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Position localization is essential for visually impaired individuals to live independently. Comparing with outdoor environment in which the global positioning system (GPS) can be utilized, indoor positioning is more difficult due to the absence of the GPS signal and complex or unfamiliar building structure. In this paper, a novel landmark-based assistive system is presented for indoor positioning...
The impact of navigation satellite ephemeris error on satellite common-view time transfer was analyzed. The impact varies depending on the angle in view of a satellite relative to a user (elevation) and the baseline distance between 2 users. Some extents of the impact were figured out for several elevations and different baseline. As an example, results from several common-view time transfer links...
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