The solution of gps time synchronization server in the communication industry

The time synchronization server, as the name suggests, is a server that uses time correction / time synchronization. This server obtains time from satellites. Common satellites are GPS satellites and Beidou satellites. The time synchronization server can obtain time from GPS and Beidou. Information, output standard time information through the required physical interface, so as to achieve the purpose of time.
The performance of the clock when it is working is mainly determined by two aspects: its own performance and the quality of the external synchronization signal. After the devices form a network, digital synchronization must provide accurate timing for the network to ensure its normal operation. In on-site maintenance, there are also many problems caused by the clock synchronization of the base station, especially in handover, solving clock synchronization is also a key point of network operation and maintenance. SYN2151 type time synchronization server
At present, in many communication scenarios and positioning scenarios, the clock synchronization accuracy between different devices is required to be very high; otherwise, the utilization of the time slot is low, and a large system time error is introduced when calculating the flight distance of the wireless signal. The mutual interference between the signals of each device, etc. The speed of the wireless signal in the air is 300 meters per microsecond. In order to achieve positioning accuracy within 1 meter, the time error between the devices must be nanoseconds or less. The clock synchronization method used in the market is also generally the timing synchronization of base station broadcasting. Not only the cost is high and the accuracy does not meet the requirements.
In view of the above problems in the prior art, the object of the present invention is to provide a high-precision clock synchronization method between base stations. This method is simple and effective, and to the greatest extent eliminates the delay caused by different time transmissions of different base stations. Time error, to achieve high-precision nanosecond clock synchronization.
In the overall output application of the gps time synchronization server in the communications industry, considering the unified clock of network automation equipment in the communications industry, as well as the requirements of transmission equipment and speed, multi-channel 1000MNTP network output is selected as the main timing link; while other independent running The synchronization of the automation system is determined in the form of timings such as 485 and IRIG-B codes. It is compatible with the output of many popular timing protocols and meets the unified requirements of the multi-function time of the automated timing system.
This solution makes full use of the SYN2151 time synchronization serverThe GPS + Beidou satellite 1PPS second signal has good long-term stability, the constant temperature crystal oscillator has high-precision short-term stability, and the software phase-locked control algorithm is fast and stable. The clock accuracy of the phase-locked loop output composed of phase control and constant temperature crystal oscillator fully meets the protocol requirements. It is verified by experiments that the accuracy of the synchronization clock in this clock synchronization management scheme is better than that of the current communication network. This scheme can make the clock quickly enter synchronization, stable and reliable, and good quality, which is conducive to future network expansion.
The copyright of this article belongs to Xi'an Simultaneously. It respects the original creation. It is strictly forbidden to wash the manuscript. Unauthorized reprinting is prohibited. Copyright and infringement will be investigated!