The Beidou system provides reliable and accurate timing services for China, ensuring the normal operation of the national economy and people's livelihood. The timing system is an important means of achieving time-frequency unity, as well as a key system for high-precision navigation and positioning, and ensuring the normal operation of important areas of national economy and people's livelihood.
The timing system is responsible for broadcasting the standard time-frequency signal to the user, and the user calibrates the local time signal after receiving the standard signal. Time synchronization technology is an important means of achieving time-frequency synchronization between different platforms, systems, and user terminals. Even high-precision timekeeping clock sets can experience time drift due to environmental factors and aging, requiring regular or irregular comparisons with time-frequency reference laboratories such as China's National Time Service Center (NTSC) and the United States Bureau of Standards (NIST).
Important fields such as electricity, finance, and telecommunications, which are closely related to national security and people's interests, have high requirements for the synchronization of time systems. The use of GPS timing poses a safety hazard of being subject to human control. With the rapid development of the Beidou Satellite Navigation System (BDS) and Beidou timing technology, Beidou timing products are gradually replacing GPS products.
Timing technology mainly includes shortwave timing, longwave timing, network timing, and satellite timing.
Satellite navigation timing has the advantages of high accuracy, wide coverage, all day, all-weather, and low equipment cost, and is highly favored by various users. Long wave timing accuracy is in the microsecond range, and ground waves transmit wirelessly through the earth, resulting in stable signals and high reliability; Tianbo belongs to ionospheric reflection, which is greatly affected by weather and has low timing. The accuracy of shortwave timing is about 1-3 milliseconds, and skywave fluctuations are greatly affected by weather.
Low frequency time codes belong to long wave timing and have better stability compared to long wave skywaves. They are generally used for regional transmission. GPS、 Satellite systems such as Beidou use internal clocks and electromagnetic waves to transmit radiation from space, achieving global coverage, high timing accuracy, wide coverage, and easy use.
Multiple time servers in the network are equipped with atomic clocks or high-temperature crystal oscillators, and wired network transmission can also be achieved through NTP, PTP, and other methods. Fiber optic transmission belongs to a special type of network timing, which utilizes fiber optic networks for timing transmission based on optical signals. The timing accuracy can reach the nanosecond or even picosecond level, and it has the characteristics of high precision, low transmission loss, noise isolation, and wide distribution.
The accuracy of the Beidou timing module may vary in different situations. On a global scale, the timing accuracy of the Beidou system is better than 20 nanoseconds; In the Asia Pacific region, the timing accuracy is better than 10 nanoseconds.
For example, the SKG12DT timing module developed by Shenzhen Tiangong Measurement and Control Technology Co., Ltd. has a timing accuracy of 15ns RMS and is a high-performance GNSS function super integrated solution timing module with high sensitivity, ultra-low power consumption, and small size characteristics. The RF signal is input into the channel module through the antenna, and serial information such as position, velocity, and time is fully recorded through NMEA protocol or custom protocol.
In addition, the SKG121T high-precision timing module can achieve up to 5ns, featuring industrial grade, ultra sensitivity, ultra-low power consumption, and small size. Apply RF signals to the antenna input of the module and provide a complete serial data message of position, velocity, and time information using NMEA protocol or custom protocol at the serial interface.
In practical applications, the accuracy of the Beidou timing module may be affected by various factors, such as the receiving signal environment, equipment performance, etc. If there is a high requirement for timing accuracy, when choosing the Beidou timing module, attention can be paid to its specific technical parameters and performance indicators.
Copyrights© Shenzhen Skylab Co.,LTD All Rights Reserved.
