| 摘要 |
PURPOSE:To obtain automatically information regarding rain fall with out requiring any special apparatus by detecting received intensity of an electric wave from a stationary satellite so as to obtain the informations regarding the rain fall. CONSTITUTION:A receiver 10 is equipped with a parabolic antenna 11 and a frequency converter 12, and output of the converter 12 is fed to a radiofrequency wattmeter 13 equipped with a bolometer. When the sky is clear, a value of received electric power measured by the wattmeter 13 is stored to a memory 22, as a standard value. At rain fall, an electric wave from a broadcasting satellite 1 reduces according to the precipitation amount. The received electric power, which reduces during the rain fall, is measured by the wattmeter 13 and compared to the standard value stored in the memory 22, by a comparison measures 21, to obtain the decrement amount caused by the rain fall. A calculation measures 23 of precipitation calculates intensity of rain fall and an accumulated precipitation, based on a decrement amount by rain fall obtained by the measures 21 and referring to a conversion table stored in a ROM 24. |
