Development of a Tropospheric Delay Estimation Model Based on Observed Atmospheric Pressure and High-precision GNSS Data Processed ZWD Estimation Values; [실측 기압과 고정밀 GNSS 자료처리 ZWD 추정값을 기반으로 하는 대류권 지연 추정 모델 개발]

초록

This research represents a method that separates tropospheric delay into hydrostatic delay and wet delay, to derive a tropospheric model which can be utilized as a Tropospheric Delay Estimation Model. Hydrostatic delay can be calculated through various empirical models using only atmospheric pressure data. Thus, the KP (Korea Pressure) model, an atmospheric pressure estimation model, was developed based on the observed atmospheric pressure data from GNSS (Global Navigation Satellite System) stations in South Korea. Results show that the average RMSE (Root Mean Square Error) of the GPT (Global Pressure and Temperature) model, based on global data, and the KP model are 6.5 hPa and 4.8 hPa, respectively. This indicates that the KP model better reflects the observed pressure in South Korea. KZWD (Korea ZWD) model, a wet delay estimation model, was developed based on the ZWD (Zenith Wet Delay) calculated using the total tropospheric delay data. This data was computed from the observed atmospheric pressure and the GIPSY-OASIS, a high-precision GNSS data processing software. The average RMSE of the KZWD model, based on the calculated ZWD, was 5.5 cm. © 2023 Korean Society of Surveying. All rights reserved.

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