Abstract
A new error adjustment method for remote synchronization of the onboard crystal oscillator for the quasi‐zenith satellite system (QZSS) using three different frequency positioning signals (L1/L2/L5) is proposed. The error adjustment method that uses L1/L2 positioning signals was demonstrated in the past. In both methods, the frequency‐dependent part and the frequency‐independent part were considered separately, and the total time information delay was estimated. By adopting L1/L2/L5, synchronization was improved by approximately 15% compared with that using L1/L2 and approximately 10% compared with that using L1/L5 and a synchronization error of less than 0.77 nanosecond was realized.
Highlights
The Japanese Quasi-Zenith Satellite (QZS) System (QZSS) is a three-satellite navigation/positioning system conceived to improve the positioning performance of the presently available global positioning system (GPS) in urban areas where high-rise buildings reduce the number of visible GPS satellites [1]
Various delay models are used for the estimation of the delay of the RESSOX control signal that includes time information of quasi-zenith satellite system (QZSS) time and is advanced with respect to QZSS-time to compensate the delay during transmission
Pseudoranges of positioning signals obtained at the ground station, named the time management station (TMS), are used for error adjustment, where QZSSTime is a standard time of QZSS, like GPS time for GPS, and refers to UTC (NICT)
Summary
The Japanese Quasi-Zenith Satellite (QZS) System (QZSS) is a three-satellite navigation/positioning system conceived to improve the positioning performance (satellite availability and position accuracy) of the presently available global positioning system (GPS) in urban areas where high-rise buildings reduce the number of visible GPS satellites [1]. Various delay models are used for the estimation of the delay of the RESSOX control signal that includes time information of QZSS time and is advanced with respect to QZSS-time to compensate the delay during transmission This is considered to be the feed-forward control. Pseudoranges of positioning signals obtained at the ground station, named the time management station (TMS), are used for error adjustment, where QZSSTime is a standard time of QZSS, like GPS time for GPS, and refers to UTC (NICT). This is considered to be the feedback control. The RESSOX control signal is transmitted with the Ku-band from the TMS
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