Tropospheric error modeling for high integrity airborne GNSS navigation

Proceedings of the 2012 IEEE/ION Position, Location and Navigation Symposium Pub Date : 2012-04-23 DOI:10.1109/PLANS.2012.6236877

G. McGraw

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引用次数: 11

Abstract

This paper surveys Global Navigation Satellite System (GNSS) tropospheric modeling techniques currently employed in Space Based Augmentation Systems (SBAS), Ground Based Augmentation Systems (GBAS), and in precise point positioning applications. A method for generating GBAS tropospheric corrections without the use of meteorological sensors is discussed using seasonal models like those used in SBAS. An approach on how residual tropospheric errors can be handled in high-accuracy/high-precision carrier phase differential position applications is described. Current approaches for over-bounding residual tropospheric errors in GBAS and SBAS applications ignore correlation of these errors between satellites. This is not an issue today as residual tropospheric errors can safely be assumed to be small compared to other residual error components. However, with improvements in these other measurement errors associated with GNSS modernization, this assumption may no longer be appropriate. The types of integrity monitoring envisioned by the GNSS Evolutionary Architecture Study (GEAS) may benefit from a reexamination of the treatment of tropospheric errors as described here.

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高完整性机载GNSS导航对流层误差建模

本文综述了目前在空间增强系统(SBAS)、地面增强系统(GBAS)和精确点定位应用中使用的全球导航卫星系统(GNSS)对流层建模技术。讨论了在不使用气象传感器的情况下，利用与SBAS类似的季节模式产生GBAS对流层改正的方法。描述了在高精度/高精度载波相位差定位应用中如何处理对流层残余误差的方法。目前用于GBAS和SBAS应用的对流层超界剩余误差的方法忽略了这些误差在卫星间的相关性。今天这不是一个问题，因为对流层的剩余误差可以安全地假定为与其他剩余误差分量相比较小。然而，随着与GNSS现代化相关的这些其他测量误差的改进，这种假设可能不再合适。GNSS演化架构研究(GEAS)设想的完整性监测类型可能受益于本文所述对流层误差处理的重新检查。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 2012 IEEE/ION Position, Location and Navigation Symposium

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