The communication was implemented with the absolute encoder ECN1313 by Endat interface, which was designed by FPGA of Actel Company. This project was described with Verilog language and simulated in ModelSim6.0, and A3P060 of Actel Company was used as a hardware platform in the LiberoIDE v9.0 development environment. The result indicated that it achieved the high precision requirement of sampling angle positioning for multi-angle polarized radiometer by using the value of the receiving position data and provided a guarantee for the instrument to measure atmospheric polarization spectral information.