Weather influence on Loran-C Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d217qt18n

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  • The influence of weather on the long range radio navigation system Loran-C was investigated. The variables analyzed over a period of 255 days were: time differences (TDs), TD signal-to-noise ratios, TD standard deviations (measured at a fixed receiver location in Corvallis, Oregon), time interval numbers (TINOs) (measured at the transmitter locations), transmitter switching times from the U.S. West Coast Chain (9940), and weather data from the same geographical area over a period of 255 days. The TDs are time differences between a pulse transmitted by the master station and a pulse transmitted by one of the three secondary stations W, X and Y, called TDW, TDX and TDY. The raw TD data showed a 28 day periodicity, which was found to be due to the master transmitter switchings. Only TDY showed a strong diurnal component. The TD data were found to be significantly correlated with the TINO data, temperatures and, in the case of TDY, also with the α-factor (related to the vertical lapse rate of the refractive index n) and N Dry (the dry component of the refractive index n) in Winnemucca, Nevada. The diurnal variations of TDY could be partially explained by the diurnal variations of the α-factor. The Local Phase Adjustments introduced by the System Area Monitors were estimated. Using the (predicted) TINO, temperature, n and a values as control variates we were able to reduce the standard deviation of TDW by 12%, of TDX by 21%, and of TDY by 21%.
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