Abstract
We collect data from some Garrmin hand held receivers and process them by two different methods i) correct ionospheric delay using IGS ionospheric grid and ii) estimate ionospheric zenith delay and gradient components. The processing results show that positioning accuracy is as higher as processing longer length data. With data length from 5 minutes to more than 300 minutes, the horizontal accuracy is 1.50 – 0.15m and vertical is 2.70 – 0.60m. Method ii) provides better accuracy than method i) about 0.2m and 0.8 m in horizontal and vertical components respectively.
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