介绍了一种以半导体发光二极管(LED)和溴钨灯为光源的光谱可调谐地面景物光谱辐射源, 及其系统结构和控制系统设计。利用地物光谱辐射源模拟了大量不同地物光谱, 在控制系统中建立了地物光谱数据库, 引进了改进型遗传算法匹配出了光谱数据库中的500余种地物光谱。进而详细分析了几种典型地物的光谱匹配相似度, 平均光谱匹配误差以及全波段, 红, 绿, 蓝和近红外波段光谱匹配相似度。目标辐亮度为50W·(m2·sr)-1时, 地物光谱辐射源平均光谱匹配误差在10%以内, 最低可达6.0%;全波段光谱匹配相似度高于0.895, 最高可达0.983;对于同一景物光谱红、绿、蓝和近红外波段(特别是绿光和近红外波段)光谱匹配相似度低于全波段, 绿光和近红外波段光谱匹配相似度与红光和蓝光波段相比, 最大低幅为50%。地物光谱辐射源能够用于光学遥感器的辐射定标, 能有效解决光学遥感器的工作目标与定标光源光谱不匹配造成的定标误差。

A spectrum-tunable ground scenery spectrum radiation source, using LEDs and bromine tungsten lamp as luminescence media, was introduced. System structure and control of the spectrum radiation source was expounded in detail. In order to simulate various ground scenery spectrum distribution with different shapes, a ground scenery spectral database was established in the control system. An improved genetic algorithm was proposed, and a large number of ground scenery spectra were produced by the simulator. Spectral similarity and the average spectral matching error of several typical ground scenery spectra were further analyzed. Spectral similarity of red bands, green bands, blue bands and near-infrared spectral band also was discussed. When the radiance of the target was 50 W·(m2·sr)-1, the average spectral matching error was less than 10% and spectral similarity was greater than 0.9, up to 0.983. Spectral similarity of red band, green band, blue band and near-infrared band (especially green band and near-infrared band) was less than that of full-band.Compared with blue band and red band, spectral similarity of green band and near-infrared band low-amplitude maximum can rearch50%. Ground scenery spectrum radiation source can be used as radiometric calibration source for optical remote sensor, and calibration error, which is caused by objectives and calibration sources spectral mismatch, can be effectively reduced.