摘要
海上大气波导会显著改变雷达电磁波的传播性能,反应到雷达图像上表现为强烈的海杂波回波信息。为了探究大气波导的影响因素,采用改进的GIT模型仿真方法模拟出波导背景下不同风速对雷达后向散射系数的影响,并且利用谱估计技术计算出掠射角随距离的变化。通过仿真结果分析,风因子对雷达后向散射系数影响显著,仿真结果对进一步利用海杂波反演大气波导及提高舰载雷达探测性能具有重要指导意义。
The atmospheric duct on the sea has a significant influence on the propagation performance of radar electromag- netic wave. The strong sea clutter echoes are reacted in radar images. To explore the factors that impact atmospheric duct, the effect of the wind speed on the radar backscattering coefficient under the condition of the atmospheric duct is simulated with the modified GIT model, and the variation of the grazing angle with the distance is calculated by using the spectral esti- mation technique. The analysis of the simulation results indicates that the influence of wind factor on the radar backscattering coefficient is great. The simulation result plays a very important role in inverting the atmospheric duct by using sea clutters and improving the radar detecting performance.
出处
《现代电子技术》
2012年第6期93-95,共3页
Modern Electronics Technique
基金
国家"863"计划项目:大气波导实时探测技术研究(2008AA093001)
关键词
大气波导
海杂波
GIT模型
谱估计技术
风场
atmospheric duct
sea clutter
GIT model
spectral estimation technique
wind field
