Fig.1

Theoretical flowchart of pixel interpolation image based on variance fitting"

Fig.2

Schematic diagram of variance prediction for an image with azimuth angle at 4° using Lagrange interpolating method"

Fig.3

Flow diagram of wavelet transform part processing method"

Fig.4

Schematic diagram of composite model between large ship and rough sea surface"

Fig.5

Interpolated results of two interpolation methods under level-3 sea state"

Fig.6

Evaluation metric results for simulated SAR image dataset under level-3 sea state with 5° intervals"

Fig.7

Evaluation metric results for simulated SAR image dataset under level-3 sea state with 10° intervals"

Fig.8

Evaluation metric results for simulated SAR image dataset under level-3 sea state with 15° intervals"

Fig.9

Interpolation results of the simulated SAR image datasets with different azimuthal intervals selected for three different sea conditions"

Fig.10

Interpolated evaluation index results under level-3 sea state"

Fig.11

Interpolated evaluation index results under level-4 sea state"

Fig.12

Interpolated evaluation index results under level-5 sea state"

Fig.13

Comparison diagram between simulated images and interpolated images under level-3 sea state"

Table 1

Summary of average values of azimuth interpolation under different conditions with 1.5 GHz fixed frequency and 45° pitch angle"

Fig.14

Comparison diagram between simulated images and interpolated images under level-4 sea state"

Fig.15

Comparison diagram between simulated images and interpolated images under level-5 sea state"