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content/notes/08-proximity sensors.md
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@ -156,14 +156,18 @@ GPS – Satellites
- At least four satellites from virtually anywhere on earth (we come back to this..) - At least four satellites from virtually anywhere on earth (we come back to this..)
- Satellites use high precision atomic clock - Satellites use high precision atomic clock
> [!INFO] constantly transmitting signal. they send the route they are flying, and where the other satelittes are flying
GPS - Signal GPS - Signal
- GPS satellite constantly transmits radio signals (L1 signal for privat, L2 military - GPS satellite constantly transmits radio signals (L1 signal for privat, L2 military
- The navigation message is made up of three major components: - The navigation message is made up of three major components:
- GPS date and time, plus the satellite's status and an indication of its health - GPS date and time, plus the satellite's status and an indication of its health
- Orbital information called ephemeris data and allows the receiver to calculate the position of the satellite (valid ~4h) - Orbital information called ephemeris data and allows the receiver to calculate the position of the satellite (valid ~4h)
- Almanac, contains information and status concerning all the satellites; their locations and PRN numbers needed to find satellites (valid ~180days) - Almanac, contains information and status concerning all the satellites; their locations and PRN numbers needed to find satellites (valid ~180days)
- Each satellite has a unique ID called “Gold codes” or PRNs (pseudo-random noise sequences) to differentiate each satellite - Each satellite has a unique ID called “Gold codes” or PRNs (pseudo-random noise sequences) to differentiate each satellite
> [!INFO] get data from four satellites, (position, time, etc).
GPS - Receiver GPS - Receiver
- Uses messages received from satellites (n≥4) to determine the satellite positions and time sent - Uses messages received from satellites (n≥4) to determine the satellite positions and time sent
- Gives roughly distance to satellite - Gives roughly distance to satellite