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16.11. Types of Inertial Systems............................................................................................... 330
16.12. Principles....................................................................................................................... 330
16.13. Components.................................................................................................................... 330
16.14. Linear Accelerometers ................................................................................................... 331
Figure 16.1. A Basic Inertial System.................................................................................................. 331
16.15. Gyroscopes ..................................................................................................................... 332
16.16. Stable Platform............................................................................................................... 332
Figure 16.2. Stable Platform............................................................................................................... 333
Figure 16.3. Gimbal Platform............................................................................................................. 333
16.17. Measuring Horizontal Acceleration ............................................................................... 334
Figure 16.4. Effect of Accelerometer Tilt .......................................................................................... 334
Figure 16.5. Apparent Precession....................................................................................................... 335
Figure 16.6. Schuler Pendulum Phenomenon..................................................................................... 336
16.18. Integrator ........................................................................................................................ 337
16.19. Computer....................................................................................................................... 337
Figure 16.7. Geographic References .................................................................................................. 338
Figure 16.8. Measurement of Aircraft Groundspeed.......................................................................... 338
16.20. Summary ........................................................................................................................ 338
AFPAM11-216 1 MARCH 2001 17
Section 16D NAVSTAR Global Positioning System
16.21. Basics ............................................................................................................................. 339
Figure 16.9. World Geodetic System 1984 ........................................................................................ 339
16.22. Military Applications ..................................................................................................... 339
16.23. Civilian Applications ..................................................................................................... 340
16.24. General System Description........................................................................................... 340
Figure 16.10. GPS Constellation .......................................................................................................... 340
Figure 16.11. Handheld User Equipment Set ....................................................................................... 341
Figure 16.12. GPS Control Segment .................................................................................................... 342
16.25. Theory of Operation ....................................................................................................... 342
Figure 16.13. PRN Code Comparison .................................................................................................. 343
Figure 16.14. Resolution of Position .................................................................................................... 344
Figure 16.15. Signal Bandwidth ........................................................................................................... 344
16.26. Clock Error and Pseudo Range ...................................................................................... 344
16.27. Satellite Clock Error....................................................................................................... 345
16.28. Ephemeris Error ............................................................................................................. 345
16.29. Atmospheric Propagation Error ..................................................................................... 345
16.30. Survivability and Security.............................................................................................. 345
16.31. Summary ........................................................................................................................ 346
　
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