高光谱遥感器现场光谱定标精度验证方法研究

Verification method of spectral calibration accuracy for hyperspectral remote sensors

鉴于精确的光谱辐射定标精度验证对于高光谱遥感器的现场定标和数据应用非常必要,以SVC光谱辐亮度计为例,利用多波段辐亮度标准传递探测器和新型的光谱可调积分球参考光源,设计了一种高光谱遥感器光谱定标精度的验证方法。该方法利用新型光谱可调积分球参考光源在待测波段内分别输出光谱形状单调上升和单调下降的光谱辐亮度状态,通过光谱匹配技术,即平移改变SVC光谱辐亮度计的波长,分析比对MRSTD和SVC光谱辐亮度计测量辐亮度的相对偏差。比对结果为光谱定标验证精度优于±0.2nm,辐射定标验证精度小于5%。

Validation for radiometric and spectral calibration accuracy of hyperspectral remote sensor is necessary. Taking SVC spectral radiometer as an example, new type spectrum-tunable reference light source （STIS） and muti-band radiance standard transfer detector（MRSTD） are used to design validation method for radiometric and spectral calibration accuracy. In this meth- od, spectral level of spectral shape is monotonically increasing and monotonically decreasing in measured band by new spectral adjustable integrating sphere reference light source. Wavelength of SVC spectral radiance is changed by spectral matching technique. Relative deviation of radi- ance measured by MRSTD and SVC spectral radiometer are calculated and contrasted. Contrast shows that spectral calibration accuracy is better than ±0.2 nm, and absolute radiometric cali- bration accuracy is less than 5 %.