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首页> 外文会议>Proceedings of the national technical meeting : "Vision 2010: Present and future" >The Effects of Local Ionospheric Decorrelation on LAAS: Theory and Experimental Results
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The Effects of Local Ionospheric Decorrelation on LAAS: Theory and Experimental Results

机译：局部电离层去相关对LAAS的影响：理论和实验结果

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Solar cycle 23 is expected to reach a maximum in the year 2000. This has produced a recent flurry of research about the possible adverse effects of the ionosphere on the millions of GPS users. The introduction of the Global Positioning System (GPS) ushered in a new era of affordable precise navigation. Differential GPS (DGPS) corrections have reduced positioning errors from about 100 meters to roughly 1 meter, which has led to their proposed use in aircraft precision approach. However, the accuracy of differential corrections is somewhat limited by spatial and temporal decorrelation of the atmosphere. Much of the recent increase in GPS usage, as well as the development of precision landing requirements were developed near solar minimum. Although consideration was made for increased levels of sunspot and ionospheric activity, it is prudent to better characterize ionospheric decorrelation. This paper will present both theoretical and experimental results in this regard.rnCurrently assumed value of spatial decorrelation for the ionosphere is about 2 mm/km, which is equivalent to an error of only 3 centimeters error due to the ionosphere at 15 kilometers from the DGPS reference station. However, this value is based on relatively smooth models of the ionosphere. This value seems overly optimistic when compared to a documented ionospheric gradient of 55 mm/km, which is certainly too conservative.rnMuch of the development of the prototype landing systems has occurred in the last three or four years, close to the solar minimum. Current requirements for precision landing, which limit integrity risk to one undetected navigation hazard in a billion trials, suggest that we must fully characterize ionospheric decorrelation. This paper seeks to obtain statistical bounds for the ionospheric decorrelation effects on a LAAS architecture.rnArchived data from the National Satellite Test Bed (NSTB = WAAS Prototype) was analyzed to characterize the spatial gradients. The impact of filter time constants on pseu-dorange error was calculated. This delay artifact of the CSC architecture was examined to ensure integrity.rnThis paper seeks to obtain statistical bounds for the ionospheric decorrelation effects on a LAAS architecture.
机译：预计太阳周期23将在2000年达到最大。这引起了关于电离层对数百万GPS用户可能产生的不利影响的最新研究。全球定位系统（GPS）的引入开创了负担得起的精确导航的新时代。差分GPS（DGPS）校正已将定位误差从大约100米减小到大约1米，这导致了它们在飞机精度方法中的拟议使用。但是，差分校正的精度在一定程度上受到大气的空间和时间去相关的限制。 GPS使用率的近期增长以及精确着陆要求的发展大部分是在日照最小的情况下进行的。尽管已考虑增加黑子和电离层活动的水平，但谨慎地更好地表征电离层去相关。本文将在这方面给出理论和实验结果。rn目前，电离层空间去相关的假定值约为2 mm / km，这相当于距DGPS 15公里的电离层造成的仅3厘米的误差参考站。但是，该值基于电离层的相对平滑模型。与记录的电离层坡度55 mm / km相比，该值似乎过于乐观，这肯定太保守了。原型着陆系统的大部分开发工作都发生在最近三到四年，接近日照最小值。当前对精确着陆的要求将完整性风险限制在一个十亿次试验中未发现的导航危险中，这表明我们必须充分表征电离层的去相关性。本文寻求获得电离层去相关效应对LAAS体系结构的统计界限。分析了来自国家卫星试验台（NSTB = WAAS原型）的存档数据，以表征空间梯度。计算了滤波器时间常数对伪误差的影响。对CSC体系结构的这种延迟伪影进行了检查，以确保完整性。本文旨在获取电离层去相关对LAAS体系结构影响的统计界限。

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