基于数字相关双采样的CCD控制器天文应用研究

Digital correlated double sampling is a new attractive technique in CCD controller. With digital CDS, it can be made possible that digital signal processing is done within front end of the controller and brings a lot of advantage. But experiments, tests and analysis are necessary to decide whether this new technique is fit for astronomical observation..In our proposal, a testing system based on a high performance astronomical detector controller is built to evaluate digital CDS with comparison of two CDS methods. The performance testing is focus on noise, quantum effect and linearity, which are the most important performance parameters, then find out the advantages of each CDS methods. In addition, the evaluation of the digital signal processing will focus on whether it brings distortions to CCD signal and which processing method is reliable. The experiments and test above will help to decide whether digital CDS can be applied in astronomical observation and provide technical support when a CCD controller with digital CDS is built.

数字相关双采样技术是目前天文CCD控制研制中的一个热点，此技术能够将目前成熟的数字处理方法应用到CCD控制器中。但是新的技术是否具备满足天文观测的可信度以及其适用范围，需要通过谨慎的、系统地测试和分析。.本项目拟基于已有的高性能天文传统CCD控制器建立一套针对数字CDS技术的评估系统，此系统的特点是能同时对两种CDS方式进行对比试验，对基于两种CDS技术的CCD控制器的噪声水平、量子效应以及线性度等性能指标进行研究，探索各自的优势。另外由于数字处理方法的引入，需要对经过数字处理后的信号的可信度进行评估，从而确定使用的数据处理方法是否合理。通过以上研究，将为数字CDS技术运用到天文观测中提供依据，并且为将来构建基于数字CDS技术的CCD控制器提供技术支持。