## 4 Simulation Results
The target selection and observation path of one of the conditions in the first group are shown in Figure 8. In the figure, the black circles represent the position of targets, the gray lines are the observation time windows, the blue areas are the areas where targets can be favorable targets for data transmission, and the different colored lines indicate the attitude maneuver paths and observation paths of the satellite. The paths and target points are represented with time and roll angle of the satellite instead of latitude and longitude, which can reflect the satellite observation process more intuitively. It can be seen that the available memory capacity and electrical energy are in sufficient states during the satellite observation process from Figures 9 and 10. From Figure 8, it is clear that DPH and EPH do not select targets in an observation-priority way and thus gain fewer observations, resulting in a lower objective function value \(J\). In contrast, RS selects targets according to OPH's strategy and performs more target observations, resulting in a higher objective function value \(J\). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Parameter Name** & **Group 1** & **Group 2** & **Group 3** \\ \hline Initial Electrical energy \(W_{initial}\) & \(2\times 10^{6}\) J & \(2\times 10^{6}\) J & \(2\times 10^{5}\) J \\ Memory Capacity \(M_{\max}\) & 1200 Gbit & 1200 Gbit & 1200 Gbit \\ Target Number \(n_{t}\) & 55 & 60 & 55 \\ Target Distribution Area Number & 2 & 3 & 2 \\ Target Number in Each Area & 15; 40 & 25; 15; 20 & 15; 40 \\ Sub-satellite Point Phase Range of & [9.3, 62.1]: & [12.4, 55.9]: & [62.1, 124.1]: \\ Target Distribution (\({}^{\circ}\)) & [9.3, 62.1] & [62.1, 99.3] & [62.1, 124.1] \\ Angle Range between Targets and & [\(-0.5\), 0.5]: & [\(-5.1\), \(-2.1\)]: & [\(-0.5\), 0.5]: \\ Orbital Plane (\({}^{\circ}\)) & [4.2, 6.2] & [2.1, 5.1]: & [4.2, 6.2] \\  & & [0, 2.1] & \\ Max Target Value \(v_{\max}\) & 1 & 1 & 1 \\ Min Target Value \(v_{\min}\) & 0.9 & 0.9 & 0.9 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Condition parameters. The target selection and observation path of a single condition in the second group are shown in Figure 11. Note that Figures 12 and 13 show that the available memory capacity and electrical energy were sufficient during the satellite observation process. As can be seen in Figure 11, DPH, TS, and RS selected favorable targets for data transmission, so they obtained more data transmission time windows. In Figure 14, the red strips are the observation periods, the yellow strips are the data download periods, and the blue strips are the data transmission time windows. It is apparent that DPH, RS, and TS obtained more data transmission time windows than the other methods. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Group 1**} & \multicolumn{3}{c}{**Group 2**} & \multicolumn{3}{c}{**Group 3**} \\ \cline{2-10}
**Method** & **Max** & **Min** & **Avg** & **Max** & **Min** & **Avg** & **Max** & **Min** & **Avg** \\ \hline OPH [34; 35] & 31.13 & 26.52 & 28.30 & 33.85 & 29.35 & 31.07 & 10.67 & 9.67 & 9.91 \\ EPH & 27.63 & 22.75 & 25.85 & 35.90 & 33.62 & 34.70 & 10.67 & 9.67 & 9.82 \\ DPH & 22.67 & 19.68 & 21.64 & 30.35 & 26.17 & 28.36 & 14.12 & 11.24 & 12.30 \\ TS [36; 37] & 31.23 & 27.48 & 29.40 & 36.90 & 34.00 & 35.26 & 14.23 & 12.56 & 13.35 \\ RS & 31.13 & 26.52 & 28.30 & 35.90 & 33.62 & 34.70 & 14.12 & 11.24 & 12.30 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Resulting values of different methods. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Conditions** & **OPH** [34; 35] & **DPH** & **EPH** & **TS** [36; 37] & **RS** \\ \hline Group 1 (s) & 10.21 & 9.41 & 8.05 & 854.23 & 10.21 \\ Group 2 (s) & 15.62 & 12.1 & 15.08 & 3243.05 & 12.06 \\ Group 3 (s) & 12.96 & 12.97 & 12.82 & 6896.81 & 12.83 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: The average calculation time of different methods in different groups. Figure 7: Comparison results of different methods. data transmission time windows.