Stokes parameter is the intensity dimension to describe polarized wave.Stokes parameter is widely used in electromagnetism measure

synthetic aperture and radiometer.The digital method given in the paper has the characters of high-bandwidth and high-stability.The measure error contributed by digital sampling for Stokes parameter solution is analyzed in detail in the paper.The brightness temperature quantization error under auto-correlation is proved to be less than 1*10

-5

K in application with 3 bits quantization.Further the paper gives the system sensitivity

analyzes the brightness temperature error generated by the digital quantization.When quantization is above 3 bits

the digital system sensitivity can achieve 95% of i

deal analog system.The theory foundation of digitization solution is given to prove its feasibility for different demand in different device.