Navigation and Positioning

What it is

UAS navigation typically fuses GNSS positioning with inertial and other onboard sensors to determine location, heading and altitude. Each input has its own failure modes, from environmental interference to sensor drift.

Why it matters

Subtly wrong position data is more dangerous than obviously missing data, because a subtly wrong signal can be trusted and acted on before anyone notices something is off. Navigation integrity failures can affect both mission success and safe operation.

Affected components

The GNSS receiver, the inertial and sensor-fusion stack, and the navigation fallback logic that decides what happens when confidence drops are all part of this picture — along with the ground-control display that ultimately presents position to a human operator.

Defender questions

Teams should be able to answer how they would detect subtly incorrect positioning data rather than an outright loss of signal, what their platform’s automated behavior is when GNSS confidence drops, and whether position is cross-checked against independent sensor sources rather than trusted from a single feed.

Detection ideas

Comparing GNSS-derived position against inertial dead-reckoning estimates, watching for physically implausible movement, and tracking GNSS confidence metrics over time can all surface anomalies before they become operationally significant.

Mitigation themes

Multi-sensor cross-validation, confidence-aware fallback and safe-landing behavior, and logging detailed enough to reconstruct what happened after the fact are the core resilience investments for navigation integrity.

Practice this in a mission

Contested Navigation and Navigation Integrity turn this topic into hands-on missions with realistic, simulated telemetry.