ti_mo
1.7 KiB
Lab 5 - Wireless Networking Technologies
Analyzing a LEO Satellite Pass
by Timo Niemann
Task1
1.1
See code lab_5.m and create_satellite_sim.m, where the first file defines all parameters for the simulation and the create_satellite_sim function creates and returns the satellite and ground station.
1.2
To calculate the distance to the satellite, the MATLAB access analysis example was used as a basis and modified. The distance is calculated with the aer function, which returns azimuth, elevation, and slant range between the ground station and the satellite. To avoid invalid channel simulations, the signal-based estimation step is skipped when the Doppler shift fshift is non-finite.
The first satellite flyby occurs at around 08:05:30. During the pass, the distance first decreases as the satellite approaches the ground station and then increases again after the closest approach. Around 08:53:30 to 08:54:00, the distance reaches a maximum because the satellite is on the far side of its orbit relative to the ground station. The second pass occurs at around 09:42. Its minimum distance is larger than during the first pass because Earth's rotation changes the relative position of the ground station below the satellite orbit.
1.3
As in the distance plot, the elevation angle reaches its highest value during the first pass. The second pass has a lower maximum elevation because Earth's rotation shifts the ground station relative to the satellite ground track.