A Simplified Mode Conversion Program for VLF Propagation in the Earth-Ionosphere Waveguide.
NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF
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This report presents a variation of an earlier mode conversion program for numerically determining mode conversion coefficients and mode sums for a waveguide which is inhomogeneous along the direction of propagation invariance normal to the transmitter receiver line is assumed and reflections due to the horizontal inhomogeneity are neglected. Although somewhat more approximate than the earlier program the present version has the advantage of not requiring a full wave fields program for the height gain calculations and can be implemented with about the same ease as a WKB program. It has one advantage over the WKB formulation and that is that mode numbering along the horizontal inhomogeneity is immaterial. The mode conversion program will yield mode conversion coefficients and a mode sum plot for ground based vertical dipole excitation of the vertical electric field at the ground as a function of distance from the transmitter. Since the mode conversion coefficients are independent of transmitter terminator distance, allowance has also been made for incrementing the latter distance and plotting mode sums for the incremented distances.
- Computer Programming and Software
- Radiofrequency Wave Propagation
- Radio Communications