Fig. 1. Diagram of observation coordinate

Fig. 2. Principle block diagram of polarization detection device

Fig. 3. Schematic diagram of the internal 3D structure of the polarization detection device

Fig. 4. Experiment process of sky polarization state observation

Fig. 5. The photo of radiation calibration experiment

Fig. 6. The photo of detection experiment for polarization measurement accuracy

Fig. 7. The distribution of DOLP with wavelength obtained by experiment. (a) Without depolarizer; (b) with depolarizer

Fig. 8. DOLP distribution with wavelength after upgrade

Fig. 9. Distribution of DOLP measurement error with wavelength of the polarization detection device

Fig. 10. Determination of the direction angle of polarization transmission axis

Fig. 11. The distribution of AOP deviation

Fig. 12. The photo of the sky light polarization mode observation experiment

Fig. 13. The distribution of polarization information obtained at each point perpendicular to the main plane of the sun with the wavelength on a clean day. (a) DOLP; (b) AOP

Fig. 14. The distribution of polarization information obtained at each point perpendicular to the main plane of the sun with the wavelength on a hazy day. (a) DOLP; (b) AOP