Research On Portable Measurement Method Of Neutral Points In Atmospheric Polarization Pattern

When sunlight passes through the atmosphere,after various gas molecules and aerosol particles scattering,changing the polarization characteristics and forms a relatively stable polarization information distribution,that is,the atmospheric polarization pattern.Polarized light bionic navigation is an autonomous navigation method that uses atmospheric polarization as an information source,and has good real-time performance and anti-jamming capability.Atmospheric polarization neutral points are important parameter to describe the atmospheric polarization pattern,and is one of the key elements to the bionic navigation of polarized light.This article takes the acquisition method of atmospheric polarization pattern as a starting point,and presents a portable measurement method of atmospheric polarization in view of the disadvantages of the complicated structure and high cost of atmospheric polarization pattern detection equipment at the present stage.The details are as follows:First of all,this thesis proposes a portable measurement method of atmospheric polarization pattern.In this method,a rotatable linear polarizer is fixed in front of a mobile phone lens,and a mobile phone camera is used as a detector to measure atmospheric polarization information.The portable measurement method is used to detect the atmospheric polarization pattern in the clear sky.According to the Stokes vector method,the atmospheric polarization angle image and the atmospheric polarization degree image are obtained.Through pseudo-color processing,a more intuitive atmospheric polarization information distribution is obtained.This method has the advantages of easy operation and easy portability,and can measure the rapid of atmospheric polarization pattern.In addition,this thesis uses theoretical simulation to verify the above-mentioned atmospheric polarization portable measurement method.In this thesis,based on the theory of Rayleigh scattering,a theoretical model of atmospheric polarization distribution pattern is established,and pseudo-color images of the theoretical distribution of atmospheric polarization angle and atmospheric polarization degree are obtained.By comparing the atmospheric polarization information measured with the portable method and the theoretical results,the deviation value of the point position is(2.4°±2.6°,1.4°±0.8°),which verifies the feasibility of the portable measurement method of atmospheric polarization.The combination of mobile phone and polarizer proposed in this thesis can achieve accurate measurement of atmospheric polarization pattern.Finally,this thesis discusses the main influencing factors of the accuracy of atmospheric polarization portable measurement.In this thesis,from the four angles of portable equipment,geographic location,cloud thickness and continuous time,an atmospheric polarization pattern detection experiment is set up.By comparing the deviation between the neutral point position of the portable measurement and the theoretical result,the article finds that the influence of different portable devices on the measurement of the neutral point position was very small;By detecting the atmospheric polarization information of Guilin and Changchun,this thesis finds that the change of geographical position does not affect the use of the portable measurement method.The position of the neutral points will change as the position of the sun changes.To a certain extent,the increase in the thickness of the cloud layer will distort the distribution of the polarization angle of the sky,but the approximate position of the neutral points can still be observed,and the atmospheric polarization distribution law can be obtained.