Abstract Traditional Global Navigation Satellite System (GNSS) clock disciplining strategy has a phase accumulation error due to the clock drift control, which leads to the limitation of timing accuracy. This paper proposes a high-precision time-frequency taming system driven by GNSS receiver clock offset and clock drift information. The system leverages GNSS-measured clock offset and drift as the taming measurement input, and adjusts the voltage control value of the local Oven Controlled Crystal Oscillator (OCXO) through Proportional-Integral (PI) control algorithm to achieve accurate taming of the local OCXO. Tests demonstrate that the instantaneous frequency accuracy of the local OCXO is 5.43e-11, the phase accuracy of 1PPS (One Pulse Per Second) is 3.8e-10(ns), the 1-second stability of the output 10MHz clock frequency is 2e-11, the stability of 100 seconds is 6.0e-12, and the stability of 10000 seconds is 6.6e-14. This system offers a low-cost, high-precision time-frequency reference suitable for time-sensitive applications such as power-system data acquisition and coordinated remote-sensing observations.
Wang et al. (Tue,) studied this question.