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.

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Presentation transcript:

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

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

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

Antenna Patterns

Role of Antenna Patterns in Signal Direction Determination

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

Measured vs. Ideal Antenna Patterns

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

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

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

Measured Brant Beach Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop Angle (Degrees From True North)

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

Measured Antenna Patterns (4 ft) Brant Beach, NJ Loop 1 Loop 2 Brigantine, NJ Angle (Degrees From True North)

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

Measured Antenna B Patterns Brant Beach, NJ Loop 1 Loop 2 Brigantine, NJ Angle (Degrees From True North)

Measured Antenna Patterns (4 ft) Antenna A Loop 1 Loop 2 Antenna B Angle (Degrees From True North)

Measured Antenna Patterns (4 ft) Antenna A Loop 1 Loop 2 Antenna B Angle (Degrees From True North)

ADCP Comparisons

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

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

Ground Plane Remote Site RMS (cm/s) R 2 (%) 8 ft Brant Beach ft Brant Beach ft Brant Beach ft Brant Beach Ideal Patterns Measured Patterns ADCP and CODAR Radial Velocity Comparisons

Brant Beach Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop Angle (Degrees From True North) ADCPADCP ADCPADCP

Ground Plane Remote Site RMS (cm/s) R 2 (%) Ideal Patterns Measured Patterns ADCP and CODAR Radial Velocity Comparisons 8 ft Brigantine ft Brigantine ft Brigantine ft Brigantine

Brigantine Antenna Patterns 8 ft Ground Plane 4 ft Ground Plane Loop 1 Loop Angle (Degrees From True North) ADCPADCP ADCPADCP

Measured vs. Ideal

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

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

 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

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