电离层对L波段空间目标ISAR成像影响的建模与仿真  

Modeling and simulation of ionospheric effects on L-band ISAR imaging of space objects

作　　者：唐辉[1] 胡卫东[1] 郁文贤[1] 

机构地区：[1]国防科技大学ATR重点实验室,湖南长沙410073

出　　处：《电波科学学报》2007年第1期143-147,共5页Chinese Journal of Radio Science

基　　金：国家高科技发展计划资助项目(No.2003AA134030)

摘　　要：利用地基雷达对空间目标(卫星和碎片)进行观测,在一定条件下,对目标进行ISAR成像是分析其特性的重要手段。由于目标都处于电离层中或其上,跨电离层传播的目标回波(频率低于2GHz)在幅度和相位上都将受到电离层的影响。通过建模与仿真对其进行定性和定量分析可以有效地解决这个问题。论文针对L波段ISAR,通过四个数学模型仿真了电离层引起的目标回波相位起伏、折射效应以及回波幅度闪烁对ISAR图像的影响。三个实例仿真结果表明,这些影响将导致ISAR图像在距离向上产生平移,在方位向上主瓣展宽和旁瓣增强。Observating space objects （satellites and ISAR imaging of space objects is an important means debris） with ground-based radar, to analyze their features in some cases. Because space objects exist in or above the ionosphere, amplitude and phase of the object echo, whose center frequency is below 2GHz, will be changed randomly due to ionosphere. Modeling and simulation of ionospheric effects on ISAR will effectively resolve this problem by qualitative and quantitative analysis. This paper gives four models to simulate effects of phase fluctuation, refraction and amplitude scintillation due to ionosphere on L-band ISAR. The simulation results of three cases indicate that these effects will result in range shift and azimuth distortion of ISAR image.

关 键 词：电离层 L波段 ISAR 建模 仿真 

分 类 号：P352.3[天文地球—空间物理学]