基于像素偏振阵列的图像传感器航向角检测

Heading angle detection based on pixel polarized array image sensor

目的:模仿昆虫的导航能力,研究基于像素偏振阵列结构图像传感器的偏振导航方法。方法:使用具有像素偏振阵列结构的芯片搭建偏振导航传感器,采用两种航向角解算方法进行导航实验。在基于图像的航向角计算方法中,以太阳子午线方向建立新的坐标体系后重绘偏振角图片,提取出所有偏振角接近90°的特征点位置进行直线拟合,结合实际太阳方位角解算出航向角。结果:两种导航方法均实现了航向角检测,基于图像的航向角解算方法精度较高,航向角测量最大误差为0.882°,误差均值为0.332°。结论:基于像素偏振阵列结构的图像传感器实现了航向角检测,精度满足导航需求。

Aims:The polarization navigation method of image sensor based on pixel polarized array structure is studied by simulation the navigation of insects.Methods:Polarization navigation sensor is constructed using a pixelated polarizer array chip.Two heading angle calculation methods were used in navigation experiment.In the image-based heading angle calculation method,the polarization angle picture was redrawn after a new coordinate system is established in the direction of the solar meridian.From the polarization angle picture,all the feature points with the polarization angle close to 90°are extracted for straight line fitting.Heading angle can be calculated from the solar azimuth angle and geographic solar azimuth.Results:Both navigation methods achieve heading angle detection.Experiments show that the image-based heading angle solution method has high accuracy with the maximum error of heading angle of 0.882°and the average error of 0.332°.Conclusions:The image sensor structure realized the heading angle detection based on the pixel polarization array,and the accuracy meets the navigation requirements.