为了准确评估在建守时系统的性能表现，设计并实施了一项依托全球导航卫星系统（GNSS）载波相位技术的远程评估方法。采用国家标准时间UTC(NTSC)作为基准，从位于中国西安与北京的2个地点，精心选取4个观测站点，连续15 d不间断收集了丰富的GNSS数据。在数据处理流程中，采用精密单点定位（PPP）与载波相位共视（PCV），以精确测定待测守时系统与UTC(NTSC)之间的时间偏差。在此基础上，进一步剖析了该守时系统的多项关键性能指标，特别是相对频率偏差和频率稳定性这2个方面。通过数据分析与对比，得出结论：PCV与PPP具有优越的时间传递性能，系统误差较小，达到了较高的精度水平，能够满足对远程守时系统频率稳定性和相对频率偏差进行精确评估的需求。本研究为国产守时系统的远程测试提供了有力的技术支撑，在提升时间同步技术精准度方面迈出了坚实的一步。

To accurately assess the performance of timekeeping system, we designed and implemented a remote evaluation method relying on global navigation satellite system(GNSS) carrier phase technology. Utilizing national time service center's UTC(NTSC) as the reference, we meticulously selected four observation stations from two locations in Xi'an and Beijing, China, where abundant GNSS data were continuously collected for 15 days without interruption. In the data processing workflow, we employed precise point positioning(PPP) and phase common view(PCV) to precisely determine the time deviation between the timekeeping system under test and UTC(NTSC). On the basis of this, we further analyzed the multiple key performance indicators of the timekeeping system, particularly focusing on relative frequency deviation and frequency stability. Through data analysis and comparison, it was concluded that PCV and PPP exhibit superior time transfer performance with small systematic errors, achieving a high level of accuracy that meets the requirements for precise evaluation of frequency stability and relative frequency deviation in remote timekeeping systems. The research provides robust technical support for the remote testing of domestic timekeeping systems and represents a solid step forward in enhancing the precision of time synchronization technology.