Hardware-accelerated CCD readout smear correction for Fast Solar Polarimeter

Stefan Tabel, Korbinian Weikl, W. Stechele
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引用次数: 1

Abstract

Shutterless frame store charge-coupled devices (CCDs) are commonly used in ground-based solar observations, but the characteristical readout smear error of such devices hinders an application of frame store CCDs to autonomous missions. The combination of polarimetric modulation and image accumulation disables a correction of this error via software-based post-facto processing if in addition microvibrations occur during flight. This paper presents the first FPGA-based architecture for online smear correction of images from frame store CCDs, which allows for the usage of a certain frame store CCD camera on a balloon-borne solar observatory. First, we explore fast convolution-based algorithms with respect to their properties for an implementation. Afterwards, a hardware architecture is derived and implemented. Our results show that 400 frames of megapixel size can be corrected per second, maintaining an acceptable power consumption of less than 12 Watt. Finally, we discuss the circuit and show the degrees of freedom for further designs.
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用于快速太阳偏振计的硬件加速CCD读出涂抹校正
无快门框架存储电荷耦合器件(ccd)是地面太阳观测中常用的器件,但这种器件的读出涂抹误差特性阻碍了框架存储ccd在自主任务中的应用。如果在飞行过程中发生微振动,偏振调制和图像积累的结合将通过基于软件的事后处理来纠正这一误差。本文提出了一种基于fpga的框架存储CCD图像在线涂抹校正架构,该架构允许在气球载太阳天文台上使用特定的框架存储CCD相机。首先,我们探索基于快速卷积的算法及其实现的属性。然后,推导并实现了硬件体系结构。我们的研究结果表明,每秒可以校正400帧的百万像素大小,保持可接受的功耗低于12瓦。最后,我们对电路进行了讨论,并给出了进一步设计的自由度。
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