Improvement of Time Comparison Results by using GPS Dua1 Frenquency Codeless Receivers Measuring Ionospheric Delay

M. Imae, C. Miki, C. Thomas

Abstract: A dual, frequency CPS receiver measuring ionospheric delay or TEC (Total Electron Content) named CTR-2 was constructed in BIPM (Bureau International des Poids et Mesures)[1], and operates in regular base since October 1988. CRL (Communications Research Laboratory) also has completed a development of the same equipment this year. Tt has almost same performances as GTR-2 in BIPM. By using these two receivers, we have begun to compensate the time transfer results obtained from the conventional GPS time transfer receivers between Japan and Europe under the cooperation of CRL and BTPM for a construction of a tight time-transfer link by using GPS satellite. This paper shows the improvement of CPS time transfer results by using the ionospheric delays measured by GTR-2. For a highly transportable geodetic purpose VLBI (Very Long Baseline Interferometer) station, CRL. has another application program of GTR-2. For this compact VI.BI station, we are making a study of ionospheric compensation of the signal from radio stars by using the TFC date obtained from GTR-2. CRL also have a plan of an improved version of GTR-2 which uses the phase informations of reconstructed continuous signals obtained by making cross correlation of the received LI(1575.42 MHz) and L2(1227.6 MHz) signals from the GPS satellites. By using this method, it can be estimated that this equipment can make more than 12TIC order of precise measurement of the TEC than GTR-2.
Published in: Proceedings of the 21th Annual Precise Time and Time Interval Systems and Applications Meeting
November 28 - 30, 1989
Sheraton Hotel
Redondo Beach, California
Pages: 199 - 204
Cite this article: Imae, M., Miki, C., Thomas, C., "Improvement of Time Comparison Results by using GPS Dua1 Frenquency Codeless Receivers Measuring Ionospheric Delay," Proceedings of the 21th Annual Precise Time and Time Interval Systems and Applications Meeting, Redondo Beach, California, November 1989, pp. 199-204.
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