The effects of the backscattering enhancement on signals of rain radar

后向散射增强对雨雷达信号的影响

• 批准号: 11650434
• 负责人: ITO Shigeo
• 金额: $ 1.34万
• 依托单位: Toyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650434/
• 关键词: radar; backscattering; enhancement; rain; pulse wave; multiple scattering; パルス波

The backscattering enhancement in rain radar signals at millimeter waves was examined. This effect was difficult to observe with high resolution within a very small angle in the backward direction. Laboratory measurements of polarimetric radar parameters for large spherical scatterers were then performed at 30GHz to study the dependence on incidence polarization states. The measured linear and circular depolarization ratios were in good agreement with theoretical calculations, showing the cross-polar level of circular polarization due to multiple scattering is very large compared with that of linear polarization. The backscattered pulse wave using the 50GHz scatterometer was also analyzed to distinguish the multiple scattering process from the received pulse shape. The results indicated that the scattering process was confirmed to be separated with the time resolution of 3 nsec. In measuring the rain rate by the air-born radar, the echo from sea surfaces was included in radar signals. To evaluate this, the scattering.from scatterers near flat and rough boundaries was examined in laboratory experiments. The surface roughness of the boundaries was found to affect the received pulse shape, especially in the second order scattering between scatterers and rough boundary.

研究了毫米波雨雷达信号的后向散射增强。这种效应很难在向后方向的非常小的角度内以高分辨率观察到。然后在 30GHz 下对大型球形散射体的偏振雷达参数进行实验室测量，以研究对入射偏振态的依赖性。测量的线偏振和圆偏振比与理论计算吻合良好，表明与线偏振相比，由于多次散射而导致的圆偏振的交叉偏振水平非常大。还分析了使用 50GHz 散射仪的反向散射脉冲波，以区分多重散射过程和接收到的脉冲形状。结果表明，散射过程被证实是分离的，时间分辨率为3纳秒。在机载雷达测量降雨率时，来自海面的回波包含在雷达信号中。为了评估这一点，在实验室实验中检查了平坦和粗糙边界附近的散射体的散射。研究发现边界的表面粗糙度会影响接收到的脉冲形状，特别是在散射体和粗糙边界之间的二阶散射中。

项目成果

秋葉 誠: "赤外空間通信における降雨時の伝搬特性2"2002年電子情報通信学会総合大会論文集. (未定). (2002)

Makoto Akiba：“红外空间通信中降雨期间的传播特性 2”2002 年 IEICE 大会记录（待定）。

T. Tazaki: "Laboratory measurements of polarimetric radar signature of randomly distributed spherical and spheroidal scatterers at 30GHz"IEE Proc.-Microwave Antennas Propagation. Vol. 147, No. 1. 8-12 (2000)

T. Tazaki：“30GHz 下随机分布的球形和球状散射体的极化雷达特征的实验室测量”IEE Proc.-微波天线传播。

T.Tazaki: "Laboratory measurements of polarimetric radar signature of randomly distributed spherical and spheroidal scatterers at 30GHz"IEE Proc.-Microwave Antennas Propagation. 147. 8-12 (2000)

T.Tazaki：“30GHz 下随机分布的球形和球状散射体的极化雷达特征的实验室测量”IEE Proc.-微波天线传播。

中山敏憲: "ミリ波狭ビームによる散乱実験-パルス応答"2001年電子情報通信学会総合大会論文集. B-1. 79 (2001)

Toshinori Nakayama：“使用毫米波窄光束的散射实验 - 脉冲响应”2001 年 IEICE 大会记录 B-1。

T. Tazaki, H. Tabuchi, K. Ikeda, T. Oguchi, and S. Ito: "Laboratory measurements of polarimetric radar signatures of randmly Distributed spherical and spheroidal scatterers at 30 GHz"IEE Microw. Antemmas Propag.. vol.147(出版予定). (2000)

T. Tazaki、H. Tabuchi、K. Ikeda、T. Oguchi 和 S. Ito：“30 GHz 下随机分布球形和球状散射体的极化雷达特征的实验室测量”IEE Microw Propag.. vol.147（ （待出版）。