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由整星混合光谱反演卫星特征的核心在于数理模型及反演算法,基于此建立了光谱混合数理模型并进行了实验验证。首先,对部件光谱散射模型、线性光谱混合模型、整星光谱解混方法进行了理论分析;然后,设计实验定标测量了高保真GEO卫星模型及部件的光谱BRDF特性,讨论了部件和材料光谱散射特性的差别;最后,采用非负约束最小二乘法对卫星整体光谱进行了解混分析,最大相对残差小于10%。实验结果表明,线性光谱混合模型及非负约束最小二乘解混方法对于描述卫星光谱混合机理、反演卫星状态具有一定实用意义。
The core of the satellite features inversion by the omnidirectional hybrid spectrum lies in the mathematical model and the inversion algorithm. Based on this, a spectral hybrid mathematical model is established and verified by experiments. First of all, theoretical analysis is made on the components spectral scattering model, the linear spectral mixing model and the satellite spectrum unmixing method. Then, the BRDF characteristics of the high-fidelity GEO satellite model and its components are measured and calibrated by design experiments. The components and material spectra Scattering characteristics; Finally, the non-negative constrained least-squares method is used to analyze the overall spectrum of the satellite, the maximum relative residual error is less than 10%. The experimental results show that the linear spectral mixing model and the nonnegative constrained least squares unmixing method are of practical significance for describing the satellite spectral mixing mechanism and inverting the satellite state.