From 6a84697ab5a2aa9e685cf6b73ee876dabc099258 Mon Sep 17 00:00:00 2001 From: Jet Hughes Date: Thu, 23 Mar 2023 10:57:22 +1300 Subject: [PATCH] vault backup: 2023-03-23 10:57:22 --- content/notes/08-proximity sensors.md | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/content/notes/08-proximity sensors.md b/content/notes/08-proximity sensors.md index 40d8dc930..cecb0b639 100644 --- a/content/notes/08-proximity sensors.md +++ b/content/notes/08-proximity sensors.md @@ -156,14 +156,18 @@ GPS – Satellites - At least four satellites from virtually anywhere on earth (we come back to this..) - 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 satellite constantly transmits radio signals (L1 signal for privat, L2 military - 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 -- 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) + - 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) + - 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 +> [!INFO] get data from four satellites, (position, time, etc). + GPS - Receiver - Uses messages received from satellites (n≥4) to determine the satellite positions and time sent - Gives roughly distance to satellite