视场重合程度对分时偏振测量精度的影响

视场不完全重合是偏振测量的共性问题。视场不重合导致对目标探测时获取的偏振信息与真实的偏振信息存在差异,即产生伪偏振。造成分时偏振测量视场不重合的主要因素由两方面构成:仪器自身和仪器所搭载平台(飞机或卫星)的运动状态。首先介绍了偏振测量的基本原理,提出了视场重合程度影响偏振测量精度的原因;其次,结合国内外研究现状,提出了视场不重合的度量方法;再次,重点分析了星载背景下影响视场不重合的因素以及改进措施;最后以某星载偏振成像仪为例给出了分析结果并讨论。结果表明:采取补偿措施后由卫星平台造成的视场不重合程度远小于采取补偿前,仪器偏振测量精度得到了提高。

Influence of field of view alignment on division of time polarimetry accuracy

Nearly all polarization measurement suffers from field of view (FOV) misalignment. FOV misalignment would result in discrepancy between the polarization measurement to the target and actual polarization information, named artificial polarization. Instrument and the platform (plane or satellite) movement are the main factors resulting in FOV misalignment of division of time polarization measurement. First of all, the principle of polarization measurement was discussed. The reason of FOV alignment influencing on polarimetry accuracy was described. Then the method on measurement on FOV alignment was proposed on reviewing and summarizing domestic and international current research. After that, factors on influence of FOV alignment space borne and the compensate effect were analyzed in detail.Finally, the discussion on a imaging Polarimeter was shown. Results indicate that FOV misalignment caused by satellite is decreased after compensation. Polarimetry accuracy was increased.