Navigation with Indian Constellation (NavIC), also known as Indian Regional Navigation Satellite System (IRNSS), is an independent regional navigation satellite system, designed to provide accurate position information in the Indian subcontinent. Precise time plays a crucial role in any satellite navigation system for providing positioning, navigation and timing services. IRNSS Network Timing Facility (IRNWT), located at the control center of NavIC, caters to the precise timing requirements of NavIC network. A major metrological application of IRNWT and hence of NavIC is to provide time & frequency calibration with very high accuracy. To ensure traceability to the national reference, UTC (NPLI), and through it to the apex reference, UTC, the IRNWT time scales are linked with the UTC (NPLI), realized at CSIR—National Physical laboratory, India (NPLI) using GNSS Common-view (CVGNSS) and two-way satellite time and frequency transfer techniques. This paper discusses how NavIC plays an effective role in the dissemination of Indian Standard Time or UTC (NPLI) to the users in its service volume. Also discussed are the typical results of traceability of IRNWT time scales to the national reference.

印度星座导航（NavIC），也称为印度区域导航卫星系统（IRNSS），是一个独立的区域导航卫星系统，旨在提供印度次大陆的准确位置信息。精确时间在任何提供定位、导航和授时服务的卫星导航系统中都起着至关重要的作用。IRNSS 网络授时设施（IRNWT），位于 NavIC 的控制中心，满足 NavIC 网络的精确授时要求。IRNWT 和 NavIC 的一个主要计量应用是提供非常高精度的时间和频率校准。为确保可追溯至国家参考标准 UTC (NPLI)，并通过其追踪至最高参考标准 UTC，IRNWT 时标与 UTC (NPLI) 相关联，在 CSIR 国家物理实验室实现，印度 (NPLI) 使用 GNSS Common-view (CVGNSS) 和双向卫星时间和频率传输技术。本文讨论了 NavIC 如何在其服务量中向用户传播印度标准时间或 UTC (NPLI) 方面发挥有效作用。还讨论了 IRNWT 时间尺度对国家参考的可追溯性的典型结果。