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LORAN-C Positioning Errors Caused by Scattering from Wires Above the Earth

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2 Author(s)
Olsen, R.G. ; Department of Electrical Engineering, Washington State University, Pullman, WA 99164. (509) 335-4950 ; Aburwein, A.

In this paper, the scattering of a LORAN-C navigation signal by a powerline is calculated. The results of the derivation can be used to predict positioning errors for land-based applications of LORAN-C, such as vehicle-location schemes. The only assumptions are that the line spacing is small compared to its height and that the LORAN-C signal is narrow band, and not incident at a grazing angle. From this general result, a very simple theory for predicting positioning errors is derived which is valid for most parameters of interest. It is found that, when a LORAN-C receiver is located near a powerline, position errors of 1 km are possible. This value is in accord with published experimental results. Further, it is shown that position errors are significantly greater when the LORAN-C signal approaches the transmission line at a small angle.

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Electromagnetic Compatibility, IEEE Transactions on  (Volume:EMC-24 ,  Issue: 4 )