A lower troposphere Radar: 1.3-GHz active phased-array type wind profiler with RASS
A lower troposphere Radar: 1.3-GHz active phased-array type wind profiler with RASS
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DOI：
10.2151/jmsj.2004.915
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发表时间：
2004-06
影响因子：
3.1
通讯作者：
H. Hashiguchi;S. Fukao;Y. Moritani;T. Wakayama;Shin-Ichiro Watanabe
中科院分区：
文献类型：
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作者：
H. Hashiguchi;S. Fukao;Y. Moritani;T. Wakayama;Shin-Ichiro Watanabe
我们在以前主要用于观测大气边界层的1357.5兆赫边界层雷达的基础上，开发了用于低对流层观测的大气雷达(风廓线)(对流层低雷达)。由于新研制的大型有源相控阵天线、输出功率更高的有源发射模块和脉冲压缩技术，该雷达的系统增益得到了提高。它具有以下功能：4m×4m有源相控阵天线具有96个天线子元，获得33dBI的天线增益；24个有源发射模块获得2kW的峰值输出功率；采用斯潘和Ghebrebrhan(1996c)提出的8位优化编码的脉冲压缩技术，使最大S/N提高8倍。LTR是第一个有源相控阵1.3 GHz频段风廓线雷达。通过电子方式将天顶角控制在45°以内，可以改变波束方向。以高时间分辨率和高分辨率实时获取对流层低层大气风，包括大气边界层。使用带有扬声器喇叭的无线电声学探测系统(RASS)技术也可以观测大气温度。我们利用MU(中高层大气)雷达、多普勒声雷达和无线电探空仪的同时观测结果，证实了LTR作为一种可靠的大气观测工具的潜力。
We have developed an atmospheric radar (wind profiler) for lower tropospheric observations (Lower Troposphere Radar: LTR), based on the 1357.5-MHz boundary layer radar (BLR), which we previously developed mainly for observations of the atmospheric boundary layer. System gain of this radar is improved due to newly developed large-sized active phased-array antenna, active transmitting modules with higher output power, and pulse compression technique. It has the following functions: an antenna gain of 33 dBi is obtained with a 4 m × 4 m active phased array antenna which has 96 antenna subelements, a peak output power of 2 kW is obtained by 24 active transmitting modules, and maximum S/N is improved 8 times by using a pulse compression technique which uses 8-bit optimized coding developed by Spano and Ghebrebrhan (1996c). The LTR is the first active phased-array 1.3 GHz-band wind profiler radar. It is possible to vary the beam direction by electronically steering the zenith angle within 45°. Atmospheric winds in the lower troposphere, including the atmospheric boundary layer, are obtained with high time and height resolutions in real time. Observations of atmospheric temperature are also possible using the radio acoustic sounding system (RASS) technique with speaker horns. We have confirmed LTR’s potential as a reliable tool for atmospheric observations, using simultaneous observation results with the MU (Middle and Upper atmosphere) radar, a Doppler sodar, and a radiosonde.