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http://dx.doi.org/10.5139/JKSAS.2008.36.1.039

Development and performance evaluation of GPS/PL simulator for UAV landing  

Lee, Geon-Woo (충남대학교 전기정보통신공학부)
Kim, Yong-Hyun (충남대학교 전기정보통신공학부)
Choi, Jin-Gyu (한국 해양 연구원)
Park, Chan-Sik (충북대학교 전기전자컴퓨터공학부)
Lee, Sang-Jeong (충남대학교 전기정보통신공학부)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.36, no.1, 2008 , pp. 39-47 More about this Journal
Abstract
Automatic landing performance of UAV can be enhanced by adding Pseudolite(PL) to GPS. However, it is very hard to install and operate PL with confidence because GPS satellites are moving and the landing zone are usually changeable. The coverage and accuracy of combined GPS and PL can be estimated by using simulator and the correct information is very crucial to UAV operation. In this paper, design, implementation and evaluation of GPS/PL simulator for UAV landing are given. A very realistic coverage estimation is obtained using GIS data and ray launching method with considerations of the transmitter power level, altitude of UAV, number and location of PL. The expected accuracy is estimated using DOP and NSP computed using both GPS and PL. The performance of simulator is evaluated by comparing with the results of a real GPS receiver, and the certified simulator shows the required accuracy for UAV landing can be easily met by proper installation of at least 2 PLs.
Keywords
GPS; Pseudolite; UAV; DOP(Dilution of Precision); NSP(Navigation System Precision);
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