Modeling and analysis of orientation measurement error based on polarization imaging

Zhen-hua WAN; Kai-chun ZHAO; Ji-kui CHU

doi:10.3788/OPE.20192708.1688

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Modeling and analysis of orientation measurement error based on polarization imaging

Modern Applied Optics | 更新时间：2020-08-13

- Modeling and analysis of orientation measurement error based on polarization imaging
- Optics and Precision Engineering Vol. 27, Issue 8, Pages: 1688-1696(2019)
- 作者机构：
  
  1.大连理工大学机械工程学院，辽宁大连 116023
  2.清华大学精密仪器系，北京 100084
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192708.1688
  CLC： TP212.14
- Received：08 October 2018，
  
  Accepted：09 November 2018，
  
  Published：15 August 2019
- 稿件说明：
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Zhen-hua WAN, Kai-chun ZHAO, Ji-kui CHU. Modeling and analysis of orientation measurement error based on polarization imaging[J]. Optics and precision engineering, 2019, 27(8): 1688-1696.
DOI：

Zhen-hua WAN, Kai-chun ZHAO, Ji-kui CHU. Modeling and analysis of orientation measurement error based on polarization imaging[J]. Optics and precision engineering, 2019, 27(8): 1688-1696. DOI： 10.3788/OPE.20192708.1688.

摘要

为了提升偏振成像定向传感器的测角精度，建立了基于斯托克斯矢量的偏振方位测量误差传播模型。对该模型受到的主点偏移、镜头畸变、CMOS平面倾斜等误差因素进行研究。根据斯托克斯矢量偏振测量原理推导出天空偏振方位角解算方法。将主点偏移、镜头畸变、CMOS平面倾斜、灰度响应不一致等因素对方位测量的影响进行讨论，利用蒙特卡洛方法进行偏振成像方位测量误差分析，通过仿真和天空偏振成像实验分析所建模型的正确性。实验结果表明：CMOS灰度响应不一致对方位测量误差的影响最大，当灰度响应不一致在(-6，+6) pixel时，测量误差在0.11°内，角度均值整体有0.12°偏移；在主点偏移(-1.5，+1.5) pixel，镜头畸变(-1，+1) pixel，CMOS平面倾斜(-0.5°，+0.5°)，CMOS灰度响应不一致(-6，+6) pixel的共同影响下，太阳子午线的方位测量误差为0.236 3°(

)。该误差传播模型能够反映误差源定量影响方位测量精度，为偏振成像定向传感器的优化设计提供依据和参考。

Abstract

To improve the angular accuracy of the polarization imaging orientation sensor

an error propagation model of the polarization imaging orientation sensor based on Stokes vector was established. The principal point deviation

lens distortion

and CMOS planar inclination were studied. First

the polarization azimuth calculation method was derived according to the polarization measurement principle of the Stokes vector. Then

the effects of principal point deviation

lens distortion

CMOS plane tilt

and gray response inconsistency were explored. The Monte Carlo method was used to analyze the measurement error of the polarization azimuth. The rationality of the model established was verified by simulation and skylight imaging experiments. The experimental results show that the CMOS gray response inconsistency has the greatest impact on the measurement error of orientation. In the range of (-6

6) pixels

the measurement error is within 0.11°

and the mean has an overall offset of 0.12°. The principle point deviation changes (-1.5

+1.5) pixels

the distortion shifts (-1

+1) pixel

the CMOS plane tilt is (-0.5°

+0.5°)

and the CMOS gray response deviation is (-6

+6) pixels; under the joint action

the measurement error of orientation is 0.236 3°(

). The error propagation model may reflect how the error source impacts the accuracy of orientation measurement

and it provides a basis and reference for optimal design of the polarization imaging orientation sensor.

关键词

Keywords

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