第三章 SAR 基本原理_2007-3-21.pdfVIP

第三章SAR 基本原理 SAR基本原理纲要 • 第一讲：SAR图像几何特征 • 第二讲：SAR图像辐射特征 • 第三讲：SAR系统与SAR产品 RADAR：radio detecting and ranging 基础知识及定义 参考书目： 1.肖国超、朱彩英. 雷达摄影测量. 地震出版社，2001 。 2.John C. Curlander, Robert N. McDonough. Synthetic Aperture Radar Systems and signal Processing. John Wiley Sons,1991. 韩传钊译，电子工业出版社，2006 。 3.袁孝康. 星载合成孔径雷达导论。国防工业出版社。2003 。 几何特征参数 • 入射角、视角、俯角 • 斜距（近距、远距）、地距、方位 • 透射收缩、顶底位移、阴影 SAR Flight Geometry • Pulses of active microwave electromagnetic energy illuminate strips of the terrain at right angles (orthogonal) to the direction of travel – called the range or look direction – The terrain illuminated nearest the aircraft is the near-range – The farthest point of terrain illuminated is the far-range RANGE —— Line of sight between the radar and the illuminated target RANGE DIRECTION —— Perpendicular to flight direction (or azimuth) of the sensor —— Also referred to as the cross-track direction RANGE RESOLUTION —— An image characteristic determined by the system bandwidth or effective length of the pulse AZIMUTH –Commonly used to indicate the linear distance in the along track direction AZIMUTH DIRECTION –Direction parallel to the line of flight also referred to as the along-track direction AZIMUTH RESOLUTION – Resolution characteristic of the azimuth dimension – Limited by the Doppler bandwidth of the system Range resolution Azimuth resolution Incident angle Incident angle: defined as the angle between the radar- of sight and the local