摘要
在高分辨率光学遥感成像过程中,卫星平台的不稳定性将影响相机成像质量。针对该问题,在分析动态降质机理的基础上分别就面阵凝视模式、线阵推扫模式及时间延迟积分(Time Delay and Integration,TDI)推扫模式提出了相应的动态成像仿真模型,以此模拟不同情况下的退化结果。以高分辨率遥感相机为对象,开展多种情况下的仿真试验分析。结果表明,同等平台运动条件下,TDI推扫模式下的图像质量下降更明显;分辨率越高,像质对平台振动的响应灵敏度越高。最后结合仿真模型及图像评价参量,建立起空间分辨率与平台颤振指标之间的关系,给出不同空间分辨率下的平台运动误差阈值,为平台振动抑制和补偿提供约束条件。
During the imaging progress of space based high-resolution camera,the image quality will be affected by instability of satellite platform.Aimed to this problem,mechanism of image quality degradation due to image motion was firstly analyzed and then different simulation models for staring,linear scanning and time delay and integration imaging modes were brought up to simulate images caused by image motion.The high-resolution remote sensor was then taken as the simulation example to analyze image quality under different conditions.The results show that more image degradation is brought by vibration for TDI imaging mode and image quality is more sensitive to platform vibration with higherresolution.At last,the relation between spatial resolution and platform vibration parameters was built and tolerances of vibration amplitude were given according to degradation model and image quality evaluation,which can provide references for parameters of stabilization devices.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2017年第3期86-92,共7页
Chinese Space Science and Technology
关键词
平台运动
光学成像
高分辨率
仿真模型
图像质量
platform vibration
optical imaging
high resolution
simulation model
image quality
