3:30 PM - 3:45 PM
[MTT46-12] Study on tropospheric delay variations extracted from a short baseline analysis and their application to meteorological observation
Keywords:GNSS, Tropospheric delay, Short baseline, Application to meteorological observation
A GBAS ground station typically has four GNSS stations with separation of several 100m each other. Electronic Navigation Research Institute (ENRI) participated in the safety assessment and validation activities, which were performed to validate draft international standards for high category GBAS. As one of the activities, ENRI developed a prototype system and installed it in New Ishigaki airport (24.40N, 124.25E). The system has the typical four GNSS stations within a horizontal scale of 400m and an additional GNSS station called as ionosphere field monitor (IFM), which is located as about 2km away from the four stations. These GNSS stations consists of dual frequency antenna and receiver and continuously collect GNSS data. Additionally, we set up a different GNSS receiver which can accept multi-RF signal inputs. Combining the receiver with Radio-over-Fiber (RoF) devices, we can use a common clock for signal processing two GNSS signals received at the both ends of the baseline with a length of 2.3km . This additional system enables us to examine a tropospheric difference for each GNSS satellite without correction of difference of receiver clock drift components between two received signals although it is required to distinguish tropospheric delay differences from ionospheric effects and multipath errors using dual frequency measurements and characteristics of multipath variations .
In this study, we mainly examine tropospheric delay difference data with the baseline length of 2.3km, including GNSS data collected from the prototype system. Considering geometry of GNSS satellite propagation paths and observational errors, we will discuss candidate meteorological phenomena and application to future meteorological observation.
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