## 6 Experimental Verification and Analysis
### Simulation Scenario Construction  
This section utilizes STK software to construct a BDS-3 ISL scenario. The orbital data for the simulation are sourced from the BeiDou satellite TLE orbital files available on the Celestrak website ([[https://celestrak.org/NORAD/elements/](https://celestrak.org/NORAD/elements/)]([https://celestrak.org/NORAD/elements/](https://celestrak.org/NORAD/elements/)) (accessed on 1 November 2024)). The total simulation time range spans from UTCG 27 November 2024 04:00:00 to UTCG 1 December 2024 04:00:00.  
The experiment selects MEO-19 as the first satellite in the first orbital plane of the MEO constellation (MEO\({}_{11}\)). At a given moment, when MEO\({}_{11}\) passes the Right Ascension of the Ascending Node (RAAN), the satellite in the second orbital plane that reaches RAAN after 1/24 of the orbital period is defined as MEO\({}_{21}\). Similarly, after another 1/24 period, the satellite in the third orbital plane reaching RAAN is defined as MEO\({}_{31}\). This sequential logic is applied to assign identifiers to all satellites in the MEO constellation. The GEO and IGSO satellites are sequentially numbered from GEO\({}_{1}\) to GEO\({}_{3}\) and IGSO\({}_{1}\) to IGSO\({}_{3}\), respectively, in ascending order of their RAAN. The corresponding parameters for the BDS-3 are provided in Table 6.  
Figures 7 and 8 display the 3D and 2D simulation scenarios of the BDS-3 constellation constructed based on STK software, respectively. The subsequent inter-satellite topology characterization and link budget analysis will be conducted within this established simulation scenario.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Satellite ID** & **Satellite Type** & **PRN** & **Launch Time** \\ \hline MEO\({}_{11}\) & MEO-19 & C41 & 16 December 2019 \\ MEO\({}_{12}\) & MEO-13 & C32 & 19 September 2018 \\ MEO\({}_{13}\) & MEO-02 & C20 & 5 November 2017 \\ MEO\({}_{14}\) & MEO-01 & C19 & 5 November 2017 \\ MEO\({}_{15}\) & MEO-04 & C22 & 12 February 2018 \\ MEO\({}_{16}\) & MEO-03 & C21 & 12 February 2018 \\ MEO\({}_{17}\) & MEO-20 & C42 & 16 December 2019 \\ MEO\({}_{18}\) & MEO-14 & C33 & 19 September 2018 \\ MEO\({}_{21}\) & MEO-06 & C24 & 29 July 2018 \\ MEO\({}_{22}\) & MEO-11 & C25 & 24 August 2018 \\ MEO\({}_{23}\) & MEO-05 & C23 & 29 July 2018 \\ MEO\({}_{24}\) & MEO-18 & C37 & 18 November 2018 \\ MEO\({}_{25}\) & MEO-24 & C46 & 22 September 2019 \\ MEO\({}_{26}\) & MEO-17 & C36 & 18 November 2018 \\ MEO\({}_{27}\) & MEO-23 & C45 & 22 September 2019 \\ MEO\({}_{28}\) & MEO-12 & C26 & 24 August 2018 \\ MEO\({}_{31}\) & MEO-16 & C35 & 15 October 2018 \\ MEO\({}_{32}\) & MEO-22 & C44 & 23 November 2019 \\ MEO\({}_{33}\) & MEO-15 & C34 & 15 October 2018 \\ MEO\({}_{34}\) & MEO-21 & C43 & 23 November 2019 \\ MEO\({}_{35}\) & MEO-08 & C28 & 11 January 2018 \\ MEO\({}_{36}\) & MEO-07 & C27 & 11 January 2018 \\ MEO\({}_{37}\) & MEO-10 & C30 & 29 March 2018 \\ MEO\({}_{38}\) & MEO-09 & C29 & 29 March 2018 \\ GEO\({}_{1}\) & GEO-02 & C60 & 29 March 2020 \\ GEO\({}_{2}\) & GEO-03 & C61 & 23 June 2020 \\ GEO\({}_{3}\) & GEO-01 & C59 & 1 November 2018 \\ IGSO\({}_{1}\) & IGSO-01 & C38 & 20 April 2019 \\ IGSO\({}_{2}\) & IGSO-02 & C39 & 24 June 2019 \\ IGSO\({}_{3}\) & IGSO-03 & C40 & 5 November 2019 \\ \hline \hline \end{tabular}
\end{table}
Table 6: The corresponding parameters for the BDS-3.  
Figure 7: 3D simulation scenarios of the BDS-3 constellation.