Zhao Huijie, Cui Bolun, Jia Guorui, Li Xudong, Zhang Chao, Zhang Xinyang
School of Instrumentation Science & Opto-electronics Engineering, Key Laboratory of Precision Opto-Mechatronics Technology, Beihang University, Ministry of Education, 37# Xueyuan Road, Haidian District, Beijing 100191, China.
Sensors (Basel). 2017 Dec 6;17(12):2829. doi: 10.3390/s17122829.
Even though digital simulation technology has been widely used in the last two decades, hardware-in-the-loop (HWIL) simulation is still an indispensable method for spectral uncertainty research of ground targets. However, previous facilities mainly focus on the simulation of panchromatic imaging. Therefore, neither the spectral nor the spatial performance is enough for hyperspectral simulation. To improve the accuracy of illumination simulation, a new dome-like skylight simulator is designed and developed to fit the spatial distribution and spectral characteristics of a real skylight for the wavelength from 350 nm to 2500 nm. The simulator's performance was tested using a spectroradiometer with different accessories. The spatial uniformity is greater than 0.91. The spectral mismatch decreases to 1/243 of the spectral mismatch of the Imagery Simulation Facility (ISF). The spatial distribution of radiance can be adjusted, and the accuracy of the adjustment is greater than 0.895. The ability of the skylight simulator is also demonstrated by comparing radiometric quantities measured in the skylight simulator with those in a real skylight in Beijing.
尽管数字仿真技术在过去二十年中已被广泛应用，但半实物仿真（HWIL）仍然是地面目标光谱不确定性研究中不可或缺的方法。然而，以往的设备主要侧重于全色成像模拟。因此，对于高光谱模拟而言，其光谱和空间性能均不足。为提高光照模拟的精度，设计并开发了一种新型穹顶状天光模拟器，以适应350纳米至2500纳米波长范围内真实天光的空间分布和光谱特性。使用配备不同附件的光谱辐射计对该模拟器的性能进行了测试。空间均匀性大于0.91。光谱失配降至图像模拟设施（ISF）光谱失配的1/243。辐射亮度的空间分布可以调整，调整精度大于0.895。通过将天光模拟器中测量的辐射量与北京真实天光中的辐射量进行比较，也证明了天光模拟器的能力。
