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content/notes/09-location-sensors-3.md
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@ -77,6 +77,7 @@ D(ifferential) GPS
- Standalone GPS provides ~15m accuracy
- DGPS can provide ~3-5m (and max. 10-15cm) accuracy
![D(ifferential) GPS](https://i.imgur.com/WCH4dJk.png)
> [!INFO] a lot of towers around farming areas
- Various DGPS networks implemented worldwide
- iBase VRS (New Zealand) (see also Trimble)
@ -84,4 +85,11 @@ D(ifferential) GPS
- http://www.geosystems.co.nz/solutions/ ibase-vrs/
![nz iBASE VRS](https://i.imgur.com/0yv7rWC.png)
Real Time Kinematic (RTK)
- Technique to enhance location precision of satellite-based navigation systems
- Provides centimetre-level accuracy (approx. 5cm)
- Similar to DGPS, as RTK GPS also uses a base station with a stationary known location
- Uses measurements of phase of the signal carrier wave (whereas GPS only uses signal content information)
- L1 receiver measures only L1 signal (19cm)
> [!INFO] built on top of DGPS
> assumes you use diff GPS with custom rover which is close to you