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首页> 外文会议>Proceedings of the 22nd international technical meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2009) >Natural Signal Deformations Observed in New Satellites and their Impact on GBAS
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Natural Signal Deformations Observed in New Satellites and their Impact on GBAS

机译：新卫星观测到的自然信号变形及其对GBAS的影响

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摘要

The Honeywell GBAS ground system SLS 4000 implements a powerful signal deformation monitor.This monitor uses measurements from multiple correlators and has been described in previous ION papers.As real satellite data was analyzed for algorithm validation in support of the FAA system design approval process establishing the integrity compliance,it was discovered that some new satellites have larger natural signal deformations than previously anticipated and that the resulting correlator measurement biases can change over time.These natural deformations do not impact satellite functionality so these satellites meet all specified tolerances.The problem identified by the FAA and associated key technical advisers(KTAs)is that firstly, such deformation although small could impact the error budget on a decimeter scale and secondly,there is no guarantee that the biases stay bounded i.e.they may gradually wander off to unacceptable levels over time. This paper explains the properties of the observed biases i.e.the threat model and demonstrates how this issue was solved in SLS 4000.This includes the technical solution to this problem and the associated assumptions that are supported in the final Honeywell safety analysis.It also includes the natural bias characterization of the satellites in the current GPS constellation.
机译：霍尼韦尔GBAS地面系统SLS 4000配备了功能强大的信号变形监测器，该监测器使用了多个相关器的测量结果，并在之前的ION论文中进行了描述。完整性合规性发现，一些新卫星的自然信号变形比以前预期的要大，并且相关的测量误差会随时间变化。这些自然变形不会影响卫星的功能，因此这些卫星满足所有指定的容差。美国联邦航空局（FAA）和相关的关键技术顾问（KTA）认为，首先，这种变形虽然很小，但可能会影响分米尺度的误差预算；其次，无法保证偏差会一直存在，即随着时间的推移，偏差可能会逐渐漂移到不可接受的水平。本文解释了观察到的偏差的属性（即威胁模型），并演示了如何在SLS 4000中解决此问题。这包括对该问题的技术解决方案以及最终霍尼韦尔安全性分析所支持的相关假设。当前GPS星座图中卫星的自然偏差特性。

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