Terminology
| Term | Definition |
|---|---|
| USV | Unmanned Surface Vessel — a remotely or autonomously operated watercraft |
| SBES | Single-Beam Echo Sounder — a sonar device that measures water depth along a single vertical beam |
| RTK | Real-Time Kinematic — centimetre-level differential GNSS positioning using a base station or CORS network |
| TAP | Tersus Accurate Positioning — satellite-based PPP correction service providing centimetre-level positioning without a local base station |
| PPP | Precise Point Positioning — GNSS positioning technique using precise satellite clock and orbit corrections |
| CORS | Continuously Operating Reference Station — a fixed GNSS reference station providing RTK corrections |
| TSL3 | Tersus sonar log file format recorded by the ES200 echo sounder |
| Draft | Vertical distance from the water surface to the face of the echo sounder transducer |
| Sound Speed | Speed of acoustic waves through water, used to convert echo travel time to depth (typical: ~1500 m/s) |
| Bathymetry | The measurement of water depth to map the underwater topography of a water body |
| Lawnmower Pattern | A systematic survey pattern of parallel lines used to provide full coverage of a survey area |
| Geofence | A virtual boundary defined in the mission planning software; the USV will not cross this boundary |
| Arm / Disarm | Arming enables the propellers; disarming cuts power to the propellers |
| Hold Mode | USV operating mode in which the vessel maintains its current position using GPS |
| Fast Return | USV operating mode in which the vessel returns directly to the launch point |
| XT90S | A high-current anti-spark battery connector standard used on the USV battery |
| MR60-3P | Battery charging connector on the USV battery pack |
| FOV | Field of View — the angular extent visible to the camera |
Support: support@tersus-gnss.com