Multi-dimensional Ionospheric Gradient Detection for GBAS

Jing Jing, Samer Khanafseh, Steven Langel, Fang-Cheng Chan and Boris Pervan

Abstract:	This paper describes new methods for the detection of multi-dimensional ionospheric gradients for Ground Based Augmentation Systems (GBAS). In particular, we provide a means to determine the reference antenna configuration that maximizes the detectable range of these gradients. Monitors exploiting carrier-phase measurements across spatially separated ground antennas have attracted great recent interest because of their high sensitivity to spatial ionospheric gradients. However, they cannot detect all ionospheric gradients due to the presence of integer ambiguities. These ambiguities cannot be resolved because the gradient magnitude is unknown a priori. Furthermore, the performance of such monitors is highly dependent on the reference antenna topology. In this work, we address both the topology and cycle resolution problems using the newly developed null space monitor concept.
Published in:	Proceedings of the 2013 International Technical Meeting of The Institute of Navigation January 29 - 27, 2013 Catamaran Resort Hotel San Diego, California
Pages:	121 - 128
Cite this article:	Jing, Jing, Khanafseh, Samer, Langel, Steven, Chan, Fang-Cheng, Pervan, Boris, "Multi-dimensional Ionospheric Gradient Detection for GBAS," Proceedings of the 2013 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2013, pp. 121-128.
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