Ionospheric Spatial Gradient Monitoring by using a Long Baseline Monitor with Integrity Algorithms

Jeongrae Kim, Myeon-Sook Jeong, Jongsun Ahn, Young Jae Lee

Abstract:	Ionosphere storm increases ionospheric spatial gradient in short time and causes ionosphere delay difference between a ground-based augmentation system (GBAS) and a user aircraft. One of the ways of monitoring the ionospheric spatial gradient is the use of a long baseline monitor (LBM) that monitors the ionospheric delay at a remote location. Sudden increase of the ionospheric gradient may be caused by either ionosphere storm or receiver noise. Identifying the noise and the ionosphere storm is crucial factor for implementing the LBM. The integrity algorithms of a GBAS test-bed can be used to identify noisy measurements, and the integrity outputs can be used to isolate the ionospheric gradient peaks by the noise from the peaks by the storm. This study analyzed the feasibility of using the LBM for real-time monitoring of the ionospheric gradient by real data experiments. Data from two GPS receivers, separated by 20km, was processed by integrity modules. The ionosphere gradient anomaly was analyzed with integrity test results. After description of the experiment configurations, some considerations for the experiments, smoothing method, elevation angle threshold, maximum resolution, etc. are discussed.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	2938 - 2944
Cite this article:	Kim, Jeongrae, Jeong, Myeon-Sook, Ahn, Jongsun, Lee, Young Jae, "Ionospheric Spatial Gradient Monitoring by using a Long Baseline Monitor with Integrity Algorithms," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 2938-2944.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In