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GPS Project Dr. Glen Lightsey

GPS Project Dr. Glen Lightsey. Investigation of How Accuracy of GPS Measurements is Affected by Errors in the Navigation Data. General Error Sources. Space Segment Satellite clock stability Predictability of satellite perturbations Control Segment Ephemeris prediction error

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GPS Project Dr. Glen Lightsey

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  1. GPS ProjectDr. Glen Lightsey Investigation of How Accuracy of GPS Measurements is Affected by Errors in the Navigation Data

  2. General Error Sources • Space Segment • Satellite clock stability • Predictability of satellite perturbations • Control Segment • Ephemeris prediction error • Thruster performance • User Segment • Atmospheric delay (ionospheric, tropospheric) • Multipath

  3. Project Error Source • Project error from control segment • Input error into navigation message • Diverge IODE/IODC • Four different runs • Single satellite/all satellites • Data collected

  4. Analysis Performed • Used Matlab script to generate: • X, Y, Z residuals • X, Y, Z mean and standard deviations • PDOP • The following plots show the results

  5. Run 1

  6. Run 2

  7. Run 3

  8. Run 4

  9. Run 1 and Run 2

  10. Run 3 and Run 4

  11. Run 1 Run 2 Run 3 Run 4 XStandard Deviation 2.839260665295466 4.272239014080701 4.406938111010710 3.210611943544223 X Mean Deviation -1.810899195591854 2.238524831074054 1.452102527436283 2.196910571407352 YStandard Deviation 2.081125597206021 2.951748558515313 2.749183333205866 3.271725145171435 Y Mean Deviation 2.109895809803447 1.272517605795222 1.813049299283367 1.244333143827680 ZStandard Deviation 1.535638959253165 1.168424213523795 1.124988085860343 1.363715962099733 Z Mean Deviation -2.532220018706219 8.770300506681473 -4.110255008356439 6.321518295255373 Mean and Standard Deviations for all runs

  12. Conclusions • In general, run 2 was noisier than most • Run 4 was less noisy than either 2 or 3 • Runs 2,3,and 4 were noisier than 1 • Runs 2 and 3 were not very different • The accuracy was degraded by approximately 2 to 5 meters

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