Abstract: The polarization spectral intensity modulation (PSIM) is an advanced polarization spectral measurement technique, and it is a key step how the polarization spectral information of light under testing (LUT) is extracted from the measured data of spectropolarimeter based on PSIM by the data processing algorithm. The mathematics principle was presented on how the all elements of Stokes vector spectrum of LUT are extracted from the measured data of PSIM system, starting from the modulation mechanism of PSIM technology, combined with relevant theory of digital signal processing (DSP), and the procedure of measured data processing for PSIM spectropolarimeter system was established. The spectropolarimeter experimental device based on PSIM was set up, and the measurement experiment was carried out that the light from the parallel light pipe directly and the polarized parallel light pipe output by polarizer were measured respectively. The measured data of the experimental device was processed according to the data processing procedure established previously to extract the spectropolarimetric information from it. The good consistency between the results of theoretical analysis and that of data processing verifies the method of data processing of spectropolarimeter based PSIM is correct.

Key words: Remote sensing; Data processing methods; Transform domain signal processing; Spectropolarimeter