FreeFlight Systems

Avionics Systems for Drones & UAVs: SBAS/GNSS Receivers, Radar Altimeters

FreeFlight Systems
Avionics Systems for Drones & UAVs: SBAS/GNSS Receivers, Radar Altimeters
8080 Tristar Dr, Suite 100 Irving, TX 75063 Regional offices

FreeFlight Systems is a leading provider of UAV (unmanned aerial vehicle) and drone avionics systems and solutions.

Our next-generation products, developed with over 50 years of aviation expertise, are designed to be future-proof and are used worldwide to enhance the safety, efficiency and affordability of unmanned flight.

UAV Avionics equipment

Our modular and scalable products can be easily integrated into a wide variety of fixed-wing and rotary UAVs, serving a range of commercial, government and military requirements.

1201 Series SBAS/GNSS Receivers

High-accuracy GNSS positioning for UAVs

SBAS GNSS receiverThe 1201 Constellation Series is designed to provide robust, highly reliable GPS position data for ADS-B, IFF Mode 5 and other UAV detect-and-avoid and identification systems.

Ideal for urban air mobility (UAM) applications, the lightweight sensors can be integrated into a variety of OEM drone platforms or retrofitted to existing aircraft.

Drone Avionics Solutions

The standalone unit processes GPS signal data, and Satellite Based Augmentation System (SBAS) signal data where available, that is compliant with the Wide Area Augmentation System (WAAS) standard used in the United States. It provides high-accuracy position, velocity, time, and integrity (PVT&I) data that is crucial for precise UAV navigation applications.

sbas receiver for gnss positioning

Rated for use in harsh environments, the rugged, low-SWaP (size, weight and power) unit interfaces to TAWS (Terrain Awareness Warning Systems), FMS (Flight Management Systems), NMS (Navigation Management Systems), and other systems requiring GPS data via an ARINC 743 2-wire interface, and meets all standards for a TSO-C145c Class Beta 1 device.


Dimensions (W x D x H) 127 x 139.7 x 43.2 mm
(5.0 x 5.5 x 1.7 in)
Weight 476.27 g
(1.05 lb)
Power Requirements 18 knots
Maximum Depth Detection 10-40 VDC
Typical 0.34A @ 28 VDC
Peak 0.84A @ 28 VDC
Transmitter Power 40W max
Max Altitude 50,000 ft
Operating Temperature -40°C to 70°C
(-40°F to 158°F)

UAV Radar Altimeters

Altitude measurement for safety-critical unmanned aircraft applications

Drone radar altimeterOur UAV radar altimeters provide high-reliability measurements of altitude above terrain for critical drone navigation and safety applications.

Designed with state-of-the-art DSP-based RF electronics, the robust units have been engineered to eliminate spurious terrestrial datalink spectrum interference, including 5G.

Featuring rugged enclosures designed for use in mission-critical and military-grade environments, the radar altimeters can be easily retrofitted into existing unmanned aircraft. They can be interfaced with our RAD-40 and RAD-45 LED display indicators, or with a variety of popular glass displays and legacy analog indicators.UAV Radar altimeters

All models feature RS 485/422, RS-232 and ARINC 429, with some additionally supporting Ethernet connectivity and USB On the Go (OTG).

Our drone radar altimeters are available in four different models:

  • RA-5500 – for general fixed-wing UAS and FAA Part 27 Airworthiness Standards requirements
  • RA-6500 – for heavy rotary-wing UAS platforms
  • RA-7500 – for military and government unmanned aircraft
  • RA-4500 – designed as a replacement for legacy altimeters


5500 radar altimeterRA-5500 RA-6500 radar altimeterRA-6500 ra-7500 radar altimeterRA-7500 ra-4500 radar altimeterRA-4500
(W x D x H)
77.7 x 172.2 x 80.0 mm
(3.06 x 6.78 x 3.15 in)
Weight 862g
(1.90 lbs)
Power Requirements 400 mA max @ 28VDC
Power Output 100 mW nominal
Update Rate Min 25 Hz
Altitude Accuracy 0 to 100 ft: ≤ ±3 feet
100 to 500 ft: ≤ 3%
500 to 2500 ft: ≤ 5%
0 to 100 ft: ≤ 3%
100 to 500 ft: ≤ 3%
500 to 2500 ft: ≤ 5%
Altitude Range -20 to 2,500 ft.
Service Ceiling 50,000 ft.
Certifications TSO-C87
DO-178 DAL C
DO-178C Level B
DO-178 DAL B
DO-178B Level C

More information: UAV Radar Altimeters

Regional Offices & Locations
FreeFlight Systems 8080 Tristar Dr, Suite 100 Irving, TX 75063 +1.254.662.0000 Contact Send Message Website