LIVE DEMO
Particle filter playground
Switch GPS off and watch a filter keep track of a vehicle over simulated terrain.
RESEARCH & DEMOS
From the lab
Interactive demos and publications on navigation without GPS. Free to use and share.
INTERACTIVE
Demos you can play with
LIVE DEMO
Sky polarisation explorer
See how the sky’s polarisation pattern moves with the sun, and how it gives a heading.
LIVE DEMO
Dead-reckoning drift
Add sensor bias and noise and watch position error grow.
LIVE DEMO
How far does a jammer reach?
See when a receiver loses lock as a jammer gets closer.
LIVE DEMO
Spot the spoof
Watch a position get dragged away, and which checks catch it.
LIVE DEMO
How long can your clock hold?
See how long a clock stays on time once GNSS is gone.
Contains OS data © Crown copyright and database right 2026
FIGURES
Explainer figures
FIGURE
GNSS constellations
Four systems in medium Earth orbit, and why more satellites help.
FIGURE
Fibre-optic gyroscope
The Sagnac effect: rotation measured as a phase shift in light.
FIGURE
MEMS accelerometer
A proof mass on folded springs, read out by capacitance.