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Why does GPS positioning require four satellites? But a gps receiver uses the time it takes to receive a sattelite signal to determine the distance to that satellite Even minor errors in the time of your gps receiver will cause huge errors and therefore a large uncertainty band when you have only three satellites
What data is sent from GPS satellites to receivers? Exactly what data is sent from a GPS satellite to a GPS receiver? I think there is multiple types of data, since when I start up a GPS receiver, it takes some time before it becomes useful
Is GPS more accurate on specific hours of the day? I have heard that the GPS system is more accurate, and less accurate on some specific hours on the day If this is true, how can I get the information on when GPS is more or less accurate at my lo
Does GPS usually use more than 4 satellites for a 3D fix In reading around it seems clear that 4 satellites are required for a 3D fix, and while it is often stated a GPS chipset will track more than 4 satellites, literature often implies it will only use 4
Heuristic relationship between number of satellites and GPS precision? Besides the number of satellites, there are several other factors that can create errors and biases in GPS positions The geometric position of the satellite constellation, ionospheric effects, signals bouncing on trees, buildings, etc So such a relationship would be very diluted in other errors and biases
Why dont they use cell towers like GPS satellites? 30 If my understanding is correct, a GPS satellite produces a pretty simple signal which is basically composed of its location and its time Given 4 of these signals, then one can uniquely solve for the X,Y,Z position (and as a by product, time) of the hand-held GPS unit Why don't we use use cell towers like we use GPS satellites?
Does the strength of GPS weaken in rural areas? Does the strength of GPS weaken in rural areas? For example, based on how the satellites work, would the strength in the centre of Australia differ from a populated city in Europe?
gps - How many satellites are actually used to get position . . . 1 NMEA 0183 Version 4 10 defines that there cannot be more than 12 satellites in GGA message: Number of satellites used (range: 0-12) But there can be more active satellites defined in GSA: satellites used for navigation, and DOP values So how many satellites are actually used to calculate position? See example: