摘要
为了对卫星振动图像进行稳像处理,分析了卫星振动对时间延时积分(TDI)电荷耦合器件(CCD)成像质量的影响,提出了一种对卫星振动进行补偿的方法。首先介绍了TDICCD的工作原理及其对振动的敏感性,然后以调制传递函数(MTF)为评价标准研究了振动对TDICCD成像质量的影响,重点分析了TDICCD积分级数与振动的关系。通过对卫星振动数据的具体计算表明,TDICCD的积分级数越大,卫星振动对成像质量的影响越严重。当TDICCD积分级数大于或等于54时,MTF值已下降到95%以下。根据分析结果,提出了基于快速CCD的卫星振动检测方法和基于振镜的卫星振动补偿方法来补偿卫星振动对TDICCD成像质量的影响。在卫星振动检测技术中,提出了一种改进的灰度投影算法来检测卫星振动参量,检测误差不超过0.5个像素。
In order to realize image stabilization on vibrated image captured by an airborne TDICCD, the effect of satellite vibration on imaging quality of TDICCD is analyzed, and a method on compensation to satellite vibration is proposed. First, the principle of a TDICCD is introduced, and the characteristic that a TDICCD differs from others is that a TDICCD is especially sensitive to vibration. Then, the effect of vibration on a TDICCD camera is analyzed by taking the MTF as an evaluation standard. As an emphasis, the relationship between vibration and TDICCD integration stage is researched. Finally, by using the satellite vibration data, the effect of satellite vibration on TDICCD is calculated. Results indicate that as the integration stage increases, MTF decreases greatly. When the integration stage increases to 54, the MTF decreases to below 0.95. Based on the analysis, vibration detecting method based on high-speed CCD and vibration compensating method based on vibration mirror are proposed to compensate the influence of satellite vibration. Aimed at the former,an improved gray projection algorithm is proposed to detect the parameters of satellite vibration, and the error is not more than half a pixel.
出处
《光电工程》
CAS
CSCD
北大核心
2010年第12期11-16,共6页
Opto-Electronic Engineering
基金
中科院重大科研装备研制项目
关键词
稳像
卫星振动
TDICCD
调制传递函数
灰度投影算法
image stabilization
satellite vibration
TDICCD
modulation transfer function
gray projection algorithm
