Bengaluru-based drone startup Aarav Unmanned Systems (AUS) has raised an undisclosed amount in a Pre-Series A funding round from GrowX Ventures, 500 Startups, and BellWether Advisors. The round also saw the participation of existing investors StartupXseed, 3ONE4 Capital and Sanjay Jesrani. Founded in 2013, the startup develops its own commercial-grade drones.