Performance testing of time comparison using GPS-smoothed P3 code and IGS ephemerides

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...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2005-04, Vol.54 (2), p.825-828
Main Authors: Peng, H.-M., Liao, C.-S., Hwang, J.-K.
Format: Article
Language:English
Subjects:
C (programming language)
Clocks
Code standards
Elevation
Ephemerides
Extraterrestrial measurements
Frequency
Geographic information systems
Global Positioning System
Global positioning system (GPS)
Global positioning systems
GPS
Instrumentation
Laboratories
Noise level
P code
Phase measurement
Satellite broadcasting
Satellite navigation systems
Satellites
Testing
time transfer
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Summary: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.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2004.843402