| 摘要 |
PURPOSE: To make it possible to establish the direction of an antenna quickly by receiving the radio wave from a navigation satellite, and detecting the latitudes and the longitudes of two facing antennas based on the radio wave. CONSTITUTION: A computer receives the latitude, the longitude and the height data of own antenna on the earth from a GPS receiver and receives the latitude, the longitude and the height data of an opposite antenna at the same time. Then, the respective data inputted from the own antenna and the opposite antenna are converted into the rectangular coordinates. For example, the position of a relay vehicle is made to be a point A, and the position of a home office is made to be a point B. The polar coordinates of the points A and B are converted into the polar coordinates, respectively, and the distance between the point A and the point B is obtained. Then, the external shape surrounded by the latitude line and the longitude line of the point A and the latitude line and the longitude line of the point B is regarded as the retancle, and the distances (a), (b) and (c) of the sides of the rectangle are computed. An interior angleθof the rectangle is computed by a cosine theorem. Furthermore, interior anglesθA andθB are obtained. An azimuth angleαA when the point B is observed from the point A and an azimuth angleαB when the point A is observed from the point B are operated.
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