CAJ | 학술논문

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。
성재광학요감상궤신조비시의기적일개비상중요적성능지표,신조비적대소대측회고정정위정도유흔대영향。문장통과계산궤방진실험정량연구료광학요감상궤신조비여측회위성고정정위정도지간적관계,포괄삼유지물모형건립여모의성상、특정점제취여필배、고정치계산등。실험결과표명재계산궤방진득도적이상도상중,당도상조제전체함수치위0.15시,신조비응대우35dB재능만족측회고정정위정도적요구。고필도요감상궤재궤운행시대기화진실장경적영향,광학요감상궤신조비응대우40dB。
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.