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content/notes/09-location-sensors-3.md
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@ -32,6 +32,8 @@ Urban Canyon
![Urban canyon](https://i.imgur.com/1aKMSLg.png)
> [!INFO] buildings block some satellites
> reflected signals take more time to arrive and disrupt accuracy
> also happens with lower building that are closer together
> happens also with trees
GPS - Problems
@ -45,8 +47,10 @@ GPS - Problems
- “Very large errors are uncommon and rarely exceed 30m”
- Long startup time ( 30s - 12.5min needed for sending almanac)
- Several proposed improvements: AGPS, DGPS, RTKGPS
> [!INFO] ^Depends on many parameters
> bad weather also affects travel time hence accuracy
> long start up time. almanac (satellite position and future positions) is a large amount of data that each device needs to recieve
> with data/wifi can download almanac from phone provider
# Location Sensors - AGPS, DGPS, RTK GPS
@ -61,8 +65,9 @@ A(ssisted) GPS
- Higher precision (with WiFi Positioning & cell-site multilateration)
- Disadvantages:
- Requires Internet connection
![A(ssisted) GPS](https://i.imgur.com/u7iLeWG.png)
> [!INFO] most relevant to us. used in mobile phones. trad gps uses only satellite. AGPS used that and network information
> also incorporates wifi and cell location
D(ifferential) GPS
- Enhancement to GPS to increase location accuracy and integrity