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  • What data is sent from GPS satellites to receivers?
    There are 3 parts to the GPS signal: A satellite ID (called the Pseudo Random Code) Almanac data (orbital information for all the satellites)
  • Why does GPS positioning require four satellites?
    Even when GPS is leveraging more than 4 satellites, it is still doing trilateration, as opposed to multilateration, which GPS does not use Multilateration should not be confused with trilateration, which uses distances or absolute measurements of time-of-flight from three or more sites , or with triangulation, which uses the measurement of
  • gps - One-signal satellites data in RTCM messages - Geographic . . .
    at the same time, I know from DF394 that the first of the visible satellites is PRN02, the second is PRN13 Both of these satellites are Block IIR And there are three more such visible satellites there And Block IIR supports only one signal: L1 C A But in my RTCM message there are measurement data for two signals from these satellites
  • gps - How many satellites are actually used to get position . . .
    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:
  • gps - Satellites needed to receive proper 1pps signal - Geographic . . .
    I updated the answer to specify four satellites for an general GPS solution To be honest, I assumed this was a theoretical question, because you will almost always have enough satellites for a solution, and you want to "coast" your timing solution on the rubidium clock in any case, because GPS measurements have much higher white noise levels
  • Is GPS more accurate on specific hours of the day?
    The satellite constellation is designed to provide the best coverage around the entire globe (at an apogee of 63 9 degrees) What you will see is that at a certain time of day you will see the same satellites The US has control of the GPS satellites and can speed up or slow down the satellites for their purposes
  • Why dont they use cell towers like GPS satellites?
    And they can be given atomic clocks just like GPS satellites are given Then we would have more redundancy, more availability, and more accuracy in determining location Note: I know that the E911 service uses cell tower to triangulate the position of cell phones, but this technology is based upon measuring the signal strength of the tower and
  • In hyperbola model of how GPS equations are solved, why do 3 satellites . . .
    Older GPS units may take up to an hour to search for satellites, download the almanac and ephemeris data and obtain an initial position, though newer GPS units may require much less than this If the GPS receiver has moved several hundred kilometres, its assumptions about which satellites to use will be incorrect and it will have to search for
  • What is the maximum Theoretical accuracy of GPS?
    Tested were the following GPS telemetry, GPS data loggers and a hand held GPS GPSFlight STX900e telemetry, embedded GPS unit ublox LEA - S5 BRB 900 MHz GPS Telemetry, Lassen IQ series GPS receiver TLA 900 MHz GPS Telemetry, ublox 6 series GPS receiver Holux 1200e GPS data logger Tripmate 852 GPS data logger, GPS chipset, MTK Garmin
  • Is there an industry-standard official mapping of GLONASS satellites to . . .
    However, an ID is still available for GLONASS satellites for many GPS receiver positioning platforms that support dual GPS GLONASS positioning, often via the same access point as the PRN value for U S GPS satellites (e g , on Android via the GpsSatellite getPrn() method, with seemlingly standardized values across devices I've seen from 65 to 88





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