宇宙機シミュレーションのための分散オブジェクト指向フレームワークの研究

概要

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We aim that a simulation framework of Spacecraft Simulation Environment (SSE) can be commonly applied not only to Full Software Simulations (FSS) but also to Processor-In-the-Loop Simulations (PILS) and to Hardware-In-the-Loop Simulations (HILS), while various spacecraft simulators are generally tailor-made at individual phases of development. Prior to the actual implementation of SSE, we designed the framework for FSS and PILS, and demonstrated its advantage to spacecraft simulations using an experimental system. In this study, we implemented an experimental system for PILS, and demonstrated feasibility of the framework using the system. Real-time tasks working on μITRON communicate with the rest of spacecraft simulator through Java-based middleware "Hirano's Object Request Broker (HORB)"[1] via distributed communication interfaces (I/Fs) written in Java. These I/Fs aredesigned to be commonly applied to both FSS and PILS. We also implemented a tool called "Java-μITRON Bridge GENerator (JBGEN)" to automatically generate Java-μITRON communication programs from the I/Fs. Furthermore, "MemorySaving" HORB is developed in order to avoid communication latency.
宇宙航空研究開発機構の論文