Absolute calibration and evaluation of geodetic receivers

Proia, A.; Cibiel, Gilles; Yaigre, L.

doi:10.1109/eftf.2010.6533667

Cited by 1 publication

(2 citation statements)

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“…Currently, there are two widely used time-frequency calibration technologies: absolute calibration and relative calibration. Absolute calibration involves using the GPS signal simulator to measure the time differences between the simulator signal and the measured signal [4]. In 2009, Procia used absolute calibration to calibrate three time-frequency transfer receivers: Ashtech Z12-T, Septentrio PolaRx2, and Dicom GRT50.…”

Section: Introductionmentioning

confidence: 99%

“…In 2009, Procia used absolute calibration to calibrate three time-frequency transfer receivers: Ashtech Z12-T, Septentrio PolaRx2, and Dicom GRT50. Out of the three receivers, Septentrio PolaRx2 had the best short-term and long-term stability in terms of hardware delay [5]. Nevertheless, absolute calibration has a significant drawback as it heavily relies on professional equipment, making it costly and difficult to apply widely.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of receiver calibration based on clock-steering for time–frequency transfer

Guo,

Chen,

Gong

et al. 2023

Meas. Sci. Technol.

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Calibrating the Global Navigation Satellite System (GNSS) time-frequency transfer system is crucial for accurate GNSS time-frequency transfer. The most commonly used relative calibration method relies on the common-clock to eliminate clock differences. However, it cannot eliminate the changes in clock signal reference point delay (REFDLY). The changes in REFDLY during calibration could not be ignored, especially for ordinary users in an unstable environment. To address this issue, we use the GNSS real-time single-difference (GNSS-RTSD) time synchronization calibration based on clock-steering, which can detect the change in REFDLY. According to this method, the clock differences and REFDLY are eliminated simultaneously. We installed two GNSS antennas on the roof of the Xinghu Building of Wuhan University and designed a clock synchronization terminal to evaluate the performance of this method. The data were collected on Day Of Year (DOY) 152~156, 167~171, 222~226, 231~235, 244, 258, 260, and 262 in 2022. In accordance with the calibration results, the standard deviation better than 100ps, and the stability reaches 10^{-15}@10000s. Also, the time variance better than 60ps, and the uncertainty u_{CAL} better than 0.5 ns. Compared to the common-clock calibration, one of the most significant benefits is the elimination of REFDLY, which leads to decreased uncertainty and better stability over both the short-term and long-term.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%