摘要
为提高TDI-CCD的工作性能,根据TDI-CCD器件的工作原理,较完整地分析了TDI-CCD图像的噪声组成,给出了其噪声的详细分类。TDI-CCD的噪声主要来自两个方面,一个是TDI-CCD器件本身所固有的噪声,如霰粒噪声、非均匀性噪声、暗电流噪声、固定图形噪声、转移噪声等,另一个是TDI-CCD工作过程中的各种噪声干扰,如复位噪声和1/f噪声等。根据各种噪声的特点,提出了相应的噪声处理技术,并针对KTC噪声,给出了双相关采样电路处理方式,提高了器件的信噪比,输出信噪比达到53.8 dB。
In order to improve TDLCCD performance, the noise in TDI-CCD image was analyzed and categorized according to the operating principle of TDI-CCD. TDI-CCD noise mainly comes from two ways, one is TDI-CCD proper noise, such as photo shot noise, non-uniformity noise, clark current noise,fix pattern noise, transfer noise and so on, the other is TDI-CCD noise interference in work process, such as reset noise and 1/f noise. Several noise processing methods were presented based on noise charateristics and the signal processing schemes of double-correlated sampling were given to eliminate KTC noise. As a result, the output SNR of TDI-CCD has reached up 53.8 dB.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2007年第8期1196-1202,共7页
Optics and Precision Engineering
基金
国家重大创新资助项目(No.ZB99I14H)
