曲线合成孔径雷达信号模型与孔径形状研究

Study on aperture shape in curvilinear synthetic aperture radar

基于曲线合成孔径雷达原理与空间几何关系,讨论了曲线合成孔径雷达信号模型与成像方法,推导出目标的一维及二维信号模型,并将其扩展到三维空间。考虑到不同的曲线孔径形状将对方位分辨率和高度分辨率有不同影响,详细研究了各种不同形状的曲线孔径,给出了各自的优缺点和适用条件。结论是,上下、左右对称的孔径形状较不对称的效果更优,L型孔径将导致很高的旁瓣。仿真实验结果对真实飞行航迹具有指导作用。

Based on the theory and space geometry relation of curvilinear synthetic aperture radar, the signal model and imaging method for curvilinear synthetic aperture radar are discussed. The 1-D signal model, 2-D signal model for the target are deduced. And the 3-D signal model is also deduced as extension. Because different curvitinear aperture shape witt inftuence the azimuth resotution and height resotution differentty, art kinds of curvilinear aperture shapes are studied in detail, and the merits and demerits and conditions suitable for each of them are given. The conclusion is symmetric aperture shape from up to down, or from left to right can get better effect than asymmetric ones. L shape aperture will cause high side lobe. The simulation experiment can be used to direct real flight path.