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Phoenix Landing Radar Heatshield Anomaly

机译：凤凰着陆雷达热屏异常

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摘要

This paper details a specific and unexpected problem faced by the Entry, Descent, and Landing team on the Phoenix Mars Mission that demonstrates two problems in mission architecture: 1) the difficulties inherent in adapting commercial-off-the-shelf technology to a system different from the product's intended scope; and 2) the design of test environments sufficiently flightlike as to reveal systemic problems in new architectures. Specifically, the interaction of the entry heat shield with the landing radar could not be tested in a flightlike manner; hence, detailed simulation of the landing radar was conducted with the expectation that the radar could lock on echoes from the heat shield and report an erroneous altitude, and that phenomenon could be handled with appropriate flight software. Surprisingly, it was discovered that the heat shield spoofed the radar's internal logic that was designed to prevent locking on ambiguous radar returns. Mitigating the unexpected problem proved to be much more challenging than the anticipated heatshield lock scenario, ultimately requiring last-minute changes to both the radar firmware and the flight software.
机译：本文详细介绍了凤凰号火星任务的进入，下降和着陆团队面临的一个特定且出乎意料的问题，该问题证明了任务体系结构中的两个问题：1）将现成的商用技术适应不同系统的固有困难来自产品的预期范围；和2）测试环境的设计要足够灵活，以揭示新架构中的系统性问题。具体而言，无法以类似飞行的方式测试进入防热罩与着陆雷达的相互作用。因此，对着陆雷达进行了详细的模拟，以期雷达可以锁定挡热板的回波并报告错误的高度，并且可以使用适当的飞行软件来处理这种现象。出乎意料的是，发现隔热罩欺骗了雷达的内部逻辑，该逻辑旨在防止锁定在模糊的雷达回波上。事实证明，减轻意外问题要比预期的隔热罩锁定方案更具挑战性，最终需要对雷达固件和飞行软件进行最新更改。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2011年第5期|p.772-777|共6页
  • 作者

    J. Eric Belz; Curtis Chen; Ben Cichy;

  • 作者单位

    Jet Propulsion Laboratory, California Institute ofTechnology, Pasadena, California 91109-8099;

    Jet Propulsion Laboratory, California Institute ofTechnology, Pasadena, California 91109-8099;

    Jet Propulsion Laboratory, California Institute ofTechnology, Pasadena, California 91109-8099;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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