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GPS System Description

GPS System Description. Space-based radio navigation system providing: Precise position, velocity and time (pvt) Continuous, worldwide, 24 hour a day coverage Passive; can serve an unlimited number of users All-weather operation

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GPS System Description

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  1. GPS System Description • Space-based radio navigation system providing: • Precise position, velocity and time (pvt) • Continuous, worldwide, 24 hour a day coverage • Passive; can serve an unlimited number of users • All-weather operation • U.S. Government system run by the DoD Adminstered by the U.S. Air Force • Has large variety of defense and civil applications

  2. ~ ~ ~ ~ GPS Position Determination Technique X2, Y2, Z2 t2 t3 Time for S1 X3, Y3, Z3 X1, Y1, Z1 t1 t4 GPS S3 X4, Y4, Z4 GPS S2 (P2) (P3) GPS S4 S1 Position (P1) GPS S1 (P4) R2 R3 R1 R4 User measures pseudoranges to satellites (R1, R2, R3, R4) User receives and stores data on satellite locations (P1, P2, P3, P4) and their motion P0 User tu 135.1-1 A504f

  3. Space Segment GPS System Segments User Segment Monitor/ Uplink Stations Colorado Springs ¹Hawaii Kwajalein Ascension Island Diego Garcia ²Cape Canaveral, FL Control Segment Headquarters Colorado Springs Schriever AFB Backup OCS Vandenberg AFB ¹ Monitor station only ² Uplink station only Backup OCS Gaithersburg, MD 135.1-1/111-1 V006g

  4. The Navstar GPS Operational Constellation(24 Satellite Baseline Configuration) Note: As of 2004-05, there are about 28-30 S/C in the constellation. 135.1-1/111-1 A401f

  5. Garmin iQue GPS Palm OS

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