Beidou satellite navigation system can provide high-precision positioning, high precision time service and short message communication technology. With the gradual improvement of its construction, Beidou time server has been widely applied in the fields of national defense, power, transportation, surveying and mapping.

NTP (Network Time Protocol) is a protocol for synchronizing time on a network computer. The exact time source is the guarantee of precise time. The exact time source usually refers to international standard time (UTC).The time access to UTC for NTP can be atomic clock, observatory, satellite, and also can be obtained from Internet.

The time of the server in the Beidou school is distributed according to the level of the NTP server. According to the distance from the external UTC source, all servers are divided into different layers. The top layer has external UTC access, while the 2 layer obtains the time from the 1 level, and the 3 layer obtains the time from the 2 level, and so on.However, the total number of layers should be controlled within 15, as the accuracy is decreasing from 0 to 15. The Stratum-0 clock is in the special position of R subnet, and is the reference time reference source.

The Beidou school server uses NTP protocol to communicate, and achieves ms level time synchronization accuracy.The NTP protocol adopts client / server working mode. When the Beidou school receives the Beidou signal or uses the built-in atomic clock as the time benchmark of the system, the client regularly visits the server according to the set time interval to get accurate time information and adjusts its own system clock to synchronize its own time.

In some applications, the North Dou time server is also used as a client to get high precision time from the previous time server and to give time to its own clients.Our commonly used network devices, including computers, servers, network cameras, hard drives, and so on, all support NTP protocol. They only need to open the NTP timing function in LAN, and simply point the equipment IP to the server of Beidou school.

The monitoring software for the Beidou school server needs to be explained here. If a manufacturer promises you that the software matching them can monitor the synchronization and time deviation of all the clients, it can support at least 1000 NTP servers to monitor not less than 10000 customer terminal monitoring.Please note that the NTP development kit one hundred percent, which you consulted, is not the latest version, because only the old version can send an instruction to monitor the situation of all the clients. This is also the most serious vulnerability and bug is vulnerable to hacker attacks.Please pay attention to the latest version. For security reasons, only computers and matching sub clock can monitor synchronous timing status and time deviation with software.

As the world's leading Beidou time server manufacturer, Xi'an has been focusing on the time and frequency for 8 years. The core engineer has 10 years of experience.At present, the company has more than 20 software and hardware engineers, and technical exchanges and cooperation with western, western, Jiaotong University and other universities.The technical experience accumulated by various products has been very mature. The testing equipment of thousands of Metrology and testing units across the country are all synchronized in Xi'an, which means that we have conquered the most difficult core technologies related to time and frequency from the source, not to mention the realization of the server of the Beidou school server without too many technical difficulties.

On the other hand, the synchronous production department of Xi'an has automatic production line, automatic placement machine, reflow welding machine and high precision wire stamp pad.The test department has a series of supporting equipment for each link, including high and low temperature test box, light intensity meter, oscilloscope, time synthetic parameter tester, cesium clock, rubidium atomic frequency standard, counter and so on.

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