Clock synchronization method of helicopter avionics system test network

Abstract

The invention belongs to the avionics system test technology, and relates to a clock synchronization method of helicopter avionics system test network. The clock synchronization method of helicopter avionics system test network includes the steps: 1) distributing clock synchronization reference information; 2) receiving the clock synchronization reference information by a computer, operating a real time operation system, of the local network; 3) comparing the time difference between the computer and the clock synchronization reference information, and if the time difference is less than the absolute error minimum accuracy time length, counting the clock updating cycle at the moment into a set of clock updating cycles satisfying the absolute accuracy requirement, and if not, omitting the clock updating cycle; 4) if all the clock updating cycles are travesed, entering the step 5, and if not, changing the clock updating cycle and returning to the step 1; and 5) successively taking the clock updating cycles satisfying the absolute accuracy requirement as the updating cycle of the clock synchronization equipment, and sending the clock synchronization reference information to each computer until the debugging relative error in the clock updating cycle is less than the relative error minimum accuracy time length.

Description

technical field [0001] The invention belongs to the test technology of avionics system. Background technique [0002] With the large-scale application of digital avionics systems for helicopters, the demand for time precision in the testing and simulation process is getting higher and higher. The avionics system / finished product itself works in the embedded real-time operating system environment, and the traditional test solution based on Windows non-real-time operating system cannot effectively solve the test problem of dynamic and static time characteristics of the measured data in milliseconds or even microseconds . Contents of the invention [0003] The purpose of the present invention: to propose a clock synchronization method for the test network of the helicopter avionics system, which can make the test network of the avionics system work under the same clock reference, and further realize the test of the dynamic and static time characteristics of the measured data...

AI Technical Summary

Problems solved by technology

The avionics system / finished product itself works in the embedded real-time operating system environment, and the traditional test solution based on Windows non-real-time operating system cannot effectively solve the test problem of dynamic and static time characteristics of the measured data in milliseconds or even microseconds

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