| 摘要 |
<p>Broadcast signal c is transmitted from a broadcast transmitter 5 to an artificial satellite 1 for predetermined signal conversion therein, whereby broadcast signals a 1 to an are transmitted to the entire area of Japan. On-earth stations 6-1 to 6-n are installed for weather forecast data. These on-earth stations receive the broadcast signals a 1 to a n , respectively, transmitted from the artificial satellite 1, and transmit receiving state data b 1 to b n , respectively, based on receiving level data to the artificial satellite 1. The receiving state signals are changed with variations of their radio wave attenuation according to whether it is cloudy, the clouddensity, whether it rains or snows, etc. The receiving state data are collectively sent back to a weather forecast center 9. Weather forecast data e obtained by analysis in the weather forecast center 9 is transmitted to the artificial satellite 1, which in turn sends weather forecast data f back to the full area in Japan.</p> |
