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Impact of Time-Correlation of Monitor Statistic on Continuity of Safety-Critical Operations

机译：监控器统计信息的时间相关性对安全关键操作连续性的影响

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摘要

Integrity monitors are an essential component of ensuring the quality of navigation measurements for safety-critical GNSS augmentation systems. The sensitivity of these monitors is closely related to requirements limiting monitor false alarms. This paper shows that the risk of false alarms interrupting safety critical operations (loss of continuity) is closely tied to monitor-noise correlation. Analysis shows that specific continuity risk may be as high as 50% for conventional monitor implementations, when time correlation is considered. This paper presents an alternate two-threshold monitor implementation, which features both a subcritical threshold and a critical threshold, only the latter of which triggers a loss of continuity. Using this two-threshold implementation, we introduce methods to compute specific continuity risk in the presence of time-correlated noise. Subsequently, through simulation, we quantify how specific continuity risk is influenced by varying levels of time-correlation, which may be present in the raw monitor data or introduced by smoothing.
机译：完整性监视器是确保对安全至关重要的GNSS增强系统的导航测量质量的重要组成部分。这些监视器的灵敏度与限制监视器错误警报的要求密切相关。本文表明，虚假警报中断安全关键操作的风险（连续性损失）与监控器噪声相关性密切相关。分析表明，考虑到时间相关性，常规监控器实施方案的特定连续性风险可能高达50％。本文提出了一种替代的两阈值监控器实现，它同时具有亚临界阈值和临界阈值，只有后者才触发连续性损失。使用这种两个阈值的实现，我们介绍了在存在时间相关噪声的情况下计算特定连续性风险的方法。随后，通过仿真，我们量化了特定的连续性风险如何受到变化的时间相关性水平的影响，这些时间相关性水平可能存在于原始监控数据中，也可能通过平滑引入。

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  • 来源
    《Navigation》 |2012年第4期|303-315|共13页
  • 作者

    JASON RIFE; PRATAP MISRA;

  • 作者单位

    Tufts University;

    Tufts University;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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