Design and Implementation of TDI CCD Imaging Circuits in Space Applications

Imaging circuits of converting light signals to electrical signals is designed for different remote sensing satellites with different sensors in space applications. Based on a TDI CCD sensor, this paper presents the detailed design and implementation of imaging circuits which is more suitable for use on commercial satellites. This paper utilizes industrial-grade electronics to achieve imaging circuits, which becomes effective solutions to reduce the costs of remote sensing satellites. The signal processors receive analog output signals of TDI CCD to convert digital signals. The core processor, FPGA, receives and processes digital signals them from the signal processors and delivers to transceivers. The transceivers receive the image data from FPGA and deliver them to the host computer. Moreover, a schematic of the completed board of TDI CCD imaging circuits is presented. Finally, to verify the performance of the imaging circuit, the HCTF of TDI CCD was measured on this CCD imaging circuit. The measured result is consistent with the product manual, which shows that the imaging circuits perform well.