FPGA-based data processing module design of on-board radiometric calibration in visible/near infrared bands
2015
FPGA technology has long been applied to on-board radiometric calibration data processing however the integration of
FPGA program is not good enough. For example, some sensors compressed remote sensing images and transferred to
ground station to calculate the calibration coefficients. It will affect the timeliness of on-board radiometric calibration.
This paper designs an integrated flow chart of on-board radiometric calibration. Building FPGA-based radiometric
calibration data processing modules uses system generator. Thesis focuses on analyzing the calculation accuracy of
FPGA-based two-point method and verifies the feasibility of this method. Calibration data was acquired by hardware
platform which was built using integrating sphere, CMOS camera (canon 60d), ASD spectrometers and light filter
(center wavelength: 690nm, bandwidth: 45nm). The platform can simulate single-band on-board radiometric calibration
data acquisition in visible/near infrared band. Making an experiment of calibration coefficients calculation uses obtained
data and FPGA modules. Experimental results show that: the camera linearity is above 99% meeting the experimental
requirement. Compares with MATLAB the calculation accuracy of two-point method by FPGA are as follows: the error
of gain value is 0.0053%; the error of offset value is 0.00038719%. Those results meet experimental accuracy
requirement.
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