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Impact of Multi-GNSS Measurements on Baseline Processing for Control Surveying Applications
Komal Narayan Pawar,윤성현,이흥규,Dinh Huy Nguyen 사단법인 항법시스템학회 2021 Journal of Positioning, Navigation, and Timing Vol.10 No.2
A series of experiments have been carried out by using National Geographic Information Institute(NGII) 's Continuously Operating Reference Station (CORS) data with various strategies to analyze the impact of multi-GNSS measurements on baseline processing. The results of baseline processing were compared in terms of ambiguity fixing rate, precision, and hypothesis tests were conducted to confirm the statistical difference. The combination of multi-GNSS measurements has helped to improve ambiguity fixing rate, especially under harsh positioning environments. Combination of GPS, Galileo, BeiDou could get better precision than that of GPS, GLONASS, Galileo, and adding QZSS made the baseline solution's vertical component more precisely. The hypothesis tests have statistically confirmed that the inclusion of the multi-GNSS in the baseline processing enables not only to reduce field observation time length but also to enhance the solution's precision. However, it is of interest to notice that results of the baseline solution are dependent upon the software used. Hence, comprehensive studies should be performed shortly to derive the best practice to select the appropriate software.
Characteristics of PM<SUB>10</SUB> and PM<SUB>2.5</SUB> in Saemangeum Reclaimed Land, South Korea
Mijung Song,Sangmin Oh,Komal Narayan Pawar,Rani Jeong 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
The Clean Air Policy Support System (CAPSS) for the year of 2017 showed that fugitive dust is a main contributor of the total PM10 and PM2.5 emissions in Jeollabuk-do. Recently, there have been reports that fugitive dust from the Saemangeum reclaimed land is affecting even the downtown area. In order to characterize the chemical compositions of PM10 and PM2.5 in Saemangeum reclaimed land, we collected PM10 and PM2.5 filter samples from May 2020 to June 2021, and then analyzed the chemical compositions of water-soluble ions and elements in the PM10 and PM2.5. The results in Saemangeum reclaimed land will be presented.