Radio wave arrival status estimating system, its method and program

摘要

A radio wave arrival status estimating system characterized by having an estimating means that estimates whether the physical characteristic of a radio wave received at the reception point of a radio system to be evaluated has reached the minimum allowable level for determining the characteristic of the radio system; that estimates an arrival status of the radio wave at the reception point by applying a first radio wave propagation status estimating technique to the reception point when estimating that the physical characteristic has reached the minimum allowable level; and that estimates an arrival status of the radio wave at the reception point by applying a second radio wave propagation status estimating technique to the reception point when estimating that the physical characteristic has not reached the minimum allowable level.

主权项

1. A radio wave arrival status estimating system, comprising:
a reception point of a radio system for receiving line of sight and reflected radio waves; a determining unit that, by a deterministic estimation technique, determines for each radio wave whether or not an intensity of the main path of the radio wave to be evaluated is larger than a pre-decided threshold, estimates that a propagation characteristic of the radio wave has reached a minimum allowable level when the intensity of said main path is smaller than said threshold, and estimates that it has not reached the minimum allowable level when the intensity of said main path is larger than said threshold, and an estimator that estimates an arrival status of the radio wave at said reception point by applying a first estimation technique of a radio wave propagation status for the reception point at which it is estimated that said minimum allowable level has been reached, and estimates an arrival status of the radio wave at said reception point by applying a second estimation technique of a radio wave propagation status, being a technique of which a precision is higher than that of said first estimation technique of the radio wave propagation status, for the reception point at which it is estimated that said minimum allowable level has not been reached; wherein said deterministic estimation technique is a ray tracing process that considers some but not all of reflection, transmission, diffraction, and irregular reflection of the radio wave in estimating the propagation characteristic of the radio wave, the propagation characteristic being associated with which of the reflection, the transmission, and the irregular reflection are considered by said deterministic estimation technique, wherein the ray tracing process is terminated when a propagation loss of the some but not all of the reflection, the transmission, the diffraction, and the reflection that are considered is less than wherein an allowable propagation loss of a radio system, and said propagation characteristic includes at least one of an intensity of the radio waves received at the reception point, existence or not of the line of sight radio wave, an intensity of a main path, an arrival angle, a radiation angle, and a delay spread.