Loran-C System Dynamic Model: Temporal Propagation Variation Study

摘要

The results of a theoretical study to determine the expected extent of temporal variations in the Loran-C System are presented. Graphs of secondary phase correction vs distance, parametric in vertical lapse factor, for six values of ground impedance and parametric in ground impedance, for three values of vertical lapse factor are included. Although the secondary phase correction is most sensitive to ground impedance, it is relatively time stable and the most important parameter of concern in temporal variations is the vertical lapse factor. The effect of the surface refractive index on the secondary phase correction is negligible except in so far as it is correlated with the vertical lapse factor. A flow diagram and description of a program suitable for use on a desk calculator to calculate the secondary phase correction is included. (Author)