Control Links (C2)
The command-and-control link sends pilot inputs to the drone. ExpressLRS/Crossfire for short-range (5-50km); Microhard/Doodle Labs for long-range BVLOS (50-200km); satellite (Iridium) for global. Redundant C2 links (dual frequency) are required for BVLOS approval in most jurisdictions.
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Video Downlinks
Analog 5.8GHz for FPV (low latency, short range); digital HD (DJI O3/Walksnail) for pilot camera; COFDM (Doodle Labs, Silvus) for BVLOS enterprise (20-50km, obstacle penetration); 4G/5G cellular for unlimited range (latency dependent on network).
Telemetry Protocols
MAVLink is the standard telemetry protocol for PX4/ArduPilot — transmits position, battery, status, and waypoint data. FrSky SmartPort and CRSF telemetry for FPV. For BVLOS, use encrypted MAVLink (MAVLink 2 signing) over redundant links with frequency hopping.
Antenna Tracking Systems
For long-range operations, ground station antenna trackers automatically point high-gain directional antennas at the drone using GPS telemetry. This extends range from 5km (omni) to 50-200km (tracked patch/helical). Dual-axis trackers with diversity are standard for BVLOS.
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