1. Influence of Antenna Pattern Distortions on Surface Current Data collected by a CODAR HF-Radar System Josh T. Kohut Scott M. Glenn Donald E. Barrick

3. Radial Velocity Map A Brigantine Site Moored ADCP 25 km 25 cm/s Brant Beach Site

4. Radial Velocity Map A Brigantine Site Moored ADCP 25 km 25 cm/s Brant Beach Site Range Bearing Location

5. Antenna Patterns

6. Role of Antenna Patterns in Signal Direction Determination

7. Role of Antenna Patterns in Signal Direction Determination Loop 1 Loop 2 Monopole

8. Measured vs. Ideal Antenna Patterns

9. Calibration Runs Run Number Ground Plane Environment AntennaDate 1 8ft Brigantine Brigantine 10/99 2 4ft Brigantine Brigantine 10/99 3 8ft Brant BeachBrant Beach 10/99 4 4ft Brant BeachBrant Beach 10/99 5 4ft Brant BeachBrant Beach 09/00 6 4ft Brant Beach Brigantine 09/00

10. Calibration Runs Run Number Ground Plane Environment AntennaDate 1 8ft Brigantine Brigantine 10/99 2 4ft Brigantine Brigantine 10/99 3 8ft Brant BeachBrant Beach 10/99 4 4ft Brant BeachBrant Beach 10/99 5 4ft Brant BeachBrant Beach 09/00 6 4ft Brant Beach Brigantine 09/00

11. Measured Brant Beach Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop 2

12. Measured Brant Beach Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop 2 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5

13. Calibration Runs Run Number Ground Plane Environment AntennaDate 1 8ft Brigantine Brigantine 10/99 2 4ft Brigantine Brigantine 10/99 3 8ft Brant BeachBrant Beach 10/99 4 4ft Brant BeachBrant Beach 10/99 5 4ft Brant BeachBrant Beach 09/00 6 4ft Brant Beach Brigantine 09/00

14. Measured Antenna Patterns (4 ft) Brant Beach, NJ Loop 1 Loop 2 Brigantine, NJ 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5

15. Calibration Runs Run Number Ground Plane Environment AntennaDate 1 8ft Brigantine Brigantine 10/99 2 4ft Brigantine Brigantine 10/99 3 8ft Brant BeachBrant Beach 10/99 4 4ft Brant BeachBrant Beach 10/99 5 4ft Brant BeachBrant Beach 09/00 6 4ft Brant Beach Brigantine 09/00

16. Measured Antenna B Patterns Brant Beach, NJ Loop 1 Loop 2 Brigantine, NJ 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5

17. Measured Antenna Patterns (4 ft) Antenna A Loop 1 Loop 2 Antenna B 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5

18. Measured Antenna Patterns (4 ft) Antenna A Loop 1 Loop 2 Antenna B 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5

19. ADCP Comparisons

20. Radial Velocity Map A Brigantine Site Moored ADCP 25 km 25 cm/s Brant Beach Site

21. Measured Site 1 Antenna Pattern 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop 2

22. Ground Plane Remote Site RMS (cm/s) R 2 (%) 8 ft Brant Beach 12.2 60 8 ft Brant Beach 10.3 79 4 ft Brant Beach 10.1 79 4 ft Brant Beach 9.8 77 Ideal Patterns Measured Patterns ADCP and CODAR Radial Velocity Comparisons

23. Brant Beach Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop 2 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 ADCPADCP ADCPADCP

24. Ground Plane Remote Site RMS (cm/s) R 2 (%) Ideal Patterns Measured Patterns ADCP and CODAR Radial Velocity Comparisons 8 ft Brigantine 8.2 81 8 ft Brigantine 7.2 90 4 ft Brigantine 8.7 86 4 ft Brigantine 8.9 88

25. Brigantine Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop 2 40 60 80 100 120 140 160 180 200 220 Angle (Degrees From True North) 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 ADCPADCP ADCPADCP

26. Measured vs. Ideal

27. Radial Velocity Map A Brigantine Site Moored ADCP 25 km 25 cm/s Brant Beach Site Range Bearing Location

28. CODAR and ADCP Radial Velocity Comparisons (8 ft) Ideal Patterns Measured Patterns ADCPADCP

31.  Hardware setup and local environment play a significant role in pattern distortions  System accuracy improves with the measured patterns only when the measured patterns differ from the ideal.  Measured patterns improve system accuracy by placing the velocity vectors in the correct angular bin. Summary

32.  Scott Glenn  John Fracassi  Sage Lichtenwalner  Don Barrick  Pete Lilliboe Acknowledgements  Belinda Lipa  Liz Creed  Mike Crowley  Capt. Ron  Capt. Joe