## 4 Experiment of Geometry Processing Accuracy Evaluation
### Geometric Calibration Results  
The calibration is performed, respectively, on the scenes in Table 2. For example, Figure 10 shows the range and azimuth deviations of all corner reflectors in Incalib Image \begin{table}
\begin{tabular}{c c c c c} \hline \hline \begin{tabular}{c} **Pulse-Width and** \\ **Bandwidth Combination** \\ **ID** \\ \end{tabular} & \begin{tabular}{c} **Incalib Image** \\ **ID** \\ \end{tabular} & \begin{tabular}{c} **Central** \\ **Side-Looking** \\ **Angle** \\ \end{tabular} & \
\begin{tabular}{c} **Orbit** \\ **Side** \\ \end{tabular} &
\begin{tabular}{c} **Looking** \\ **Side** \\ \end{tabular} \\ \hline \multirow{4}{*}{B1} & Image 1 & 50.27 & Ascend & Right \\  & Image 2 & 47.93 & Desend & Left \\  & Image 3 & 47.43 & Desend & Left \\  & Image 4 & 28.44 & Desend & Left \\  & Image 5 & 54.92 & Desend & Left \\  & Image 6 & 52.11 & Ascend & Right \\  & Image 7 & 53.21 & Desend & Left \\  & Image 8 & 53.21 & Ascend & Left \\  & Image 9 & 44.96 & Ascend & Left \\  & Image 10 & 50.7 & Ascend & Right \\  & Image 11 & 58.86 & Ascend & Right \\  & Image 12 & 39.37 & Ascend & Left \\  & Image 13 & 23.62 & Ascend & Right \\  & Image 14 & 18.33 & Desend & Right \\  & Image 15 & 31.39 & Ascend & Right \\  & Image 16 & 29.44 & Ascend & Left \\  & Image 17 & 23.62 & Ascend & Left \\  & Image 18 & 57.2 & Desend & Left \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Incalib image information. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \begin{tabular}{c} **Pulse-Width and** \\ **Bandwidth Combination** \\ **ID** \\ \end{tabular} & \begin{tabular}{c} **Test Image ID** \\ \end{tabular} & \begin{tabular}{c} **Central** \\ **Side-Looking** \\ **Angle** \\ \end{tabular} & \
\begin{tabular}{c} **Orbit** \\ **Side** \\ \end{tabular} &
\begin{tabular}{c} **Looking** \\ **Side** \\ \end{tabular} \\ \hline \multirow{4}{*}{B1} & Image 1 & 48.43 & Desend & Left \\  & Image 2 & 48.18 & Desend & Right \\  & Image 3 & 51.72 & Ascend & Left \\  & Image 4 & 28.94 & Ascend & Left \\  & Image 5 & 28.94 & Ascend & Left \\  & Image 5 & 28.94 & Desend & Right \\  & Image 6 & 21.32 & Ascend & Right \\  & Image 7 & 50.7 & Ascend & Left \\  & Image 8 & 49.14 & Ascend & Left \\  & Image 9 & 34.99 & Ascend & Left \\  & Image 10 & 34.56 & Desend & Right \\  & Image 11 & 42.16 & Ascend & Left \\  & Image 12 & 29.94 & Desend & Left \\  & Image 13 & 25.27 & Ascend & Left \\  & Image 14 & 19.54 & Desend & Right \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Test image information. \(11\) and Incalib Image 17 after the compensation of other errors including the atmosphere delay, platform position error, and elevation error. The circles in the figure represent the position of the calibration corner reflectors within the image scene, every red line represents the range deviation of each reflector, the blue line represents its azimuth deviation, and the length of the line represents the deviation amount. It can be seen that the value and direction of the range deviations are consistent among different corner reflectors. However, the azimuth deviation is very small, almost negligible for some scenes. We calculate the medium error of the deviations of all corner reflectors in each scene, then obtain the range meter and azimuth time correction values as the range and azimuth calibration value of this scene. Figures 11 and 12 show the calibration values of the 18 images in Table 2. Different combination groups (B1-B6) are distinguished by different colors. Among them, the three groups B2, B4, and B6 have only one calibration image, and the three groups B1, B3, and B5 correspond to multiple images. From Figure 10 we can see that the slant range calibration values within each group B1, B3, and B5 are not stable and constant, there are random errors.