星载偏振扫描仪发射前定标及地面验证实验 下载: 4332次
高精度偏振扫描仪(POSP)采用分孔径和分振幅的同时偏振测量技术,可获取目标的高精度多光谱偏振辐射信息,其测量精度是影响载荷在轨应用的关键指标之一。仪器研制完成后,实验室条件下完成偏振和辐射定标以及测量精度的评估。为检验实验室定标结果,开展自然目标探测下的地面验证实验,使用POSP在晴朗天气沿太阳主平面对天空进行扫描,将获取的天空辐亮度和偏振度数据与同时刻由CE318N太阳-天空偏振辐射计采集的数据进行对比,并讨论影响两台仪器数据的因素。实验结果表明,两台仪器的辐亮度一致性偏差小于4%,偏振度一致性偏差小于0.005,具有较好的一致性,验证POSP实验室定标的准确性及自然目标下的探测能力,可为后续星载数据的处理和应用提供依据。
High precision polarization-scanner (POSP) can obtain high precision multispectral polarization-radiation information of the target by using the simultaneous polarization-measurement technology of partial aperture and partial amplitude. Its measurement accuracy is one of the key indexes affecting in-orbit application of load. After the instrument is developed, polarization and radiometric calibration and measurement accuracy evaluation are completed under laboratory conditions. To test laboratory calibration results, we carry out the natural target detection under the ground of the verification experiment. The sky is scanned along the main plane of the sun with POSP in a clear day. The data of sky radiance and polarization degree obtained are compared with the data collected by CE318N sun-sky polarization radiometer at the same time, and the factors affecting the data of the two instruments are discussed. The experimental results show that the two instruments have a good consistency, with the consistency deviation of radiance and polarization less than 4% and 0.005, respectively. The accuracy of POSP laboratory calibration and the detection ability under natural targets are verified, which can provide a basis for the subsequent processing and application of space-borne data.
李朕阳, 刘振海, 邹鹏, 朱双双, 雷雪枫, 陶菲, 提汝芳, 宋茂新, 洪津. 星载偏振扫描仪发射前定标及地面验证实验[J]. 光学学报, 2021, 41(3): 0312002. Zhenyang Li, Zhenhai Liu, Peng Zou, Shuangshuang Zhu, Xuefeng Lei, Fei Tao, Rufang Ti, Maoxin Song, Jin Hong. Prelaunch Calibration and Ground Verification Test of Spaceborne Particulate Observing Scanning Polarimeter[J]. Acta Optica Sinica, 2021, 41(3): 0312002.