机载三维成像激光雷达实时探测精度分析  

Analysis of real-time detection accuracy of airborne three-dimensional imaging radar

作　　者：郑秋贞[1] 杨华军[1] 李东[1] 朱颖[1] 

机构地区：[1]电子科技大学物理电子学院,四川成都610054

出　　处：《激光与红外》2011年第6期612-615,共4页Laser & Infrared

基　　金：预研项目(No.G020104PJ09DZ0246)资助

摘　　要：为了提高机载增益调制型三维成像激光雷达系统实时探测时的测距精度,推导了该激光雷达的测距公式,可以得出距离精度与探测器探测到的光强密切相关,机载实时探测时各种运动引起的像移会通过强度图来影响测距精度和成像质量。基于光学成像原理和坐标变换矩阵原理,分析了该激光雷达实时探测时飞行器姿态变化对成像质量的影响,分析结果显示,飞行器姿态变化对z方向的位移影响最大为0.0298个像素,可以忽略不计,而对x,y方向像移影响比较大。研究了飞行器同一个姿态变化对地面点的像移影响,研究结果表明,像移会随着地面物点对光轴的夹角和飞行方向的夹角改变而改变。In order to improve the ranging accuracy of gain modulation three-dimensional imaging ladar,ranging formula of imaging system is derived,which indicate that ranging accuracy depends on light intensity that is detected by detector.Image change caused by a variety of motions will affect the range accuracy and imaging quality through light intensity.Based on the principle of optical imaging and coordinate transformation matrix,the effect on image quality and range accuracy are analyzed when the aircraft attitude amounting the laser radar changes.The results show that the change of flight attitude,which will lead to a maximum value of 0.0298 pixels in z direction can be ignored.While the impact on the x,y direction is relatively large.For the same change of the aircraft attitude,image motion will change with the angle between ground point and beam axis.It also changes with the angle between ground point and flight direction.

关 键 词：像移 增益调制 飞行器姿态 坐标变换矩阵 

分 类 号：TN958.98[电子电信—信号与信息处理]