PROPAGATION ROUTE CALCULATION DEVICE, PROPAGATION ROUTE CALCULATION METHOD, AND RECORDING MEDIUM

摘要

PPROBLEM TO BE SOLVED: To provide a propagation route calculation device for faithfully calculating a propagation route near the reflection point of an electric wave, and for shortening a calculation time. PSOLUTION: This propagation route calculation device is provided with an electron density calculation part 11 for calculating electron density in the current calculation point of the propagation route of an electric wave; a refractive index calculation part 12 for calculating a refractive index on the basis of the electron density calculated by the electron density calculation part; a zenithal angle calculation part 13 for calculating the zenithal angle of the propagation route of the electric wave in the current calculation point on the basis of the refractive index calculated by the refractive index calculation part; and a step calculation part 14 for calculating a step representing a distance or a propagation time from the current calculation point to the next calculation point, and changing so as to become smaller according as the zenithal angle calculated by the zenithal angle calculation part becomes larger, according to the zenithal angle calculated by the zenithal angle calculation part 13. PCOPYRIGHT: (C)2009,JPO&INPIT