Carrier-phase integer ambiguity resolution (AR) is the key to improving the positioning accuracy of precise point positioning (PPP). However, in theory, the integer property of ambiguities in PPP are destroyed due to the absorption of phase biases. In this study, we analyzed a set of clock products consisting of a code clock, phase clock and wide-lane (WL) bias based on the decoupled clock (DCK) model, to facilitate PPP AR. The determination of the datum of the receiver clock as well as ambiguity were analyzed in detail to arrive at ways to eliminate rank deficiency. To fix ambiguity at the server end, we propose an approach by rounding directly with “fixing solution” (FS) and “partial ambiguity hold” (PAH) strategies, to increase the fixing rate and avoid the biased solution resulting from ambiguity datum loss. With respect to the International GNSS Service (IGS) legacy clocks, the mean standard deviations (STDs) of the phase clock and code clock were about 0.02 and 1.05 ns respectively, while the WL bias was about 0.12 cycles. Additionally, the convergence speed and stability of the decoupled phase clock are significantly improved compared with the conventional PPP model. Experiments on PPP positioning performance were conducted using 1 week of GPS data from more than 100 stations, considering the IGS weekly solutions as a benchmark. The ambiguity-fixed PPP with decoupled clocks had almost the same accuracy as the integer-recovered clock model, but the average accuracy improvements compared with the conventional PPP model in the east, north, and up components were 59.2, 32.4, and 20.3%, respectively, in the static mode, and approximately 38.0, 26.2, and 19.2% in the kinematic mode. These results demonstrate that users can achieve ambiguity-fixed solutions and obtain high-precision positioning coordinates with our decoupled clock products.

载波相位整数模糊度分辨率（AR）是提高精密单点定位（PPP）定位精度的关键。然而，理论上，由于相位偏差的吸收，PPP中模糊度的整数特性被破坏了。在本研究中，我们基于去耦时钟 (DCK) 模型分析了由代码时钟、相位时钟和宽通道 (WL) 偏置组成的一组时钟产品，以促进 PPP AR。详细分析了接收机时钟数据的确定和模糊度，得出了消除秩不足的方法。为了在服务器端修复歧义，我们提出了一种直接使用“固定解”（FS）和“部分歧义保持”（PAH）策略四舍五入的方法，以提高修复率并避免歧义数据丢失导致的偏差解。对于国际 GNSS 服务 (IGS) 传统时钟，相位时钟和代码时钟的平均标准偏差 (STD) 分别约为 0.02 和 1.05 ns，而 WL 偏差约为 0.12 个周期。此外，与传统的 PPP 模型相比，解耦相位时钟的收敛速度和稳定性显着提高。以 IGS 每周解决方案为基准，使用来自 100 多个站点的 1 周 GPS 数据进行了 PPP 定位性能实验。具有解耦时钟的模糊度固定 PPP 与整数恢复时钟模型的精度几乎相同，但与传统 PPP 模型相比，在东、北和向上分量的平均精度提高了 59.2、32.4 和 20.3%，分别在静态模式下，大约为 38.0、26.2、在运动学模式下为 19.2%。这些结果表明，用户可以通过我们的解耦时钟产品实现模糊度固定解决方案并获得高精度定位坐标。