Abstract—

Accuracy of range measurements using navigation satellites primarily depends on on-board clock correction parameters which are broadcasted to users periodically. The on-board clock offset, a critical correction parameter which accumulates due to fractional frequency offset as well as frequency drift, has to be maintained within the allocated broadcast limit throughout the satellite’s service. In IRNSS satellites, the clock offset is maintained within the broadcast limit by applying frequency offset corrections to the on-board atomic clock monitoring unit. In this paper, we discuss the methodology implemented for computing the clock offset using one-way range measurement data. Further, we report the time keeping methodology employed in IRNSS satellites that enables maintaining the satellite clock offset within the broadcast limit with minimum number of intervening frequency offset corrections throughout their operational life time.

中文翻译：

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IRNSS/NavIC 星座的卫星计时方法

摘要-

使用导航卫星进行距离测量的准确性主要取决于定期向用户广播的机载时钟校正参数。星载时钟偏移是一个关键校正参数，由于分数频率偏移和频率漂移而累积，必须在整个卫星服务期间保持在分配的广播限制内。在 IRNSS 卫星中，通过对机载原子钟监测单元应用频率偏移校正，将时钟偏移保持在广播限制内。在本文中，我们讨论了使用单向距离测量数据计算时钟偏移的方法。更远，