PRECISE MEASUREMENT METHOD FOR IONOSPHERIC TOTAL ELECTRON CONTENT USING SIGNALS FROM GPS SATELLITES

Hichito IMAE, Hitoshi KIUCHI, Akihiro KANEKO Shin'ichi HAHA, Chihiro MIKI

Abstract:	Communications Research Laboratory (CRL) has developed a GPS codeless receiver called "GTR-2" for treasuring total electron content (TEC) along the line of sight to the GPS satellite by using the cross correlation amplitude of the received P-code signals carried by L1(1575. 42NHz) and L2 (1227.6MHz). This equipment has the performance of uncertainty in the measurement of TEC of about 2 x 1016 electrons/12 when a 10 dBi gain antenna was used. To increase the measurement performance, CRL is planning an upper version of GTR-2 called GTR-3 which uses the phase information of the continuous signals obtained by making a cross correlation or multiplication of the received L1 and L2 P-code signals. By using the difference of these measured phase values, we can estimate the ionospheric delay with the ambiguities of the periods of Li+ L2 and L1 -12 signals. As the periods of these signals are about 3 ns and 0.3 ns respectively, then this method has the possibility of TEC measurement with the uncertainty of 1 or 2 times of 1015 electrons/aº of TEC. Additionally to the precise measurement of TEC, this method has the ability of the precise measurement of the pseudo-range between the GPS satellite and the receiver for the precise positioning.
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:	243 - 252
Cite this article:	IMAE, Hichito, KIUCHI, Hitoshi, HAHA, Akihiro KANEKO Shin'ichi, MIKI, Chihiro, "PRECISE MEASUREMENT METHOD FOR IONOSPHERIC TOTAL ELECTRON CONTENT USING SIGNALS FROM GPS SATELLITES," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 243-252.
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