Fig. 1. Flowchart of band selection

Fig. 2. Flowchart of Fourier spectral data processing

Fig. 3. UAV target detection image

Fig. 4. Spectral curves of different objects. (a) UAV; (b) plastic bag

Fig. 5. SSNR curves of different objects. (a) UAV; (b) plastic bag

Fig. 6. Single-channel detection images of plastic bag carried by UAV

Fig. 7. Box detection picture

Fig. 8. Spectra and SSNR curves of box with different scan intervals. (a) 5 nm scan interval, spectral curve; (b) 5 nm scan interval, SSNR curve; (c) 10 nm scan interval, spectral curve; (d) 10 nm scan interval, SSNR curve

Fig. 9. Single-channel detection images of box

Fig. 10. Doll detection picture

Fig. 11. Spectral curve and SSNR curve of doll with 5 nm scan interval. (a) Spectral curve; (b) SSNR curve

Fig. 12. Single-channel detection images of doll