Formula to calculate Pixel Values of the spectral channels

Hi! Friends I have a parrot sequoia sensor, I need to know the pixel value of the NIR and Red Channels, probably u can help me. I found on the internet a PDF document mark as SEQ-AN-01 where there is a formula to calculate this p=(A(eps)(lamnda)+C)I/f^2+B. The problem is that we do not find in the metadata of the frames Xmp.Camera.SensorModel
neither A, B and C coefficients.
The software version is 1.0.2. of our sensor, Does anyone have a clue?
thank you