Science | 3 minutes to read high-precision time synchronization

From the content of the previous issue, we know that Beijing Time, as our country's standard time, is created, maintained and broadcast by the National Timing Center of the Academy of Sciences.

The National Timing Center of the Academy of Sciences is located in Lintong, Xi 'an, Shaanxi, so Beijing time was born here, how to make people all over the country use Beijing time, and through what means to achieve synchronization with Beijing time? After reading this episode, I'm sure you'll find the answer.

Beijing time is transmitted and broadcast in the form of a special signal, which is called "timing". "Granting" means giving and handing over, and "giving time" means passing the national standard time to the user. For time users in the country, we have different requirements for time synchronization accuracy, and the means and methods used for timing are also different.

If you need seconds of time synchronization accuracy, Internet timing can meet your needs. For example, if your laptop is connected to the Internet, set up to automatically sync to the network time, then you can not worry about its time deviation will be greater than 1 second, because there are many sites that will provide network timing services to sync your computer time to less than 1 second standard time.

If you need time synchronization accuracy in the millisecond order, shortwave timing can be used, and the common user is the radio. If you are in the radio coverage of the low frequency time code, and you happen to have a radio clock, then congratulations, it can also guarantee your time synchronization accuracy in the order of milliseconds.

 GNSS Navigation Satellite System, a global satellite navigation system developed by， is also the third mature global satellite navigation system after GPS and GLONASS. The BDS Time benchmark is defined as GNSS Time (BDT).

At present, the GNSS-3 global satellite navigation system has been fully completed, and a total of 56 satellites have been launched, each satellite is equipped with a high-performance atomic clock combination. The atomic clock group of the ground main control station is composed of several domestic atomic clocks. The "paper time" is calculated by the main control station by collecting the data of the star clock monitored by the ground clock and the monitoring station and using the atomic time scale algorithm. The BDS time is realized by "paper time", and the signal source of the BDS time-frequency system is generated and maintained through the main clock of the master control station.

The BDS obtains the deviation between the system time and the international standard time UTC through the time comparison link established by the Punctuality laboratory of the National Timing Center, and controls the BDS time and UTC within a certain range as far as possible through the frequency control method.

The time deviation between BDT and UTC will be broadcast through the navigation message, and the user can obtain the deviation between local and standard time by solving the signal received by the satellite receiver, and then complete the timing by correcting the local deviation. At present, the accuracy of GNSS timing can reach 20 nanoseconds.

From the perspective of personal perception, millisecond accuracy is already the limit. But precise time is everywhere in our daily life, and in many cases we need more precise time.

In order to let you better feel the impact of high-precision time on our daily life, the following to tell you about the application of high-precision time synchronization in some daily fields.

In the field of financial securities, time synchronization is the basis of the cooperative operation of various systems. With the development of banking services, information systems have higher and higher requirements for time accuracy, and the time of WAN routers received by bank data center servers and network devices can no longer meet the needs of business processing. In order to meet the time and data consistency requirements of the bank information system and ensure the normal operation of the system, according to the management and business needs of the financial industry, the bank must build a set of high-precision clock server system to serve as the benchmark clock of the data center to time other devices.

In response to the increasingly accurate timing needs of institutional customers, institutional business servers and active production servers in the core computer room, the time synchronization scheme developed by Seth has both high reliability and security and excellent synchronous timing performance, which has been widely recognized by customers.

NS7200 and NS7210 self-developed universal high-performance NTP time servers can provide high-precision and high-reliability time signals and frequency signals, and have superior self-punctuality ability. They have passed the inspection of domestic authorities, and can meet the high-precision time demands of the financial industry.

Time synchronization system is an important part of smart grid, it is the whole smart grid clock synchronization pulsation. All device clocks and data timescales must be unified and synchronized to ensure that all data collected by each device at the same time must be stamped with the same time before being transmitted.

The use of GNSS and GPS timing system satellite synchronous clock technology in the power system can effectively reduce the workload of maintenance and operation personnel, so that the operation equipment inside the substation can get a unified and standard time benchmark, facilitate the operation of equipment, and improve the level of automation in the power system.

The TS3000 series of products independently developed by are specially used in time synchronization system timing devices, which are mainly used in the direction of power integrated automation, and provide a variety of types of time synchronization interfaces for a wide range of power plants, substations and dispa agencies.

TS3000 series power system master-slave time synchronization solution

The application of high precision time synchronization in intelligent system is mainly reflected in hospitals, schools, sports venues and so on.

The hospital clock system mainly provides unified and accurate time information for hospital staff, patients and patients' families, and provides standard time signals for the entire hospital computer system, call system, billing system, operating room control system and other weak current subsystems. The high precision clock system is the key index for the hospital to improve the quality and reliability of operation service.

The school clock system is essential to the daily operation of the school, the management of teaching, and the time scheduling of students and teachers. High-precision time synchronization is conducive to maintaining the accuracy and consistency of each clock in the school, maintaining the internal order of the school, improving teaching efficiency, and ensuring the effective implementation of school activities and security measures.

Stadium clock system is an indispensable part of sports events, it directly affects the fairness of the game, the experience of the audience and the normal progress of the whole event. High-precision time synchronization is able to provide a fair competitive environment for athletes, but also for spectators and event managers to provide accurate and reliable time benchmarks.

TS8000 is a high-precision clock product, which combines digital sub-clocks to form a sub-clock system. It can support IEEE1588v2 protocol, and is the first to use PTP to synchronize the time between the primary and secondary parent clocks in rail transit applications, improving the overall accuracy of the clock system. The products can be used in subway, tram, gymnasium, hospital, large railway station, airport and other places.

At present, intelligent system solutions have provided high-precision time synchronization for hundreds of hospitals in dozens of provinces and cities across the country; Provide high precision synchronous timing products and solutions for many schools and science academies, enjoy a good reputation; At the same time, it also participated in the construction of a number of sports venues, helping to hold the Winter Olympics, Asian Games and other events.

The solution of TS8000 series in intelligent system

Yes, high-precision time synchronization affects all aspects of our daily life, but also provides more accurate and efficient services for our lives.

In this era of the intelligent number of everything, Seth is just like the second hand moving on the clock face, working hard on the road of time-frequency innovation, constantly exploring a wider range of application fields, and contributing accurate time-frequency synchronization power to a more intelligent .