Fig. 1. Schematic diagrams of optical telescope (a) and terminal box (b)

Fig. 2. Hyperspectral images of a space object at different wavelengths

Fig. 3. The brightness of space object varying with wavelength

Fig. 4. The basic architecture diagram of DBSCAN

Fig. 5. The basic flow chart of generative adversarial network

Fig. 5. The original and generated spectra of a space object

Fig. 6. The basic flow chart of one dimensional CNN

Fig. 7. The basic flow chart of experimental algorithm

Fig. 8. Comparisons of average operation time and accuracy among various methods

Fig. 9. Accuracies of four combination methods

Fig. 9. Average operation time of four combination methods