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So far, cosmic ray air showers have been detected using scintillation counterarrays on the ground widely. And also air Cherenkov detection method, which islimited its observation period in moonless nights, has been adopted. Thedetection method of radio emission from cosmic ray air showers is not new, butrather old method. Radio emission from cosmic ray air showers has not beendetected with the method of self-trigger system. If the detection method ofradio emission were available, there is no limit of the observation likeCherenkov counter. The developments of high radio frequency (RF) technologymight make the detection of radio emission from extensive air showers possible.Antennas calibrated in laboratory are available. With those antennas, we candirectly obtain the absolute intensity of radio frequency from cosmic ray airshowers. Main issue to detect radio emission is that signal level is quite low.The thermal noise particularly causes background noise source. Those issues anddetection method are discussed. We also describe an antenna detection method togenerate self-trigger signal and a method to identify air shower events fromnatural and artificial noises.

Detection of extensive cosmic ray air showers by measuring radio emission