Study on Measuring System for Characteristics and Distribution of Skylight Polarization

Cui, Yan; Chu, Jin Kui; Cao, Nan Nan; Zhao, Kai

doi:10.4028/www.scientific.net/kem.437.369

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Secondly, the E-vector direction on the solar meridian is perpendicular to the solar meridian. A relatively stable skylight polarization distribution pattern exists in the sky at a certain position during a specific time period, even in the dawn and dusk [ 15 ]. In the literature, for describing the polarization distribution pattern, the vibration direction of the polarized light represents an important parameter, which is also named the polarization direction vector.…”

Section: Sensor Modelingmentioning

confidence: 99%

A Novel Attitude Determination System Aided by Polarization Sensor

Wei

Chu

et al. 2018

Sensors

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This paper aims to develop a novel attitude determination system aided by polarization sensor. An improved heading angle function is derived using the perpendicular relationship between directions of E-vector of linearly polarized light and solar vector in the atmospheric polarization distribution model. The Extended Kalman filter (EKF) with quaternion differential equation as a dynamic model is applied to fuse the data from sensors. The covariance functions of filter process and measurement noises are deduced in detail. The indoor and outdoor tests are conducted to verify the validity and feasibility of proposed attitude determination system. The test results showed that polarization sensor is not affected by magnetic field, thus the proposed system can work properly in environments containing the magnetic interference. The results also showed that proposed system has higher measurement accuracy than common attitude determination system and can provide precise parameters for Unmanned Aerial Vehicle (UAV) flight control. The main contribution of this paper is implementation of the EKF for incorporating the self-developed polarization sensor into the conventional attitude determination system. The real-world experiment with the quad-rotor proved that proposed system can work in a magnetic interference environment and provide sufficient accuracy in attitude determination for autonomous navigation of vehicle.

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Section: Sensor Modelingmentioning

confidence: 99%

A Novel Attitude Determination System Aided by Polarization Sensor

Wei

Chu

et al. 2018

Sensors

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“…In 2000, Lambrinos and colleagues (2000) applied the navigation strategy of desert ants to the autonomous navigation of mobile robots and obtained satisfactory experimental results, which verified the mechanism of biological polarization-sensitive navigation. Since then, many scholars have developed a series of polarization navigation sensors, which can be divided into two major categories: point-source polarization detectors (Chu and Zhao 2005;Cui et al 2010;Liu et al 2015; Wang et al 2015;Chu et al 2017) and imaging polarization detectors (Vedel, Breugnot and Lechocinski 2011;Chahl and Mizutani 2012;Zhang, Zhao and Li 2013;Zhang et al 2014;Lu et al 2015). Point-source detectors are smaller, lower in cost, and easier to integrate and modify, but the distinction they capture is imperfect, making them unsuitable for applications in complex scenes.…”

Section: Introductionmentioning

confidence: 99%

Error Analysis and Optimization of a Sky Full-Polarization Imaging Detection System

Chen¹,

Tang²,

Chu³

et al. 2021

photogramm eng remote sensing

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An accurate sky polarization field map is a prerequisite for polarization navigation applications. In this article, a detector for sky full-polarization imaging detection is described, the major error-influencing factors (MEIFS ) are obtained, and the error propagation is modeled and analyzed. We reveal the relationship between the error of the inversed Stokes vector and the condition number of the detector matrix, which shows that the error of the inversed Stokes vector is affected by the Stokes vector of the incident light itself and the MEIFS together, with the MEIFS playing a decisive role. With the MEIFS optimized, the impact of detector error on the inversed Stokes vector is attenuated. A control equation for system calibration is also deduced which can establish the connection between the detector matrix design and calibration process. The work in this article provides a reference for optimization and calibration of sky full-polarization imaging detectors.

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Study on Measuring System for Characteristics and Distribution of Skylight Polarization

Cited by 2 publications

References 7 publications

A Novel Attitude Determination System Aided by Polarization Sensor

A Novel Attitude Determination System Aided by Polarization Sensor

Error Analysis and Optimization of a Sky Full-Polarization Imaging Detection System

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