Linescanner sensor signal acquisition was investigated as part of the NASA Multi-spectral Linear Array (MLA) design study program. This paper presents a hybrid analog and digital approach which resulted from that investigation. As part of the signal acquisition, the analog signals are converted to digital form and processed to compensate for detector nonuniformity. This method requires only an 8 bit A to D converter to compensate for bias and gain nonuniformity and still provide nearly 8 bit resolution and accuracy in the output signal. This resulted from having control of the A to D conversion range and by using on board calibration measurements with a much higher accuracy than needed in the actual data. Very little accuracy was lost as a result of the bias and gain compensation. The paper describes this advanced approach along with the calibration algorithm used to achieve such performance.
"Advanced Approach For Detector Array Signal Acquisition", Proc. SPIE 0363, Advanced Remote Sensing, (9 August 1983); doi: 10.1117/12.934171; https://doi.org/10.1117/12.934171