OBSUS：一种高效的机载软件更新系统仿真评价

摘要

Integrated modular avionics (IMA)is the main trend of avionics systems development in avionics industry.In IMA,more and more functional modules are implemented by the software to replace the corresponding functions of hardware,while the software system has the need of constant update,therefore the role of software update system appears to be particularly important.Centring on the key technology of software update in avionics system,in this paper we present a novel on-board software update system OBSUS through studying the on-board environment and its software update features.By designing OBSUS system architecture and implementing communication protocol Xmodem+, the OBSUS can be disposed on various hardware platforms to meet the requirement of software update in on-board environment,and has higher universality.At last,we implement a prototype system of OBSUS on real hardware platform,and make simulation study and evaluation on the performance of the system.Simulation verifying results show that OBSUS is an efficient on-board software update system.%航空电子产业中航电综合化是目前航电系统发展的主要趋势，在综合化航电系统中，越来越多的功能模块采用软件实现，来代替硬件的相应功能，同时软件系统是需要不断更新的，因此软件更新系统的作用显得尤为重要。围绕航电系统中的软件更新关键技术，通过研究机载环境及其软件更新的特点，提出一种新型机载软件更新系统OBSUS（On-Board Software Update System）。通过OBSUS系统架构设计，以及通信协议Xmodem＋的实现，使得OBSUS可部署在多种硬件平台中，以满足机载环境软件更新的要求，具有较强的普适性。最后，在真实硬件平台上实现了OBSUS原型系统，并对系统的性能进行了仿真研究与性能评价。仿真验证结果表明，OBSUS是一种高效的机载软件更新系统。