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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。
Incomplete coincidence of field of view is the common problem of polarization measurement. The misalignment of the field of view leads to the difference between the polarization information obtained when the target is detected and the actual polarization information, ie, the pseudo-polarization is generated. The main factors contributing to the misalignment of the field of view of time-sharing polarization are composed of two aspects: the movement of the instrument itself and the platform on which the instrument is mounted (aircraft or satellite). First of all, the basic principle of polarization measurement is introduced and the reason that the degree of coincidence of field of view affects the measurement accuracy of polarization is put forward. Secondly, combined with the research status at home and abroad, a measurement method of non-overlapping field of view is proposed. Thirdly, Field of view does not coincide with the factors and improvement measures; Finally, a satellite-based polarimetric imager as an example gives the analysis and discussion. The results show that the degree of misalignment of the field of view caused by the satellite platform after taking compensation measures is far less than that before the compensation is taken and the measurement accuracy of the instrument polarization is improved.