Dr. Haofei Wang Profile

Dr. Haofei Wang

at National Satellite Meteorological Center of China

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Publications (2)

Proceedings Article | 24 May 2023 Paper

Polarization sensitivity calibration of the non-polarization channel of polarization multiangle imager onboard Fengyun satellite

Haofei Wang, Peng Zhang, Dekui Yin, Jian Shang, Xiuqing Hu, Zhengqiang Li

Proceedings Volume 12706, 1270615 (2023) https://doi.org/10.1117/12.2683135

KEYWORDS: Polarization, Calibration, Satellites, Clouds, Radiometric calibration, Polarized light

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The polarization instrument of Fengyun-3 precipitation satellite is the first Polarization and Multi-Angle Imager (PMAI) with short-wave infrared channel in China, aiming to accurately measure the radiation characteristics of clouds and aerosols in the atmosphere. The accuracy of radiometric measurement is an important technical index of instrument performance, which is of great significance for the inversion of high-precision quantitative parameters of satellite remote sensing. For the non-polarization channel of a polarization imager, polarization is a kind of interference information, and the polarization sensitivity of the instrument needs to be inverted and quantitatively removed to improve the accuracy of radiation calibration. A method of least squares fitting response value of complete linear polarization incident light based on different polarization angles is proposed to measure the polarization sensitivity of the non-polarization channel full field of view. According to the measured polarization rate of each channel and the polarization characteristics of the incident light, the polarization sensitivity of each channel is calibrated based on the polarization calibration model. The results show that the polarization sensitivity of the non-polarization channel shows obvious edge effect, gradually increasing from the center of the focal plane to the edge, and has obvious spectral differences, the smaller the wavelength having the higher the polarization sensitivity. The maximum polarization sensitivity occurs in the edge field of view of the non-polarization channel in the 1030nm band, close to 1.6%, which has a great impact on the accuracy of radiometric calibration. After polarization sensitivity calibration, the polarization sensitivity of the edge field of view is within 0.5%. The results show that by calibrating the polarization sensitivity of the full field of view of the non-polarization channel, the radiometric calibration can be effectively improved, which provides strong support for high-precision quantitative remote sensing.

Proceedings Article | 18 December 2019 Paper

An impact study of NDVI on the BPDF model under different atmosphere and multi-angles conditions

Bangyu Ge, Zhengqiang Li, Weizhen Hou, Yan Ma, Yisong Xie, Haofei Wang, Sifeng Zhu, Jie Chen

Proceedings Volume 11338, 1133834 (2019) https://doi.org/10.1117/12.2547899

KEYWORDS: Atmospheric modeling, Reflectivity, Aerosols, Vegetation, Bidirectional reflectance transmission function, Remote sensing, Atmospheric particles, Near infrared, Satellites, Polarization

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