Implementation method of high-precision time service timing system based on giga AFDX network

Abstract

The present invention provides an implementation method of high-precision time service timing system based on a giga-AFDX network. The method comprises the steps of: taking the sum of delay parametersas real delay of a RTC frame from a time service terminal to a time served terminal to compensate the clock of the time service through recording of dispatching delay of the RTC frame at a main clocksource device, forward delay of a path switch and technical delay received and processed from the clock device, adding a main timestamp value in the RTC frame extraction frame of time service received by the time served terminal to the calculated and obtained actual delay value transmitted by the RTC frame, and writing the main timestamp value and the actual delay value into a local clock timer,wherein the difference of the main clock timer and the slave clock timer value cannot exceed 100ns in an implementation mode, namely, the synchronous time service precision can reach submicrosecond precision. The implementation method of high-precision time service timing system based on the giga-AFDX network can change the forwarding output mode of the switch of the RTC system in the network system, can change the frame load content at the forwarding port and can recalculate CRC so as to achieve the high-precision performance.

Description

【Technical field】 [0001] The invention belongs to the technical field of airborne bus communication in an avionics system, in particular to a design method for maintaining time integrity and improving timing accuracy under a deterministic data exchange communication framework. 【Background technique】 [0002] With the rapid development of sensor technology in the field of avionics, the types and quantities of sensors integrated in the airborne aircraft system are increasing. System users do not have the characteristics of different sensor data transmission requirements, so avionics communication is required to be oriented to different safety criticality And real-time distributed communication requirements provide high-precision timing function to realize the cooperative work of each module. Traditional aviation airborne communication networks such as 100M AFDX and FC adopt a master-slave network timing mechanism. Although the master-slave network timing function has the inhe...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for realizing high-precision timing system based on Gigabit AFDX network, so as to solve the problem of using low-precision timing in the existing AFDX communication mechanism

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