Research On The Calibration Of The Real-time Measurement Device Of Full-sky Atmospheric Polarization Patten

Bionic polarized navigation, which based on the natural polarization characteristics, is autonomous. In recent years, it receives more and more attention, because of its characteristic that it is difficult to be interferenced and destructed by human factors in a wide range. It is of great significance and has broad application prospects to autonomous navigation, especially in the weak/no satellite signal environment. The atmospheric polarization pattern is a specific polarization distribution, which is formed during the sunlight transmission in the atmosphere due to atmospheric scattering. Bionic polarized navigation is determined by the atmosphere polarization patten detection and calculation, to achieve the attitude of the carrier. Therefore, the study of the atmosphere polarization pattern and its variation of is significant.The dissertation focuses on the error analysis of the real-time measuring device of full-sky atmospheric polarization patten. Schemes are designed to calibrate the system for all error sources. Results show that the measurement error of degree of linear polarization is less than 5%, while the measurement error of the angle of polarization is less than 3%.The main contents are included as follows:(1)Referring to demand of the measurement of the full-sky atmospheric polarization pattern, a real-time measuring device of full-sky atmospheric polarization patten is designed, based on a detailed analysis of principle of polarization imaging measurement.The device uses the three-way prism polarization imaging measurement system, to achieve a full-sky area polarization images of three different polarization angles simultaneously.(2)The analysis of the main reasons for the measurement error generated by the deviation of the polarization direction of the polarizer, gray response inconsistencies and the image pixel offset of the three channels of the system is given. Solutions are proposed to complete the calibration of the system. Experiment and data analysis are followed.(3)The mueller matrix of the device is calibrated.And by conducting experiments and analyzing the results of the measurements, the accuracy of the real-time measuring device of full-sky atmospheric polarization patten is verified.