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128 results on '"Jan, Shau-Shiun"'

14. UAV shipboard landing with RTK: carrier phase compensates for wind and wave motion

Author

Huang, Chiu-Jung and Jan, Shau-Shiun

Subjects
Drone aircraft, Business, Telecommunications industry
Abstract

Limited landing area as well as interference due to wind disturbance and wave motion make shipboard landings of unmanned aerial vehicles (UAVs) extremely difficult. Use of UAVs at sea can enhance the efficiency of intelligence gathering and surveillance and could also increase long-range air-strike capability. To successfully land aircraft in such a challenging environment requires a high-precision navigation system; this prototype applies RTK measurements., UAVs can perform functions such as surveying, imaging, detection, sensor work, rescue, and geographic information systems (G1S) data collection. The exploitation of UAVs with portable launching and recovery systems using [...]

Published
2014

19. Wind Tunnel Data Analysis and Drag Reduction Study of Cyclists

Author

Chen, Jia-Jun, primary, Miau, Jiun-Jih, additional, Chen, Yng-Ru, additional, Yuan, Wei-Chien, additional, Jan, Shau-Shiun, additional, Chen, Chia-Hsing, additional, Ku, Te-Hsing, additional, Hsu, Xiao-Yong, additional, Ciou, Yu-Sian, additional, Chen, Yun, additional, and Chen, Yi-Jane, additional

Published
2020
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20. Improving GPS-based landing system performance using an empirical barometric altimeter confidence bound

Author

Jan, Shau-Shiun, Gebre-Egziabher, Demoz, Walter, Todd, and Enge, Per

Subjects
Instrument landing systems -- Design and construction, Avionics -- Research, Global Positioning System -- Equipment and supplies, Global Positioning System -- Design and construction, GPS receiver, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper develops an empirical confidence bound for barometric altimeter altitude errors and shows how this bound may improve the performance of GPS-based approach and landing systems. This empirical bound is developed using historical meteorological data collected at a set of geographically diverse locations over a thirty year period. The confidence bound developed is shown to provide a Gaussian overbound on altimeter altitude errors in standard atmospheric conditions between a [10.sup.-5] and [10.sup.-6] confidence level. This confidence bound is integrated into the standard methodology for analyzing the performance of GPS-based landing systems and the results of a performance trade study using the confidence bound are presented. The results show that incorporating the empirical barometric altimeter confidence bound provides an increase in the coterminous United States (CONUS) service volume for lateral precision with vertical guidance (LPV) type approaches. While this increase is approximately 2% for an L1 single-frequency GPS user, it jumps to roughly 40% for an L5 single-frequency user.

Published
2008

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