Design and implementation of NTP wireless time server based on Wi-Fi

BAI Shan-shan^1,2,3, HU Yong-hui^1,2, XU Rui^1,2,3

1. National Time Service Centre, Chinese Academy of Sciences, Xi′an 710600, China;

2. Key Laboratory of Precision Navigation and Timing Technology, National Time Service Center,

Chinese Academy of Sciences, Xi′an 710600, China;

3. University of Chinese Academy of Sciences, Beijing 100039, China

Abstract：This paper presents a design of NTP wireless time server based on Wi-Fi for meeting the needs. In this time server, the GPS is adopted as time source, the data acquired by the GPS receiver is sent to the ARM controller, the time code information is acquired and processed by the ARM controller, and the time server is linked to the network layer via the Wi-Fi wireless transceiver module. The time server completes the time service with the NTP protocol, and the time service precision can reach 1 ms within the local network.

Key words：ARM controller; Wi-Fi; NTP; GPS receiver