Development of a Ship-Borne Lower Troposphere Radar (SB-LTR)

我们在前期研制的L波段(1357.5兆赫)对流层低层雷达的基础上，研制了一台用于海上对流层低层观测的风廓线仪(船-蓝低对流层雷达)。通过使用4m x 4m大小的有源相控阵天线，通过电子方式将天顶角控制在45度以内，可以改变波束方向。24个有源发射模块获得了2kW的峰值输出功率。SB-LTR于2004年2月22日至3月22日被安装在日本JAMSTEC的海洋调查船Mirai上进行试验观测。部署了全球定位系统导航传感器和三轴角度传感器，以对风速剖面进行必要的调整。在观测期间，天线波束被引导到垂直和四个倾斜方向，天顶角为10度。存储了经过脉冲解码和128次相干积分后的时间序列数据。同时获得的横摇、纵摇、航向、航速等数据也被存储起来，以供离线分析。我们可以成功地观测到与Madden-Julian振荡通过有关的风的变化。

We have developed a wind profiler for lower tropospheric observations over the sea (Ship-Brone Lower Troposphere Radar : SB-LTR), besed on the L-band (1357.5 MHz) lower troposphere radar, which we previously developed. It is possible to vary the beam direction by electronically steering the zenith angle within 45 degrees, by using an active phased array antenna of 4m x 4m size. A peak output power of 2kW is obtained by 24 active transmitting modules. The SB-LTR was installed to the oceanographic research vessel MIRAI of JAMSTEC, Japan for test observations during February 22-March 22, 2004. A GPS navigational sensor and a three-axis angular sensor are deployed to provide necessary adjustments to wind profiles. During the observation, antenna beams were steered to vertical and four oblique directions with the zenith angle of 10 degrees. Time series data after conducting pulse-decoding and 128 coherent integrations were stored. The data such as roll, pitch, direction and speed of the ship simultaneously obtained were also stored for off-line analysis. We could successfully observed wind variations associated with the passage of the Madden-Julian oscillation.