GPS (Global Positioning System) application
- 3. WHAT IS GPS? • Satellite based navigation system. • Based on a constellation of about 24 satellites • Developed by the United States Department of Defense (DOD)
- 4. How GPS come ??? Being crucial of navigation and positioning process, its difficult and slow in the earlier days. Then U.S department of Defense decided that military should have a precise form of worldwide positing. The result is the Global Positioning System.
- 5. HOW GPS DETERMINES A LOCATION Things which need to be determined: Current Locations of GPS Satellites The Distance Between Receiver’s Position and the GPS Satellites
- 7. Measuring Distance Explanation Satellite portion: generate C/A codes as PRN sequence. Receiver Portion Compute C/A’s replica code. Transmit a PRN, keep codes in memory Done by using auto correlation function of the received signal.
- 8. Accurate Measurements of GPS Current Time Satellite Position Time Delay
- 9. GPS Signals & Frequencies Signals: Coarse/Acquisition code Precision code Navigation message Almanac Data updates Frequencies: L1 1575.42 MHz L2 1227.60 MHz L3 1381,05 MHz L4 1379.913 MHz L5 1176.45 MHz
- 10. Impacts of Cross-Correlation on Acquisition Performance Actually a cross-correlation disturbs the acquisition performance: Inaccurate doppler frequency Code delay User position estimation
- 11. Aviation • Cost effective solution • Increase the safety and efficiency Survey & mapping • Accuracy • Reliability • Interoperability Application
- 12. Space • Navigation solutions • Altitude solutions • Timing solutions & etc. Marine • saving navigators time and fuel. • navigation information to boaters. • Increases safety and security.
- 13. Rail • improved safety of trains and maintenance crews. • Increased capacity and efficiency • Time synchronization for communication systems Agriculture • soil sampling, collection, analysis to suit specific areas. • work with low visibility. • minimizes redundancy, maximum ground coverage
- 14. MILITARY • Target tracking • Search and Rescue Roads & Highways • Higher levels of safety and mobility for surface transportation • Increased efficiencies reduced costs
- 16. Future Technology GPS wrist Bands Positioning Head Gear Autonomous Tractors