Weimin Huang, Ruben Carrasco, Chengxi Shen, Eric W

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Presentation transcript:

Further Validation of the Polar-Current-Shell Current Algorithm for X-band Marine Radar Weimin Huang, Ruben Carrasco, Chengxi Shen, Eric W. Gill, Jochen Horstmann

Outline 1. Introduction 2. Polar-Current-Shell (PCS) Algorithm 3. Experiment Results 4. Conclusion

1. Introduction

Typical Pulsed Marine Radar Image

Existing Current Algorithms Least-squares (1985) Weighted least-squares (2002) Iterative least-squares (ILS) (2001) Dispersive Surface Classificator (DiSC) (2007) Normalized scalar product (NSP) (2010)

2. Polar-Current-Shell (PCS) Algorithm

1. Collecting temporal sequence of radar sub-images Key steps 1. Collecting temporal sequence of radar sub-images 32Δt y t x

See more details on next slide. 2. Obtaining 3-D image spectra by 3-D FFT on sub- image sequence 3. Extraction of the dispersion shell 4. Obtaining polar current shell 5. Determining the current parameters See more details on next slide.

Block diagram 𝜔 𝑈 𝑘 𝑥 , 𝑘 𝑦 =𝑘𝑈𝑐𝑜𝑠 𝜃 = 𝜔 0 𝑘 𝑥 , 𝑘 𝑦 − 𝑔𝑘 𝜔 𝑈 𝑘 𝑥 , 𝑘 𝑦 =𝑘𝑈𝑐𝑜𝑠 𝜃 = 𝜔 0 𝑘 𝑥 , 𝑘 𝑦 − 𝑔𝑘 𝜔 𝑈 𝑘, 𝜃 𝑘 =𝑘𝑈𝑐𝑜𝑠 𝜃 =𝑘𝑈𝑐𝑜𝑠( 𝜃 𝑘 − 𝜑 𝑈 ) 𝜔 𝑈 (𝑘, 𝜃 𝑘 ) 𝑘 =𝑈𝑐𝑜𝑠( 𝜃 𝑘 − 𝜑 𝑈 )

3. Experiment Results

Radar system specification Radar data information Radar system specification Collecting date 07/30/2014; 08/28/2014 Polarization VV Radar location (FINO3 platform) 55.195 N, 7.158 E Antenna rotation speed 28 rpm Range resolution 7.5 m FINO-3 offshore research platform

Results (current speed) Comparison of ADCP-measured and radar-derived current speed

Results (current direction) Comparison of ADCP-measured and radar-derived current direction

Results (sea state) Significant wave height (blue) and wind speed (red)

Results (cont.) Zoomed view of current results: speed (left); direction (right)

Results (cont.) Distribution of current direction estimation error with respect to ADCP-measured current speed.

Results (difference) Scatter plot of the difference of current vector East and North components measured by ADCP (at 8 m depth) and radar (left) ILS; (middle) NSP; (right)PCS.

Results (error statistics)

4. Conclusion

Current information extracted from V-pol marine radar images using the polar-current-shell (PCS) algorithm. Radar results from the PCS algorithm agree with the ADCP data. The performance of the PCS algorithm is similar to that of the NSP and ILS methods.

Acknowledgement 1. NSERC Discovery grant support. 2. Department of Innovation, Business and Rural Development of Newfoundland and Labrador grant support.

Thank you! Any questions?