Before the Spring Festival of 2020, at the invitation of Xi'an Jiaotong University stomatological hospital, our company sent engineers to the hospital for confirmation, such as laser treatment apparatus, blood glucose meter, diabetes treatment apparatus, vision improvement equipment, sleep improvement equipment, oral health and health products, family emergency treatment products, etc. all need unified time. The time requirement is also higher and higher, so the Beidou satellite timing system is particularly important.

The Beidou satellite timing system, as the name implies, obtains time from the Beidou satellite. After processing through the internal high-tech means, it outputs the NTP/SNTP protocol of the multi-channel network, the 1-4 serial port time information and latitude and longitude position information from the back of the device, of which 1 of the network ports can transmit time to different physically isolated LAN through NTP/SNTP protocol at the same time, and it can also be carried out at the same time. There is no interaction between network segments, but also redundant backup. Each serial port has standard GPS time information, and the output way is standard GPS statement and latitude and longitude position information.

Beidou time service module

The components of the Beidou satellite timing system include antenna, antenna mounting bracket, main engine and connecting line.

Antenna: antenna, also called timing antenna, satellite antenna and so on, is used to obtain the standard time signal of the satellite, and is transmitted to the host through the cable medium. Under normal circumstances, the transmission distance is limited, the standard is 30 meters, and if it takes longer, signal amplification processing is needed.

Host: the Beidou receiver is contained in the host computer, and the standard clock information is obtained through the antenna on the Beidou satellite. Through the high resolution processing of the chip and the motherboard, the physical interface of the host's NTP interface and serial port +pps interface is processed.

The Beidou satellite is a global satellite navigation system developed by ourselves. The Beidou satellite navigation system consists of three parts: the space segment, the ground control section and the user segment. It can provide all kinds of users with high precision, high reliability location, navigation and time service all over the world, and has short message communication capability. The accuracy is 10m, the speed accuracy is 0.2m/s, and the timing accuracy is better than 50ns.

The hospital uses the SYN2151 type time synchronization server to set up the internal standard clock server in the hospital, and the equipment adopts "one main and one standby". When receiving satellite signal is normal, the time information of the whole clock system has no accumulation error. Moreover, since the self timer module inside the clock is always in the tame state of the dynamic timing signal, the time information in the initial period of operation is no error.Only when there is a long time of self preservation, can the system accumulate a little error, and this accumulated error can be eliminated instantaneously at the time of obtaining synchronization again. Thus, the time consistency and accuracy of the whole clock system can be guaranteed in a long-term and reliable manner.

Medical undertakings are the basic guarantee for the development of a country's livelihood. The orderly operation of hospitals is an important guarantee for the state, society and people. With the development of modern science and technology, more medical electronic devices, hospital management computers, and departments' information coordination equipment have made it important to produce an orderly whole operation system.

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