星载TDI CCD相机MTF和SNR综合响应模拟方法  

Method of MTF and SNR comprehensive response simulation for spaceborne TDI CCD camera

作　　者：岳庆兴[1] 唐新明[1] 高小明[1] 

机构地区：[1]国家测绘地理信息局卫星测绘应用中心,北京100830

出　　处：《国土资源遥感》2013年第2期8-14,共7页Remote Sensing for Land & Resources

摘　　要：为了对星载时间延迟积分电荷耦合器件(time-delayed-integration charge coupled device,TDI CCD)相机动态成像过程中各环节的调制传递函数(modulation transfer function,MTF)和信噪比(signal noise ratio,SNR)的退化机制进行研究,以各个环节MTF和SNR的数学模型为节点,以信号传输和转换过程为主线,探讨了各个环节的信号描述及MTF和SNR退化模拟方法;提出以快速傅立叶变换和特定分布随机数生成算法为基础的MTF和SNR综合响应数学模拟流程。上述方法可以对单一环节或几个连续环节的MTF和SNR综合响应进行模拟。利用该方法对TDI CCD相机的沿轨MTF、穿轨MTF和SNR进行了模拟试验。The mechanism of MTF（ modulation transfer function） and SNR（ signal noise ration） degradation in the spaceborne TDI CCD （time - delayed - integration charge coupled device ） optical camera imaging process was studied in this paper. Using the mathematic models at different stages as nodes and the signal transmission and conversion process as the framework, the authors studied the descriptive means for the signal and simulation method of MTF and SNR degradation in every node. The MTF and SNR simulation flow of synthetically response was brought forward on the basis of FFT and random noise of given distribution creating arithmetic. The method mentioned above can be applied to the MTF and SNR comprehensive response simulation in one or several links. The simulation test of TDI CCD camera was conducted crossing orbit MTF and along orbit MTF and SNR by using this method.

关 键 词：TDI CCD MTF SNR 数学模拟 综合响应 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]