Fig. 1. CPU-GPU parallelism.

Fig. 2. Multi-GPU parallel framework.

Fig. 3. Scaled ship on sea and its radar cross section comparison results: (a) model of scaled ship on sea, (b) vertical-vertical, and (c) horizontal-horizontal.

Fig. 4. A fleet of cargo ships.

Fig. 5. RCS results at pitch angles and sea scenes: (a) 400 m×400 m sea and (b) 800 m×800 m sea.

Fig. 6. Comparison of ship imaging at different sea states and angles: (a) calm sea with a grazing angle of 40°, (b) calm sea with a grazing angle of 20°, (c) level 1 sea with a grazing angle of 40°, (d) level 1 sea with a grazing angle of 20°, (e) level 2 sea with a grazing angle of 40°, and (f) level 2 sea with a grazing angle of 20°.

Table 1. Time consumptions at different sea scenes.

Table 2. Basic parameters of radar imaging.

Table 3. Averaged PSNRs at different sea states.