Fast-Scanning Phased-Array Weather Radar With Angular Imaging Technique
Fast-Scanning Phased-Array Weather Radar With Angular Imaging Technique
复制标题
采用角度成像技术的快速扫描相控阵气象雷达
DOI：
--
复制
发表时间：
2018
影响因子：
8.2
通讯作者：
T. Iguchi
中科院分区：
文献类型：
--
作者：
Fumihiko Mizutani;T. Ushio;E. Yoshikawa;S. Shimamura;H. Kikuchi;M. Wada;S. Satoh;T. Iguchi
研制了一种具有快速扫描和宽仰角覆盖能力的相控阵天气雷达。PAWR通过向其有限数量的天线元件供电来发射仰角宽波束，并使用所有128个天线元件接收降水介质反射的信号，每个天线元件都连接到模数转换器（ADC）。在ADC采样之后，对接收到的信号应用波束形成的数字处理，以在多个角度上同时完成接收。因此，PAWR可以在360°的范围内以1°的方位角间隔和在30 s的短时间内从0°到90 °的约1°的仰角间隔以100 m的距离增量进行观测，直到60 km。由PAWR测量的反射率因子进行了比较，从并列的C波段雷达，并被发现有0.53 dB的偏差和3.68 dB的标准偏差，这表明足够的精度观测降水。此外，在对流性降水的抽样观测中，PAWR利用其30 s的快速扫描和宽高程覆盖，在降水到达地面前9 min探测到降水核心。因此，很明显，PAWR的快速扫描和宽海拔覆盖能力提供了更早的检测和更高的检测概率，这将能够更早和更准确地预警恶劣天气现象，并更好地减轻损害。
A phased-array weather radar (PAWR) with fast scanning and wide elevation coverage capabilities has been developed. The PAWR transmits elevationally broad beams by feeding power to a limited number of its antenna elements, and receives signals reflected by precipitation media using all 128 antenna elements, each of which is connected to an analog-to-digital converter (ADC). After ADC sampling, digital processing of beamforming is applied to the received signals to accomplish receptions simultaneously over multiple angles. The PAWR can, thereby, make observations at 100-m range increments out to 60 km at 1° azimuth angle intervals over a range of 360° and at about 1° elevation-angle intervals from 0°–90° within the short time of 30 s. Reflectivity factors measured by the PAWR were compared with those from a collocated C-band radar, and were found to have a bias of 0.53 dB and a standard deviation of 3.68 dB, which indicates sufficient accuracy for observing precipitation. Furthermore, in a sample observation of convective rain, the PAWR detected a precipitation core 9 min before it reached the ground by its 30-s fast scanning and wide elevation coverage. It, thereby, became evident that the fast scanning and wide elevation coverage capabilities of the PAWR give earlier detection and a higher detection probability, which will enable earlier and more accurate warnings of severe weather phenomena and a better potential of mitigating the damage.