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Calibration of galileo signals for time metrology

机译：校准伽利略信号以进行时间计量

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摘要

Using global navigation satellite system (GNSS) signals for accurate timing and time transfer requires the knowledge of all electric delays of the signals inside the receiving system. GNSS stations dedicated to timing or time transfer are classically calibrated only for Global Positioning System (GPS) signals. This paper proposes a procedure to determine the hardware delays of a GNSS receiving station for Galileo signals, once the delays of the GPS signals are known. This approach makes use of the broadcast satellite inter-signal biases, and is based on the ionospheric delay measured from dual-frequency combinations of GPS and Galileo signals. The uncertainty on the so-determined hardware delays is estimated to 3.7 ns for each isolated code in the L5 frequency band, and 4.2 ns for the ionosphere-free combination of E1 with a code of the L5 frequency band. For the calibration of a time transfer link between two stations, another approach can be used, based on the difference between the common-view time transfer results obtained with calibrated GPS data and with uncalibrated Galileo data. It is shown that the results obtained with this approach or with the ionospheric method are equivalent.
机译：使用全球导航卫星系统（GNSS）信号进行精确的定时和时间传输需要了解接收系统内部信号的所有电延迟。专门用于定时或时间传输的GNSS站通常仅针对全球定位系统（GPS）信号进行校准。一旦GPS信号的延迟已知，本文提出了确定伽利略信号的GNSS接收站的硬件延迟的程序。这种方法利用了广播卫星的信号间偏差，并且基于从GPS和Galileo信号的双频组合测得的电离层延迟。对于L5频带中的每个隔离代码，如此确定的硬件延迟的不确定性估计为3.7 ns，对于E1与L5频带的代码的无电离层组合，估计为4.2 ns。对于两个站之间的时间传输链接的校准，可以使用另一种方法，基于使用已校准GPS数据和未校准Galileo数据获得的共视时间传输结果之间的差异。结果表明，用这种方法或电离层方法获得的结果是等效的。

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