GPS 가강수량 산출을 위한 최소 관측세션 지속시간에 대한 분석
An Analysis of the Least Observing-Session Duration of GPS for the Retrieval of Precipitable Water Vapor
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초록
This study investigated the performances of precipitable water vapor (PWV)retrieval from the sets of ground global positioning system (GPS) signals, each of which haddifferent length of observing-session duration, for the purpose of obtaining as short sessionduration as possible that is required at the least for appropriate retrieval of the PWV for meteorologicalusage. The shorter duration is highly desirable to make the most use of the GPSinstrument on board the mobile observation vehicle making measurements place by place. First, using Bernese 5.0 software the PWV retrieval was conducted with the data sets of GPSsignals archived continuously in 30 seconds interval during 2-month period of January andFebruary, 2012 at Bukgangneung site. Each of the PWVs produced independently using differentsession durations was compared to that of radio-sonde launched at the same GPS location,a Bukgangneung site. Second, the same procedure was done using the data sets obtained fromthe mobile observation vehicle that was operating at Boseong area in Jeonnam province duringChangma observation campaign in 2013, and the results were compared to that at Bukgangneungsite. The results showed that as the observing-session duration increased the retrievalerrors decreased with the dramatic change happening between 3 and 4 hours of the duration. On average, the root mean square error (RMSE) of the retrieved PWV was around 1 mm forthe durations of greater than 4 hours. The results at both the Bukgangneung (fixed site) andBoseong (mobile vehicle) seemed to be fairly comparable with each other. From this study it isbelieved that at least 4 hours of observing-session duration is needed for the retrieval of PWVfrom the ground GPS for meteorological usage using Bernese 5.0 software.
Abstract
This study investigated the performances of precipitable water vapor (PWV)retrieval from the sets of ground global positioning system (GPS) signals, each of which haddifferent length of observing-session duration, for the purpose of obtaining as short sessionduration as possible that is required at the least for appropriate retrieval of the PWV for meteorologicalusage. The shorter duration is highly desirable to make the most use of the GPSinstrument on board the mobile observation vehicle making measurements place by place. First, using Bernese 5.0 software the PWV retrieval was conducted with the data sets of GPSsignals archived continuously in 30 seconds interval during 2-month period of January andFebruary, 2012 at Bukgangneung site. Each of the PWVs produced independently using differentsession durations was compared to that of radio-sonde launched at the same GPS location,a Bukgangneung site. Second, the same procedure was done using the data sets obtained fromthe mobile observation vehicle that was operating at Boseong area in Jeonnam province duringChangma observation campaign in 2013, and the results were compared to that at Bukgangneungsite. The results showed that as the observing-session duration increased the retrievalerrors decreased with the dramatic change happening between 3 and 4 hours of the duration. On average, the root mean square error (RMSE) of the retrieved PWV was around 1 mm forthe durations of greater than 4 hours. The results at both the Bukgangneung (fixed site) andBoseong (mobile vehicle) seemed to be fairly comparable with each other. From this study it isbelieved that at least 4 hours of observing-session duration is needed for the retrieval of PWVfrom the ground GPS for meteorological usage using Bernese 5.0 software.
참고문헌 (29)
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