1. 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

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

3. Doppler Marine Radar (DMR)

4. 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

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

6. 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

7. Doppler Velocity Properly-Calibrated Phase Difference Eliminate Noise
May 20, :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!

8. Preliminary Results- Palau

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

10. 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