Prof. Shensen Hu Profile

Prof. Shensen Hu

at NUDT

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Publications (3)

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Proceedings Article | 6 November 2023 Paper

Nighttime satellite light view of Kherson on the front line of the Russia-Ukraine conflict

Mingyu Chen, Hanke Zhang, Shensen Hu, Xinyi Zhoufang, Dingyuan Tian

Proceedings Volume 12921, 1292117 (2023) https://doi.org/10.1117/12.2688194

KEYWORDS: Satellites, Light sources and illumination, Quality control, Earth observing sensors, Satellite imaging, Low light imagers, Spatial resolution, Meteorological satellites, Light sources, Clouds

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The low-light imager on the satellite is able to sense changes in lights on the ground at night, including those caused by military conflicts on the ground. In this paper, we analyze the light change data of Kherson, which is the front line of Russia-Ukraine conflict that started on February 24, 2022. Two parameters, the number of light pixels and the average intensity of light pixels in the target area were used to assess the battlefield situation in this paper. Through image processing and data analysis, it can be found that the number of light pixels in Kherson decreased by 42.8% from February to March, and the average intensity of light pixels decreased by 23.1%. Based on this, we propose the parameter of relative light ratio to reduce the influence of other factors, such as low-light imager payload itself and moonlight, on the number of light pixels and the average intensity of light pixels. As a result, we can reduce the degree of fluctuation of daily light data in Kherson by comparing it with two parameters in two reference cities, Krasnodar and Rostov-on-Don. The relative light ratios of the number of light pixels and the average intensity of light pixels for Kherson and either reference city were calculated one by one, and it was found that fluctuation of the relative light ratios was significantly smaller, and the relative light ratio of both parameters decreased greatly from February to March, which was consistent with time of the beginning of Russia-Ukraine conflict.

Proceedings Article | 2 July 2021 Paper

Research on the spatial resolution of space-borne one-dimensional multifrequency synthetic aperture microwave radiometer for SST remote sensing

Maohong Liu, Weihua Ai, Mengyan Feng, Guanyu Chen, Wen Lu, Shensen Hu

Proceedings Volume 11887, 118870C (2021) https://doi.org/10.1117/12.2603101

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Space-borne One-dimensional multifrequency synthetic aperture microwave radiometer (1D-MSAMR) offers new possibilities for detecting high spatial resolution sea surface temperature (SST). To achieve simultaneous observation of multifrequency, we present a spatial resolution calculation model of 1D-MSAMR. Based on this model, the relationship between spatial resolution and antenna parameters are discussed thoroughly in this paper. In addition, we present a set of antenna parameters which can realize the simultaneous observation. The results indicate that the spatial resolution is symmetrical with the change of incidence angle, and the larger the incidence angle, the lower the spatial resolution; the spatial resolution is improved by increasing the minimum antenna spacing, increasing the maximum baseline, or increasing the operating frequency; and to achieve simultaneous observation with multiple frequencies the minimum baseline and the maximum baseline of each frequency need to be consistent. A reasonable antenna parameter scheme for 1D-MSAMR is proposed based on spatial resolution characteristics.

Proceedings Article | 12 March 2021 Paper

Radiometric calibration of low light imager based on specialized light sources

Shuo Ma, Shensen Hu, Yunxian Huang, Wei Yan

Proceedings Volume 11763, 1176323 (2021) https://doi.org/10.1117/12.2586321

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Due to the advances in the low light imagers and high quality of the related night time data products, some related applications such as fishery activities, fog detection, gravity wave and internal solitary wave parameters retrieval, armed conflicts and disasters have been greatly promoted. However, the indirect radiometric calibration at night brings some uncertainties. Thus, the directly radiometric calibration of low light imagers is urgent and important to produce high quality data products. As the relatively stable light emissions may also be obtained by the low-level light imager at night, the calibration method of low-level light imager based on self-design light source are provided. a low-light calibration light source based on the integrating sphere which has good radiance uniformity and stable emission radiation was designed and developed to further improve the calibration accuracy. Based on the test and analysis of its radiative characteristics in the laboratory, the low-light calibration experiment based on the integrated sphere light source is performed in the Dunhuang site. The results show that the observations are consistence with the simulations, which means that the self-design light source is a good way to calibrate the low light imager. As the new generation of space borne low light sensors own higher spatial resolution and multispectral camera covering the range from blue to NIR, some calibration problems of the further low light sensors are also discussed.

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