摘要
在传统降雨衰减及气象雷达方程基础上,针对降雨区域内的目标探测问题,分析降雨率、电波频率与雨体反射率之间的关系,提出了降雨衰减、雨体杂波和降雨天线噪声等综合因素下的机载雷达探测距离模型;仿真分析了预警雷达和火控雷达受降雨影响时,不同雷达反射截面积条件下低空目标的探测性能,结果表明,对于工作频率较高的雷达,雨衰减会极大地缩短雷达探测距离,增加天线噪声和杂波能量,降低雷达目标信噪比,导致雷达性能急剧恶化。
Based on the modern rain attenuation model and weather radar equation,the relationship among rainfall rate,radio frequency and rain volume reflectivity was analyzed.The airborne radar detection range model under the integrated factors including rain attenuation,rain clutter and antenna noise was presented for target detection in rainfall area.The performance of airborne early warning radar and fire control radar for low-altitude target detection with different reflected target cross section was simulated.The result showed that the radar operated at high frequency band was seriously influenced by the integrated factors since the rain attenuation may cut down the radar detection range,enhance the antenna noise and clutter energy and decrease the radar target SNR.
出处
《电光与控制》
北大核心
2011年第11期36-39,61,共5页
Electronics Optics & Control
基金
航空科学基金(20095184005)
泰山学者建设工程专项经费资助
关键词
机载雷达
电波传播
雨衰减
雨杂波
雷达作用距离
airborne radar
radio propagation
rain attenuation
rain clutter
radar detection range
