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The paper describes the designing of web based system for transmission of GPS measurements so that power system operator may monitor overhead conductor sag of power transmission line at substation in real time. The testing results of transmission of GPS measurements from 11KV power transmission line to substation have also been discussed in detail. Raw GPS measurements are not so accurate that these are usable for overhead conductor sag evaluation. The estimated GPS altitude measurements obtained using signal processing techniques such as Least Square Parameter Estimation(LSPE) and Haar Wavelet Transform (HWT) with LSPE are also presented in this paper.
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