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Sensors 2015, 15(3), 5895-5913; doi:10.3390/s150305895

An Evaluation of Skylight Polarization Patterns for Navigation

College of Mechatronic Engineering and Automation, National University of Defense Technology, Changsha 410073, Hunan, China
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Author to whom correspondence should be addressed.
Academic Editor: Gert F. Trommer
Received: 23 October 2014 / Revised: 15 December 2014 / Accepted: 28 February 2015 / Published: 10 March 2015
(This article belongs to the Special Issue Inertial Sensors and Systems)
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Abstract

Skylight polarization provides a significant navigation cue for certain polarization-sensitive animals. However, the precision of the angle of polarization (AOP) of skylight for vehicle orientation is not clear. An evaluation of AOP must be performed before it is utilized. This paper reports an evaluation of AOP of skylight by measuring the skylight polarization patterns of clear and cloudy skies using a full-sky imaging polarimetry system. AOP measurements of skylight are compared with the pattern calculated by the single-scattering Rayleigh model and these differences are quantified. The relationship between the degree of polarization (DOP) and the deviation of AOP of skylight is thoroughly studied. Based on these, a solar meridian extracted method is presented. The results of experiments reveal that the DOP is a key parameter to indicate the accuracy of AOP measurements, and all the output solar meridian orientations extracted by our method in both clear and cloudy skies can achieve a high accuracy for vehicle orientation. View Full-Text
Keywords: angle of polarization (AOP); degree of polarization (DOP); quantitative analysis; solar meridian; navigation angle of polarization (AOP); degree of polarization (DOP); quantitative analysis; solar meridian; navigation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ma, T.; Hu, X.; Zhang, L.; Lian, J.; He, X.; Wang, Y.; Xian, Z. An Evaluation of Skylight Polarization Patterns for Navigation. Sensors 2015, 15, 5895-5913.

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