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有效提取大气偏振模式信息是实现偏振光导航应用的前提条件。借鉴昆虫偏振敏感机理,设计了一种基于“3对偏振对比单元+1个光强检测单元”的仿生偏振光检测系统,详细阐述了光学前端接收结构、信号调理及主控硬件电路等功能模块设计。针对偏振正交误差的影响,基于激光器、调节台、偏振分析仪搭建了系统测试标定平台,并分别在室内暗场和室外晴朗天气下对传感器系统的输出偏振角进行了测试。结果表明,该系统偏振角平均误差小于0.5°,能够提供准确的航向信息,实现大气偏振模式的稳定获取。
Effectively extracting atmospheric polarization mode information is a prerequisite for the application of polarized navigation. Based on the insensitive polarization mechanism of insects, a biomimetic polarization detection system based on “3 pairs of polarization contrast cells + 1 intensity detection unit” was designed, and the structure of optical front end receiver, signal conditioning and host hardware circuits were described in detail. Functional module design. Aiming at the influence of orthogonal error of polarization, a system of test and calibration platform was built based on laser, tuning table and polarization analyzer. The output polarization angle of the sensor system was tested in the indoor dark field and outdoor clear weather respectively. The results show that the average error of the system polarization angle is less than 0.5 °, which can provide accurate heading information and achieve stable acquisition of atmospheric polarization mode.