4. Historical Development of GPS 1978 -Launch of first GPS satellite . 1985 -Kinematic GPS surveying . 1989 -Launch of first Block II satellite Wide area differential GPs concept U.S Coast Guard GPSInformation System (GPSIC ). 1993 -Real-time Kinematic GPS Initial operational capability (IOC) on December 8 . 1995 -Full operational capability (FOC) on July 17 . 1996 -Presendential Decision Directive, first U.S GPS policy. 2000 - Selective availability set to Zero .
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7. A visual example of the GPS constellation in motion with the Earth rotating.
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9. System Overview The total GPS configuration is comprised of three distinct segments: (1) The space segment-Satellites orbiting the Earth (2) The control segment-Stations positioned on the Earth’s equator to control the satellites. (3) The user segment – Anybody that receives and uses the GPS signal .
10. Three Segments of the GPS Control Segment Space Segment User Segment Monitor Stations Ground Antennas Master Station
13. Control Segment Kwajalein Atoll US Space Command Hawaii Ascension Is. Diego Garcia Cape Canaveral Ground Antenna Master Control Station Monitor Station
14. Position is Based on Time T + 3 Distance between satellite and receiver = “3 times the speed of light” T Signal leaves satellite at time “ T ” Signal is picked up by the receiver at time “ T + 3 ”
23. How to know the stolen car place? GPS Chip receive The satellites signals And generate the Latitude and Longitude A mobile based System send (Lat&Lon) via SMS/GPRS To the car owner By using any mapping Software We can know Were the car is.
24. How to Lock the stolen car ? A built in µ.controller hold a text or a code about The lock operation. The car owner Communicate with The µ.controller Via SMS/GPRS To lock the car. The µ.controller start To perform the Lock Operation by cutting The power off.
29. Extracting or Parsing the GGA string A program can be written to serially read the incoming message strings and determine if it's a GPGGA message . If so, the program can extract and / or display only geospatial information we might want, like the time and longitude / latitude coordinates .
33. Sample frame sent to Nokia 3310 ( showed as a Hex dump ) Byte : 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 Data : 1E 00 0C D1 00 07 00 01 00 03 00 01 60 00 72 D5 Byte 0 : This is the F - Bus Frame ID . Cable is 0x1E . Byte 1 : the destination address 00 for the phone . Byte 3 : This is the message type or 'command' . Byte 2 : source address . PC's ID byte . 0x0C ( Terminal ). Byte 4&5 : the message length 4 is MSB & 5 is LSB
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