关于星载光学遥感相机信噪比指标的讨论  

Discussion on SNR Specification in Spaceborne Optical Remote Sensing Camera

作　　者：傅鹏[1] 朱近[1] 孙世君[2] 孙权森[1] 夏德深[1] 

机构地区：[1]南京理工大学计算机科学与技术学院,南京210094 [2]北京空间机电研究所,北京100076

出　　处：《航天返回与遥感》2012年第2期67-72,共6页Spacecraft Recovery & Remote Sensing

摘　　要：星载光学遥感相机信噪比是仪器的一个非常重要的性能指标,信噪比的大小对测绘高程定位精度有很大影响。文章通过计算机仿真实验定量研究了光学遥感相机信噪比与测绘卫星高程定位精度之间的关系,包括三维地物模型建立与模拟成像、特征点提取与匹配、高程值计算等。实验结果表明在计算机仿真得到的理想图像中,当图像调制传递函数值为0.15时,信噪比应大于35dB才能满足测绘高程定位精度的要求。考虑到遥感相机在轨运行时大气和真实场景的影响,光学遥感相机信噪比应大于40dB。Signal-Noise-Ratio（SNR） is a very important performance specification of spaceborne optical remote sensing camera,which has great effect on elevation precision.A computer simulation experiment is introduced in this paper,which can quantitatively study the influences of SNR of optical remote sensing image on elevation precision.The simulation experiment includes 3D modeling and imaging,image feature points extracting and matching,elevation value calculating and so on.The results of this experiment show that with ideal image,SNR should be larger than 35dB to satisfy the elevation precision when value of MTF（Modulation Transfer Function） is 0.15.Considering the influences of the atmosphere and the real scene when remote sensing camera is on orbit,SNR of remote sensing camera should be larger than 40dB.

关 键 词：测绘 光学遥感相机 信噪比 高程定位精度 仿真 

分 类 号：V416.6[航空宇航科学与技术—航空宇航推进理论与工程]