Uncrewed Systems

Miniature GNSS-denied navigation for uncrewed platforms

A micro-miniature inertial navigation system, about 38 g and under 1.5 W, that keeps UAVs, UGVs and uncrewed surface vehicles navigating through GNSS outages.

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The challenge

An uncrewed platform that relies on GNSS alone loses its position when the signal goes: in tunnels, in urban canyons and in zones of interference or jamming.

Drones and small robots have little room, weight or power to spare. The navigation system has to be small, light and frugal as well as accurate.

How we solve it

Pollux 3 is a micro-miniature MEMS inertial navigation system. It combines tri-axial accelerometers, gyroscopes and a magnetometer with an integrated multi-constellation GNSS receiver, and an Extended Kalman Filter turns them into position, velocity, attitude and heading at 200 Hz.

Small size, weight and power
37 x 37 x 15 mm, about 38 g, and under 1.5 W from a 5 V supply.
Keeps navigating without GNSS
DriftLoc minimises inertial drift when satellites vanish, holding position and true heading. With external aiding, position error is 2% of distance travelled (1σ) in 2D, and 3% in 3D with airspeed aiding.
Detects jamming and spoofing
The built-in GNSS receiver tracks GPS, GLONASS, Galileo, BeiDou and NavIC, and detects jamming and spoofing.
Plugs into the autopilot
RS232 and UART outputs in NMEA 0183 or binary, plus SPI and I2C inputs for airspeed and magnetometer aiding, for easy integration with autopilots such as ArduPilot and with controllers.
On uncrewed surface vehicles
Pollux 3 serves uncrewed surface vehicles too, sealed to IP65 against water spray and rain. Where heading is needed from the outset, Octantis 3 adds dual-antenna GNSS compassing.