Setting Up an NTP Server at the Royal Observatory of Belgium; Conference paper

摘要

This paper describes the setup of an NTP server for time synchronization via the Internet at the Royal Observatory of Belgium. The time server is realized by a 'heartbeat' system of two PC servers connected to an NTS-3000 time server synchronized on three different sources: (1) UTC (ORB), our national time scale; (2) UTC broadcast by GPS satellite system; and (3) DCF- 77 System. The precision of the synchronization between our time server and the different time sources is a few microseconds. A remote synchronization on our server, using the NTP protocol, is directly traceable to UTC with an utmost precision of a few milliseconds when the synchronization is done under optimal conditions.