Using Coherent Marine Radar to Detect Surface Currents

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Presentation transcript:

Using Coherent Marine Radar to Detect Surface Currents Lisa Nyman Björn Lund, Roland Romeiser, and Hans Graber Rosenstiel School of Marine and Atmospheric Science, University of Miami SOMaR-4 Workshop - May 9, 2017

Cruise 2- ROI March 2017 R/V Roger Revelle Cruise 1- ROI May 2016

Doppler Marine Radar (DMR)

Theory Complex data from coherent radar Phase Shift Analysis Phase Difference between: Theory This Region This Region & This Region This Region Complex data from coherent radar Phase Shift Analysis Doppler Velocity Measurements Phase of Signal

Theory Perfect 5 m/s uniform radial velocity at 30° 72 pieces *Positive AWAY from the Radar

Doppler Velocity At first, the plots looked like this Smokestack Main Mast Range-Averaged Radial Velocity in Polar Coordinates At first, the plots looked like this Assume uniformity in entire 3.2 km radius Really rough direction and magnitude

Doppler Velocity Properly-Calibrated Phase Difference Eliminate Noise May 20, 2016 00:59:43 UTC Properly-Calibrated Phase Difference Wave patterns! Eliminate Noise Velocity Calculation Current Vectors in 3.2 km radius around the ship Ship Motion!

Preliminary Results- Palau

Preliminary Results- Taiwan March 14, 2017 11:36:52 GMT 3 m/s Doppler Velocity Map March 14, 2017 12:53:08 GMT

Future Work Single-Look Multi-look Idea Adjustment for wave motions Adjustment for wind contribution Optimize to run in real-time on a vessel Multi-look Idea Temporal average while ship is moving No “blind spots” Less noise