Time mark alignment method for redundancy system data acquisition

Abstract

The invention belongs to the technical field of aircraft engineering application and relates to a time mark alignment method for redundancy system data acquisition. The method comprises the followingsteps: a) sequentially connecting each acquisition card with a debugging interface of each redundancy VMC (Velocity Management Computer) or RN (Remote Node) target machine, as a data acquisition chain; b) setting a counter into a CPLD (Complex Programmable Logic Device) of each acquisition card, and by taking a counting value as a time maker, performing time sequence marking on an acquired targetmachine data packet; c) setting a 10MHz high-performance clock source in an FPGA (Field Programmable Gate Array) of a main control card, leading out through a hard wire, and synchronously driving allcounters in the step b); d) when real-time embedded software in the acquisition card receives target machine acquisition data each time, reading a time marking value generated in the step b), and transferring the time marking value and the acquisition data to a main control PC (Personal Computer); e) according to the time marking value, expanding and analyzing redundancy target machine data packets on a same time axis by analysis software of the main control PC according to the time marking value, thereby achieving the purpose of reducing real target machine time sequences.

Description

technical field [0001] The invention belongs to the technical field of aeronautical engineering applications, and relates to a time scale alignment method for data collection of a redundancy system. Background technique [0002] The WL-A aircraft management system adopts a redundancy architecture. After the aircraft management computer (hereinafter referred to as VMC) and the remote node (hereinafter referred to as RN) of each redundant channel collect data, they need to conduct analysis on the same time axis. Channel timescale alignment issues. If the heartbeat value of the VMC / RN target machine is directly used as the time scale for channel data alignment, when the VMC itself is already in an out-of-sync (non-synchronized) state, the data aligned on the time axis will not really occur simultaneously. It is impossible to restore the real timing of the system; the flight test interface (hereinafter referred to as FTI) of the current aircraft management system uses the time ...

AI Technical Summary

Problems solved by technology

If the heartbeat value of the VMC / RN target machine is directly used as the time scale for channel data alignment, when the VMC itself is already in an out-of-sync (non-synchronized) state, the data aligned on the time axis will not really occur simultaneously. It is impossible to restore the real timing of the system; the flight test interface (hereinafter referred to as FTI) of the current aircraft management system uses the time stamp of the main control PC to mark the data packets collected by each channel, but is subject to the non-real-time operation of the PC windows System, the timing mark operation is greatly affected by other processes, and the time stamp precision generated by the software is low (microsecond level), misalignment or missynchronization still occurs during actual use, which seriously affects the effect of data analysis

Images