What is it about?
Solar-powered fixed-wing autonomous aerial vehicles could remain airborne for long periods while providing wireless backhaul to ground networks. However, their altitude creates an important energy trade-off. Higher altitudes can improve solar-energy harvesting and reduce propulsion requirements because of lower air density, while lower altitudes may be preferable for communication and operational reasons. We formulate this as an altitude-optimization problem and determine the minimum altitude at which the solar energy harvested by the aircraft balances its energy consumption, allowing sustainable operation without depleting its battery. A closed-form expression is derived for this optimum altitude.
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Why is it important?
Operating higher than necessary is not always desirable. Lower-altitude operation can shorten communication distances and is particularly valuable for time-sensitive missions where rapid response or closer proximity to the ground is required. The key question is therefore: how low can the aircraft safely operate while remaining energy self-sustainable? The proposed expression answers this directly and reveals how the answer changes with geographical location, season, aircraft mass, and solar-panel efficiency. The analytical solution was also shown to be very accurate: in three investigated scenarios, its predicted optimal altitude differed from numerical optimization by only about 1.6 to 10 metres.
Perspectives
The work provides a practical connection between aircraft energy management and communication-network deployment. Instead of selecting flight altitude independently of energy considerations, network designers can determine the lowest sustainable operating point for the actual aircraft, location, and time of year. The results also highlight that there is no universal sustainable altitude: heavier aircraft generally require higher operation, and the required altitude can increase substantially toward winter. Such altitude-aware energy planning can help enable longer-duration airborne communication platforms while avoiding unnecessary increases in operating height.
Assist. Prof. Mohammed Elamassie
Ozyegin Universitesi
Read the Original
This page is a summary of: Minimum Operation Altitude for Self-Sustainable Operation of Solar-Powered Fixed-Wing AAVs in Airborne Networks, IEEE Open Journal of the Communications Society, January 2025, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/ojcoms.2024.3519714.
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