时频传递的改进整数相位钟方法

整数相位钟法是精密单点定位（PPP）中应用最广泛的模糊度固定方法之一。利用整数相位钟法进行频率传递的稳定度优于传统PPP，但该方法的钟差计算结果包含系统性偏差，影响时间传递精度。本文介绍了整数相位钟法基本原理，分析了钟差计算结果所包含的系统性偏差成因，提出一种基于星间单差模糊度固定与原子钟精化模型的改进整数相位钟法，并检验改进整数相位钟法的模糊度固定性能与时频传递性能。试验结果表明，改进算法能够有效消除该系统性偏差，利用改进整数相位钟法进行时间传递精度能够达到0.1~0.2 ns，频率传递稳定度达到1.1×10^-15/d。

Time and frequency transfer based on modified integer phase clock method

The integer phase clock method is one of the most widely used integer ambiguity resolution method in precise point positioning (PPP). The stability of frequency transfer based on integer phase clock method is better than that of the conventional PPP. However, the clock offsets calculated by integer phase clock method contain the systematic biases, which affect the accuracy of time transfer. In this paper, we introduce the integer phase clock method, and analyze the origin of this systematic bias. Then based on single-difference ambiguity resolution method and atomic-clock refinement, a modified integer phase clock method is proposed. And some experiments are carried out to assess the modified integer phase clock method for ambiguity resolution and time-frequency transfer. The experiment results prove that the modified algorithm can eliminate the systematic bias effectively. The accuracy of time transfer can reach 0.1~0.2 ns, and the stability of frequency transfer can achieve 1.1×10^-15/d.