Relay Positioning Strategy for Traffic Data Collection of Multiple Unmanned Aerial Vehicles Using Hybrid Optimization Systems: A FANET-Based Case Study

Table 2

Main topology features.

GRNN
Spread	0.3
Number of inputs	8
Number of outputs	3
Number of examples (training)	12402
Number of samples (validation)	50
Number of UAVs	3
Number of relays	1
Bat algorithm
Population size	40
Number of generations	1000
Sound	0.5
Pulse rate	0.7
Frequency	[0–2]