关键词: TDI-CCD, 驱动时序, 现场可编程门阵列(FPGA), 相关双采样(CDS)

Abstract: Because array CCD and linear CCD don't meet the requirement of observing
the ocean goal, the time delay
integration CCD (TDI-CCD) which has high sensitivity and high signal to noise
ratio is selected and driving circuit is designed. Two ports of  outputs the signal during image capture. The driver
circuit generates the time sequence of the CCD and the A/D. The output analog
signal of the CCD is sampled by A/D and converted to the digital signal which
can be recognized by computer. FPGA is used to driving CCD and A/D, receiving the
digital signal after A/D converts, and sending the imaging data to computer.
The correlated double sampling (CDS) can decrease some related noise which
analog output signal of the TDI-CCD has, and increase the signal to noise
ratio. The code of field programmable gate array (FPGA) is simulated on the
ISE14.7. The experiment results prove that the driving circuit can
generate right sequence that CCD needs.