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On the use of a failure emulator mechanism at nanosatellite subsystems integration tests

机译：关于纳米卫星子系统集成试验的故障仿真机制的使用

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The increase number of CubeSat based space missions in the last decade shows the new possibilities for cheaper, faster but not so better projects. This lack of quality in a mission completeness point of view is associated to lack of good practices at developing, assembly and testing phases. Addressing such problem, this work presents a fault injection tool for nanosatellite robustness testing, named Failure Emulator Mechanism (FEM). The goal of the FEM is to emulate at the subsystems interface level faults that could be presented during the mission operation of the spacecraft. Working at the communication bus, the FEM is capable to intercept the exchanged messages between two subsystems under test and inject different faults: (i) time related faults, i.e. delay; (ii) value related faults, i.e. bitflip and; (iii) specific communication bus faults, i.e. a verbose subsystem. The FEM was developed to support the integration tests of the software-intensive NanoSatC-BR2 On Board Data Handling Software (OBSw) and its Payloads. The NanoSatC-BR2 is the second scientific nanosatellite developed jointly by the Brazilian National Institute for Space Researches (INPE) and Santa Maria Federal University (UFSM). As this spacecraft works with a full shared I2C communication bus, the FEM was implemented to support and work at this communication protocol and electric interface. The use of FEM has proved to be helpful along all phases of nanosatellite development. In the early phase, FEM supports robustness requirement validation by means models in the loop (MIL). In the nanosatellite integration phase, FEM supports robustness testing of the communicating subsystems under integration, configuring hardware in the loop (HIL). In this paper, we present the design, implementation and results of FEM as MIL tool for robustness requirement validation of OBSw and Langmuir Probe, a particular NanoSatC-BR2 Payload.
机译：在过去十年中，基于立方体的空间任务数量的增加显示了更便宜的新可能性，更快但不是那么更好的项目。在任务完整性的情况下，这种质量缺乏质量与开发，装配和测试阶段缺乏良好的做法有关。解决此类问题，这项工作提出了一种用于纳米卫星稳健性测试的故障注入工具，命名为故障仿真机构（FEM）。 FEM的目标是在子系统接口级别故障中仿真，可以在航天器的任务操作期间呈现。在通信总线工作，FEM能够在测试和注入不同故障的两个子系统之间拦截交换消息：（i）时间相关的故障，即延迟; （ii）值相关的故障，即BitFlip和; （iii）特定的通信总线故障，即详细子系统。开发了有限元素，以支持在数据处理软件（OBSW）上的软件密集型纳米载体-BR2的集成试验及其有效载荷。纳米山-BR2是由巴西国家空间研究所（INPE）和Santa Maria联邦大学（UFSM）联合开发的第二个科学纳米卫星。由于本航天器与完整的共享I2C通信总线合作，因此实施了FEM以支持和工作在此通信协议和电气接口。证明了有限元的使用沿纳米卫星发育的所有阶段有助于。在早期阶段，有限元素通过循环中的模型（MIL）支持鲁棒性要求验证。在纳米卫星集成阶段，有限元素支持在集成下的通信子系统的稳健性测试，配置循环中的硬件（HIL）。在本文中，我们介绍了FEM的设计，实施和结果作为摩尔工具，用于鲁棒性要求验证OBSW和Langmuir探针，特定的纳米液-BR2有效载荷。

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