| Summary: | Nowadays, with the increasing cost of GPS equipment, permanent GPS tracking stations have been installed at strategic places almost all over the world. The permanent GPS tracking stations are set to operate 24 hours a day, all year round, and one of these is the Malaysia Active Satellites System (MASS). The MASS network is used in a variety of applications in Malaysia involving the determination of precise positions, unified datum, earth rotation parameters and coastal studies as well as in atmospheric (tropospheric and ionospheric) modeling. The ionospheric delay is a function of the Total Electron Content (TEC) along the signal path and the frequency of the propagate signals. This study describes the potential of building a calculation by Software using MATLAB in estimating the TEC values from GPS observations collected by MASS network.
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