Time synchronization method based on troposcatter channel

Abstract

The invention relates to a time synchronization method based on a troposcatter channel. The time synchronization method based on a troposcatter channel transmits a time comparison signal to the troposcatter channel, and includes the following steps: establishing a scatter link; sending a time comparison signal generated by a master station atomic clock to a pulse gate, obtaining a video signal bymultiplying a pulse signal which is obtained through processing by the pulse gate by a sine wave, and sending out the obtained video signal through a signal transmitter; sending a time comparison signal to the time interval counter from a slave station atomic clock, and starting timing by the time interval counter; after a signal receiver receives the time comparison signal of the master station,sending the time comparison signal to the time interval counter through a low noise amplifier, a band pass filter, an automatic gain control module and a broadband matching filter, and stopping timingand sending the counted value to a time synchronization data processing unit after the time interval counter receives the time comparison signal of the master station; and calculating the clock difference between the master station and the slave station by the time synchronization data processing unit, determining whether the two station is synchronous in time, and if not, then performing calibration. The time synchronization method based on a troposcatter channel has the characteristics of being autonomous, rapid and over-the-horizon.

Description

technical field [0001] The invention belongs to the technical field of time synchronization, in particular to a method for time synchronization of a distributed system. Background technique [0002] Time synchronization is the basis for the normal operation of distributed systems such as networked radar systems, multi-base radar systems, and power grid systems. The accuracy of time synchronization has an important impact on the performance of distributed systems. For the time synchronization requirements of distributed systems, it can be realized by transmitting time comparison signals (pulse per second (1PPS)) through channels such as satellites, microwaves, and optical fibers. [0003] Using satellite channels to transmit time comparison signals for distributed system time synchronization is the main time service method at present, and it is widely used, such as satellite two-way time comparison method, satellite common view method, etc. This method can achieve long-distan...

AI Technical Summary

Problems solved by technology

[0003] Using satellite channels to transmit time comparison signals for distributed system time synchronization is the main time service method at present, and it is widely used, such as satellite two-way time comparison method, satellite common view method, etc. This method can achieve long-distance and high precision However, since each station in the distributed system cannot independently control and use the satellite channel, and the satellite channel resources are limited, it is difficult to meet the autonomy requirements of the distributed system for time synchronization

[0004] The method of using microwave channel transmission time to compare the signal for time synchronization has the characteristics of large channel transmission capacity and high comparison accuracy, and is suitable for time synchronization requirements in short distances. However, this method is difficult to achieve time synchronization beyond the line of sight. Relaying stations can solve the problem of overcoming obstacles to a certain extent, but station deployment has high requirements on terrain conditions, and the timeliness cannot meet the requirements of distributed systems

[0005] The method of using fiber optic channel to transmit time comparison signals to achieve time synchronization is characterized by long distance, high precision, and large capacity, but it is only applicable to the situation where there are optical fiber access points around each site, and it is difficult to meet the fast time after the distributed system maneuvers. sync request

Images