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content/notes/09-location-sensors-3.md
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@ -19,6 +19,8 @@ GPS - Receiver
- Buildings reflect and occlude satellite signals - Buildings reflect and occlude satellite signals
- Reducing precision of positioning in urban environments - Reducing precision of positioning in urban environments
- Makes positioning impossible - Makes positioning impossible
> [!INFO] Add a fourth satellite so we can find the clock bias
> there are timer networks where you can get time from an atomic clock (still not accurate but better)
Urban Canyon Urban Canyon
- Urban environment similar to a natural canyon - Urban environment similar to a natural canyon
@ -28,6 +30,9 @@ Urban Canyon
- Makes positioning impossible www.hci.otago.ac.nz The end! - Makes positioning impossible www.hci.otago.ac.nz The end!
![Urban canyon](https://i.imgur.com/WgWREXs.png) ![Urban canyon](https://i.imgur.com/WgWREXs.png)
![Urban canyon](https://i.imgur.com/1aKMSLg.png) ![Urban canyon](https://i.imgur.com/1aKMSLg.png)
> [!INFO] buildings block some satellites
> reflected signals take more time to arrive and disrupt accuracy
GPS - Problems GPS - Problems
- Urban environment similar to a natural canyon - Urban environment similar to a natural canyon
@ -59,7 +64,6 @@ A(ssisted) GPS
![A(ssisted) GPS](https://i.imgur.com/u7iLeWG.png) ![A(ssisted) GPS](https://i.imgur.com/u7iLeWG.png)
D(ifferential) GPS D(ifferential) GPS
- Enhancement to GPS to increase location accuracy and integrity - Enhancement to GPS to increase location accuracy and integrity
- DGPS correct errors using a stationary receiver station with a known location - DGPS correct errors using a stationary receiver station with a known location