日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS27] 大気電気学:大気電気学研究の自然災害軽減への応用

2019年5月28日(火) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:芳原 容英(電気通信大学 大学院情報理工学研究科)、鴨川 仁(東京学芸大学教育学部物理学科)

[MIS27-P01] Design of C-band polarimetric phased array weather radar

★Invited Papers

*中村 賢人1菊池 博史2妻鹿 友昭1牛尾 知雄1 (1.首都大学東京、2.電気通信大学)

Most of the severe phenomena, such as a tornado, a downburst, and microburst, are caused by locally generated cumulonimbus cloud in a short time. In order to observe the evolution of the inner structure of the rain cloud that changes on a scale of several minutes, a weather radar with higher spatiotemporal resolution is needed.
A weather radar with polarimetric observations can provide multi-parameter measurements that reveal detailed microphysics of storms in addition to accurate precipitation estimation, and improve weather forecasts. As a next radar development project, we plan to develop a polarimetric weather phased array weather radar. It is expected that the future phased array radar will achieve a polarimetric capability. The transmitted frequency of the under consideration radar is C-band (5GHz).
It is capable of measuring the 3-D rainfall distribution in less than 1 min in a range of several hundred kilometers, respectively.However, it is difficult to maintain high accuracy of observation of polarimetric phased array weather radar because of the following topics.
1) the effect of deterioration of the antenna characteristics, which are formed by the digital beam forming, in oblique direction are deteriorated. 2) the performance of the cross polarization discrimination, which is performance to distinguish between horizontal waves and vertical waves, are reduced in oblique direction. These problems caused the ununiformity of the accuracy of rainfall estimates.In this paper, we proposed the design of C-band antenna elements and array antennas. We designed the three type of the antenna array, which are a planner, a cylinder, and a semi-spherical types. And also a numerical simulation was conducted to evaluate the accuracy of rainfall estimates using three different arrays.