., Taiwan, Taiwan
Volume :
54
Issue :
2
fYear :
2005
fDate :
4/1/2005 12:00:00 AM
Firstpage :
825
Lastpage :
828
Abstract :
In this paper, the characteristics of time transfer using global positioning system (GPS)-smoothed P3 code and International GPS Service (IGS) precise ephemerides are studied. Recently, GPS P3 code has been used in International Atomic Time (TAI) computation as a substitute for GPS C/A code; however, this observation still has large variations when satellites are at low elevation angles. For acquiring more stable time comparison results, we adopt a carrier smoothing technique to reduce this noise. The IGS precise ephemerides are also used to reduce satellite orbital errors in order to obtain better results. To test our program for use in international time transfer, we processed GPS data between various laboratories using the smoothed P3 code and IGS ephemerides. We then compared these results to those obtained using unsmoothed P3 code and broadcast ephemerides. This test shows that using the smoothed P3 code and IGS ephemerides can reduce the uncertainty of GPS time comparison.
Keywords :
Global Positioning System; time measurement; transfer standards; GPS C/A code; GPS-smoothed P3 code; International Atomic Time computation; International GPS Service; carrier smoothing technique; ephemerides; global positioning system; international time transfer; noise reduction; performance testing; satellite orbital errors; satellites; time comparison; Clocks; Code standards; Extraterrestrial measurements; Frequency; Global Positioning System; Laboratories; Noise level; Phase measurement; Satellite broadcasting; Testing; Global positioning system (GPS); P code; time transfer;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.2004.843402
Filename :
1408298
Link To Document :
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