Abstract: An artificial satellite receives a broadcast signal transmitted from a broadcast transmitter. The broadcast signal is relayed towards earth by the artificial satellite. On-earth stations receive the broadcast signal. The artificial satellite receives response signals, to the broadcast signal, from the on-earth stations, respectively. Each response signal includes at least position data of the respective on-earth station. The response signals from the on-earth stations are evaluated to generate both a local and wide-area weather forecast. The artificial satellite distributes the local and wide-area weather forecast towards the earth. Each response signal may also include an amount of attenuation caused between the artificial satellite and each on-earth station, respectively.

Abstract: Broadcast signal c is transmitted from a broadcast transmitter 5 to an artificial satellite 1 for predetermined signal conversion, whereby broadcast signals al to an are transmitted to all of Japan. On-earth stations 6-1 to 6-n are installed for weather forecast data. These on-earth stations receive the broadcast signals al to an, respectively, transmitted from the artificial satellite 1, and transmit receiving state data b1 to bn, 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, rainy, snowy, the cloud density, 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 all of Japan.

Abstract: A communication terminal which communicates with a communication device includes a position detecting section which detects a current position of the communication terminal, and a control section which automatically notifies the communication device of the current position obtained from the position detecting section, in response to an instruction from the communication device.

Abstract: A communication terminal which communicates with a communication device includes a position detecting section which detects a current position of the communication terminal, and a control section which automatically notifies the communication device of the current position obtained from the position detecting section, in response to an instruction from the communication device.

Abstract: Broadcast signal c is transmitted from a broadcast transmitter 5 to an artificial satellite 1 for predetermined signal conversion therein, whereby broadcast signals a1 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 a1 to an, respectively, transmitted from the artificial satellite 1, and transmit receiving state data b1 to bn, 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 cloud density, 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.