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Performance Analysis of Multi-constellation WADGNSS : Multi-constellation WADGNSS 성능분석

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공과대학 기계항공공학부
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서울대학교 대학원
학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2014. 8. 기창돈.
Since GPS has been developed, there was a lot of research to improve the accuracy of GPS. Measures for improving GPS positioning performance of the DGPS, WADGPS been presented in the order, the world has been built or being built WADGPS currently such as WAAS in U.S., EGNOS in Europe. In addition, in each country to establish its own satellite navigation system, and research to incorporate country-specific satellite navigation system is underway. In this study, multi-constellation WADGNSS simulation was made of combining multi-constellation simulation and WADGPS simulation, and its performance was analyzed. multi-constellation WADGNSS performance analysis was conducted with respect to South Korea and its surrounding terrain. multi-constellation simulation consists of satellite navigation system which satellite passing over Korea. So, the U.S. GPS, the Russia GLONASS, Europe GALILEO, China BEIDOU, Japan QZSS were included in multi-constellation simulation. The U.S. GPS and Russia GLONASS system is full operation and satellite orbit and clock error data is being provided. Thus satellite orbit error and satellite clock error is generated using precision ephemeris and broadcast ephemeris data to accurate simulation. Because Galileo, QZSS and Beidou is not full operation, For all of the satellite position and satellite clock error information is not provided. Accordingly GALILEO, BEIDOU and QZSS simulation software generates virtual satellite position and satellite clock error utilizing the almanac data provided by official institutions.
When using multi-constellation in the positioning, user positioning accuracy is increased by increased visible satellites. Therefore, even in the case of multi-constellation WADGNSS can be expected that performance is increased due to increased visible satellites. But it is expected that performance of estimating error in the WADGNSS reference station is increased by increased visible satellites and thus also analyzed. As a result, when multi-constellation is applied to WADGNSS, which improves the accuracy of estimating GNSS error was confirmed.
The performance of the multi-constellation WADGNSS was analyzed by a combination of satellite navigation system. And increasing the number of satellite navigation system used in multi-constellation simulation, a noticeable improvement in performance was confirmed. Especially when used for both five satellite navigation systems, horizontal position error and vertical position error was to confirm that it was respect to about 50% and 60% lower.
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