Introduction to GPS Clock System The GPS clock system is mainly used for high-tech products for computer and control devices in power automation systems. GPS digital products acquire standard time signals from GPS satellites and pass these information through various interface types. It is transmitted to the equipment (computer, protection device, fault recorder, event sequence recording device, safety automatic device, remote RTU) that requires time information in the automation system, so that the time synchronization of the entire system can be achieved.
Working principle of GPS clock system The working principle of GPS synchronous clock is to tame the crystal oscillator through the signal of GPS or other satellite navigation system, thereby realizing high-precision frequency and time signal output. It is currently achieving nanosecond timing accuracy and stability in the order of 1E12. The most efficient way of frequency output. At the same time, based on the latest GPS high-precision positioning timing module developed by the basic timing application products. The time information format conforming to the specification can be output according to the user's requirements, and the synchronous timing service is completed.
High-precision time reference has become one of the basic guarantee platforms in the fields of communication, power, radio and television, security monitoring, and industrial control. The GPS synchronous clock provides high-precision, all-weather, all-weather navigation, positioning and timing services with excellent timing performance; high precision, low cost; safe and reliable; all weather; wide coverage.
The composition of the GPS clock device The GPS synchronous clock is an output device for high-precision time and frequency signals. It is mainly composed of GPS/GNSS receiver, which can be GPS/GLONASS/BD/GALILEO, etc.; high-precision OCXO or é“· clock; local synchronous calibration unit; measurement unit; error processing and control structure; input and output. At work, the signal is tamed by GPS or other satellite navigation system to achieve high-precision frequency and time signal output. It is the most effective way to achieve nanosecond timing accuracy and stability in the 1E12 frequency output.
The main features of the GPS device:
1. High-quality industrial-grade components, high-level electrical design, and high-density integrated circuit structure enable the device to have excellent electrical isolation and electromagnetic shielding performance. The whole machine has no adjustable components, which greatly improves the anti-jamming performance and reliability of the device. Guarantee.
2. The self-holding ability is strong, and the clock device is better than 7*10-9 (0.42μS/min) after receiving the satellite signal.
3. Support single GPS, single Beidou, single CDMA, dual GPS, double Beidou, dual CDMA, GPS/Beidou/CDMA dual system receiver configuration, realize multi-reference redundant timing, intelligently distinguish GPS signal, Beidou signal, CDMA signal, external The stability and pros and cons of the B code time reference signal and a variety of time reference configuration methods.
4. Perfect performance monitoring of Beidou and GPS signals, automatic or manual selection of the main satellite signal.
5. Support single-star timing mode, suitable for poor reception, with roof and window antennas to choose from.
6. With dual-core processor, high precision and fast synchronization.
7. The GPS (Beidou) receiving antenna mainly considers lightning protection design, stability design, anti-interference design, high signal receiving reliability, and is not subject to the geographical conditions and environment of the power plant/substation.
8. All output signals of the device are isolated and output, and the anti-interference ability is strong.
9. The GPS clock uses a high-performance, wide-range switching power supply for stable operation.
10. The chassis is anti-magnetic and has strong anti-interference ability.
11. The device has self-reset capability, and can automatically resume normal operation when the device program is faulty due to interference.
12. Time reference source dual-system hot backup, constant temperature crystal oscillator self-defense. (optional).
13. Support dual power redundancy backup (optional).
14. The device has power interruption, GPS (Beidou) out of step (loss of lock) alarm multi-channel alarm (relay dry contact) signal output, online monitoring device operation status.
15. There are a variety of work status indicators to facilitate the daily inspection of the on-duty personnel.
16. The device adopts full modular plug-and-play structure design, supports hot swapping of boards, flexible configuration and convenient maintenance, and provides convenience for adding or changing the timing signal interface during power plant/substation reconstruction and expansion in the future.
17. The device provides a programmable TTL pulse signal (1PPS/1PPM/1PPH) for the accuracy index test of the synchronous clock.
18. The device can display the number of valid satellites tracked through the digital tube, and display the satellite status of the satellite clock device online.SHENZHEN CHONDEKUAI TECHNOLOGY CO.LTD , https://www.szsiheyi.com