Abstract
The Communications Research Laboratory (CRL) has been developing new radar systems in cooperation with the National Institute of Polar Research (NIPR) to support research activities and transportation in Antarctica area. A UHF step frequency radar system to measure sea ice thickness and a short pulse C-band radar to detect hidden crevasse were developed. These radio wave systems must have high resolution at close range. They not only have to penetrate into snow and ice, but also have to receive echoes which indicate where exist
boundary layers between ice and water for a sea ice thickness measurement or between ice and air for a crevasse detection. The characteristics of the instru-ments and results of preliminary experiments to confirm the characteristics of the radars are shown.
