The BeiDou global navigation satellite system (BDS-3) was formally commissioned to provide positioning, velocity, and timing services to global users on 31 July 2020. We analyzed its pseudorange measurement noise, the precision of conventional common view (CV) and all-in-view (AV) time comparison, and the instability of the precise point positioning (PPP) time transfer to assess the time transfer performance of BDS-3. We found that the elevation-dependent biases found in BDS-2 code measurements are mitigated in BDS-3. The time transfer performance of the BDS-3 satellites is over 50% higher than that of the BDS-2 satellites. In terms of the CV time comparison, the standard deviations of the zero-baseline common clock time comparison of the new BDS-3 signal combination of B1C and B2a reach 0.36 ns, which are the same levels for Galileo E1 and E5a and the global positioning system (GPS) L1 and L2. In the long baseline AV comparison links over 7000 km, the standard deviation of the ...

中文翻译：

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BDS-3信号的时移性能分析

北斗全球导航卫星系统（BDS-3）于2020年7月31日正式投入使用，为全球用户提供定位，速度和定时服务。我们分析了其伪距测量噪声，常规普通视点（CV）的精度以及所有视（AV）时间比较，以及精确点定位（PPP）时间传输的不稳定性来评估BDS-3的时间传输性能。我们发现在BDS-3代码测量中发现的与海拔相关的偏差已得到缓解。BDS-3卫星的时间传输性能比BDS-2卫星的时间传输性能高50％以上。在CV时间比较方面，B1C和B2a的新BDS-3信号组合的零基准公共时钟时间比较的标准偏差达到0.36 ns，与Galileo E1和E5a以及全球定位系统（GPS）L1和L2处于同一级别。在超过7000 km的长基线AV比较链接中，...的标准偏差...