Fig. 1. CCD point damage, line damage, full target damage imaging images

Fig. 2. Change curve of cat eye echo power and degree of polarization under different CCD damage states

Fig. 3. Microscopic images (a)-(c) and contour images (d)-(e) of damage sites under different damage states

Fig. 4. Relation curves between the polarization degree of echo scattering and the surface roughness of target for cat’s eye of different materials

Fig. 5. Cat eye echo power (a) and degree of polarization (b) vary with the number of pulses

Fig. 6. Surface morphology of different damage sites