The design of IMB bus data processing software

This paper introduces Intermodule Data Bus (IMB)which is used for the C919 Flight Control System. It is necessary to develop IMB bus data processing software to provide data basis for civil aircraft airworthiness certification test flight.IMB data are collected and recorded in INET-X protocol in test system, and its bus packet data are mixed with data from other systems on the aircraft.This way of storing multi-source network data poses a problem for efficiently identifying the IMB packets in the massive INET-X data file.The paper finds that STREAMID is the key data which can uniquely identify the IMB packet from the INET-X network data and LABEL of the message block which can ultimately locate the specific parameters of the IMB bus data by analyzing the INET-X network packet format, IMB bus packet format and network packet storage features.The paper designs a set of ICD management database suitable for data analysis and studies general flow of data processing.The algorithm of time-searching based on memory mapping is used to location of IMB data in Ethernet data packet.The paper also detailed introduces of the IMB packet localization algorithm. IMB data processing software is designed with these algorithms. It has high efficiency to meet the demand of IMB bus data processing in flight test after software test.