| 摘要 |
<p>[PROBLEMS] To extract noises on a high-frequency radio wave with a predetermined frequency, observe the state of the noises from the number of generation of the noises, the generation time, the strength of the noises, or the like, and estimate an event that caused the noise generation. [MEANS FOR SOLVING PROBLEMS] An output signal (SHS) is secondarily amplified by a high-frequency amplifier (AMP3) and an output signal (SHR) is secondarily amplified by an AMP (4) for which a high-frequency side amplitude reducing means is taken. In this case, the AMP (4) has a small gain of a high-frequency region and its output (SHR-2) is reduced in amplitude. However, a high-frequency noise has a frequency even higher than that of a carrier wave (SH) and the amplitude of a noise (NzB) becomes even smaller. The other output signal (SHS) is directly amplified by the wideband amplifier (AMP3). The width of an SHS-2 and the width of the SHR-2 are equalized by an amplitude adjusting means throughout the whole region and then mutually added by a both signal addition amplifying means again so that the amplitude of the output signal (SHS) is equalized to the SHR-2 and a predetermined threshold is set to extract the noises.</p> |
