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Validation of a CODAR HF-Radar System at the Longterm Ecosystem Observatory

Optimized. Validation of a CODAR HF-Radar System at the Longterm Ecosystem Observatory. ^. Josh T. Kohut Scott M. Glenn John F. Fracassi Robert J. Chant. Dr Jeff Paduan, Dr. Don Barrick, Pete Lilleboe. CODAR Total Vector Calculation. Kilometers. CODAR North.

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Validation of a CODAR HF-Radar System at the Longterm Ecosystem Observatory

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  1. Optimized Validation of a CODAR HF-Radar System at the Longterm Ecosystem Observatory ^ Josh T. Kohut Scott M. Glenn John F. Fracassi Robert J. Chant Dr Jeff Paduan, Dr. Don Barrick, Pete Lilleboe

  2. CODAR Total Vector Calculation Kilometers CODAR North 0 5 10 Little Egg Harbor Great Bay LEO-15 A T L A N T I C O C E A N Atlantic City

  3. CODAR Total Vector Calculation Kilometers 0 5 10 Little Egg Harbor Great Bay LEO-15 A T L A N T I C O C E A N CODAR South Atlantic City

  4. CODAR Total Vector Calculation Kilometers CODAR North 0 5 10 Little Egg Harbor CODAR Central Site Great Bay ? LEO-15 A T L A N T I C O C E A N CODAR South Atlantic City

  5. C Radial Velocity Comparison with ADCP C CODAR Site Moored ADCP 25 km A 25 cm/s

  6. 209 210 211 212 213 214 215 216 209 210 211 212 213 214 215 216 Raw Velocity Comparison with ADCP C Northern Site RMS = 7.2 cm/s ADCP CODAR Time (year-day) Southern Site RMS = 9.5 cm/s Time (year-day)

  7. 209 210 211 212 213 214 215 216 209 210 211 212 213 214 215 216 Tidal Velocity Comparison with ADCP C Northern Site RMS = 1.6 cm/s ADCPCODAR Time (year-day) Southern Site RMS = 4.3 cm/s Time (year-day)

  8. A C Radial Velocity Comparison with ADCP A CODAR Site Moored ADCP 25 km A 25 cm/s

  9. Raw Velocity Comparison with ADCP A Northern Site RMS = 19.5 cm/s ADCPCODAR A 200 201 202 203 204 205 206 Time (year-day) Southern Site RMS = 19.6 cm/s 200 201 202 203 204 205 206 Time (year-day)

  10. Role of Antenna Patterns in Signal Direction Determination

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

  12. Measured vs. Ideal Antenna Patterns

  13. Measured vs. Ideal Antenna Patterns 8 ft Antenna Elements

  14. Measured vs. Ideal Antenna Patterns 4 ft Antenna Elements

  15. Configuration Tests • Ideal Antenna Pattern Assumption (8 foot elements) • Ideal Antenna Pattern Assumption (4 foot elements) • Smoothed Measured Antenna Patterns (4 foot elements) • Measured Antenna Patterns (4 foot elements) • Interpolation (Guassian Fit)

  16. 4 ft Ideal Patterns RMS = 8.6 cm/s R2 = 0.78 NP = 61 Northern Site Antenna Comparisons 8 ft Ideal Patterns RMS = 17.4 cm/s R2 = 0.14 NP = 456

  17. 4 ft Smooth Patterns RMS = 9.0 cm/s R2 = 0.80 NP = 120 Northern Site Antenna Comparisons 4 ft Ideal Patterns RMS = 8.6 cm/s R2 = 0.78 NP = 61

  18. 4 ft Measured Patterns RMS = 8.3 cm/s R2 = 0.84 NP = 114 Northern Site Antenna Comparisons 4 ft Smooth Patterns RMS = 9.0 cm/s R2 = 0.80 NP = 120

  19. 4 ft Interpolated Patterns RMS = 7.9 cm/s R2 = 0.86 NP = 278 Northern Site Antenna Comparisons 4 ft Measured Patterns RMS = 8.3 cm/s R2 = 0.84 NP = 114

  20. 4 ft Ideal Antenna Patterns 90 25 km 25 km 80 70 60 50 40 30 20 10 Northern Site Radial Coverage 8 ft Ideal Antenna Patterns Percent Coverage

  21. 4 ft Measured Patterns 90 25 km 25 km 80 70 60 50 40 30 20 10 Northern Site Radial Coverage 4 ft Ideal Patterns Percent Coverage

  22. 4 ft Interpolated Patterns 90 25 km 25 km 80 70 60 50 40 30 20 10 Northern Site Radial Coverage 4 ft Measured Patterns Percent Coverage

  23. Summary • Validation was angularly dependent prior to system tests • Good comparisons within total vector coverage area • Poor comparisons near the coast • Pattern measurements proved valuable in system optimization • Measured vs. smooth/measured patterns showed no real difference • Interpolation software further optimized the system • Number of data points • Qualtiy of data points

  24. 8 ft Ideal Patterns RMS = 17.4 cm/s R2 = 0.14 NP = 456 4 ft Interpolated Patterns RMS = 7.9 cm/s R2 = 0.86 NP = 278 Summary

  25. 4 ft Interpolated Patterns 8 ft Ideal Patterns 90 25 km 25 km 80 70 60 50 40 30 20 10 Percent Coverage Summary

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