Using Coherent Marine Radar to Detect Surface Currents

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 SOMa. R-4 Workshop - May 9, 2017

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

Doppler Marine Radar (DMR)

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

Theory 72 pieces *Positive AWAY from the Radar

Doppler Velocity Range-Averaged Radial Velocity in Polar Coordinates • At first, the plots looked like this Smokest ack • Assume uniformity in entire 3. 2 km radius • Really rough direction and magnitude Main M ast

Doppler Velocity 1. Properly-Calibrated Phase Difference Wave patterns! 2. 3. 4. Eliminate Noise Velocity Calculation Current Vectors in 3. 2 km radius around the ship Ship Motion! May 20, 2016 00: 59: 43 UTC

Preliminary Results- Palau

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

Future Work • Single-Look • 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