Time-Frequency Encyclopedia

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2024

Basic Configuration of the Timing System

Time‑transfer systems employ several specialized technologies and methodologies, including the geometric configuration used for positioning as well as the signal‑processing techniques employed by the receivers.

　　Time‑synchronization systems employ several specialized technologies and methodologies, including the geometric configuration used for positioning as well as the signal‑processing techniques employed by the receivers.

　　Different application methods may entail varying hardware and software requirements for user devices, as well as yield distinct system performance outcomes. User devices encompass a range of navigation receivers; system users employ these to receive navigation signals from multiple transmitting stations, thereby obtaining the navigation and positioning information they require.

　　When using this system, it is essential to account for the influence of the propagation environment. The propagation environment refers to the Earth’s surface and atmospheric conditions that radio navigation signals encounter as they travel from the transmitting station to the user’s receiver, including various natural and man-made sources of noise and interference. The timing system comprises three stations, with the transmitter serving as the critical component; it is among the most stable systems in the world today. Furthermore, the system employs a cesium frequency standard as the master clock for free‑running synchronization, while the subordinate stations operate in a master–slave synchronization mode. An automated station‑chain monitoring system has also been established, featuring a comprehensive diagnostic suite. Its equipment and performance offer advantages such as simplicity, high efficiency, robust reliability, and low operational and maintenance costs.

　　The solid-state transmitter used is domestically manufactured in China, with performance comparable to that of similar products worldwide. After the timing system completes its self‑check upon power-up and successfully receives satellite signals, it shall transmit timing requests at the prescribed service interval and, based on the information returned by the master control station, perform time corrections. Upon any change in the terminal’s time setting or location, the user terminal must notify the master control station of its current position. Current position information can be obtained either through a positioning request or via manual input.

Clock Source Selection for NTP Servers

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Clock Source Selection for NTP Servers

Time‑synchronization system frequency source specifications