Fast detection method of calibrator spaceborne sun glint based on FPGA

Yuhao Li; Feng Ji; Yadong Hu; Gaojun Chi; Zhenwei Qiu; Zhuoran Li; Feinan Chen

doi:10.1117/12.2681857

24 May 2023 Fast detection method of calibrator spaceborne sun glint based on FPGA

Yuhao Li, Feng Ji, Yadong Hu, Gaojun Chi, Zhenwei Qiu, Zhuoran Li, Feinan Chen

Proceedings Volume 12706, First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023); 127060B (2023) https://doi.org/10.1117/12.2681857
Event: First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023), 2023, Shanghai, China

Abstract

Sun glint is a serious obstacle to passive optical remote sensing images. As is the specular reflection of sunlight from the facets of the water surface, sun glint has great linear polarization characteristics, and it is usually suppressed by adding polarizers. Therefore, a spaceborne sun glint polarization parameter measurement system is developed to calculate the on-orbit sun glint parameters in real time. Firstly, we analyzed the polarizing radiation distribution model of sun glint and developed a real time detection system for polarization angle of sun glint according to the principle of spaceborne polarization imager. The system is using Xilinx V5 FPGA as the on-the-satellite processing platform, and we use high-level synthesis (HLS) tools for algorithm hardware description development. By using dataflow, pipeline and other optimization methods in HLS, we greatly reducing computing time and reducing the FPGA resource use. Finally, we use it to calculate the sun glint polarization angle through a three-channel data with a granularity of 25×25 in 670nm, the simulation results show that under the 100M clock, 54% of the slice and DSP48 FPGA resources are consumed, and the sun glint polarization angle can be calculated in 8ms time, which meets the design requirements of rapid sun glint detection.

Citation Download Citation

Yuhao Li, Feng Ji, Yadong Hu, Gaojun Chi, Zhenwei Qiu, Zhuoran Li, and Feinan Chen "Fast detection method of calibrator spaceborne sun glint based on FPGA", Proc. SPIE 12706, First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023), 127060B (24 May 2023); https://doi.org/10.1117/12.2681857

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