同时全偏振成像仪是一种基于大口径离轴三反系统的高空间分辨率偏振遥感器,它采用棱镜分振幅的同时偏振测量方法。由于仪器偏振器件多,特性复杂,导致仪器的测量矩阵偏离理想值。为保证仪器的偏振测量精度,需要进行有效的偏振定标。提出了一种利用标准线偏振光源与圆偏振光源对一种分振幅型同时偏振成像仪进行定标的方法。线偏振定标源定标仪器测量矩阵的前三列,利用最小二乘拟合傅里叶系数获得定标系数;圆偏振定标源定标仪器测量矩阵的第4列,采用将光源旋转90°测量两次求平均的方法消除光源圆偏振态的非理想性。最后通过实验验证了同时全偏振成像仪的偏振测量精度,结果表明:定标后偏振测量精度优于1%(P≤0.3)。

The simultaneous imaging polarimeter is a type of polarimetric remote sensors with high spatial resolution based on a large aperture off-axis three-mirror system, and the system adopts simultaneous polarimetric measurement based on the prism to divided amplitude. As the instrument has many polarizers and their characteristics are complex, the measurement matrix of instrument deviates from the ideal value. In order to ensure the polarization measurement accuracy of the instrument, we need an effective polarization calibration method. In this paper, a calibration method using the standard liner polarization light source and circular polarization light source is proposed for amplitude-divided simultaneous imaging polarimeter. The linear polarization calibration source calibrates the first three columns of the instrument measurement matrix. The calibration coefficients are obtained by the least-squares fitting Fourier coefficient. The circular polarization calibration source calibrates the fourth column of the instrument measurement matrix. To eliminate non-ideality of the circular polarization state of the light source, two measurements with light source rotated 90°are averaged. Finally, the polarization measurement accuracy of the simultaneous imaging polarimeter is verified by the test. The results show that the polarization measurement accuracy after calibration is better than 1%(P≤0.3).