Estimation of sea state parameters using X-band marine radar technology in coastal areas

Wendy Navarro; Juan C. Vélez; Alejandro Orfila

doi:10.1117/12.2322614

6 August 2018 Estimation of sea state parameters using X-band marine radar technology in coastal areas

Wendy Navarro, Juan C. Vélez, Alejandro Orfila

Proceedings Volume 10773, Sixth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2018); 107730X (2018) https://doi.org/10.1117/12.2322614
Event: Sixth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2018), 2018, Paphos, Cyprus

Abstract

X-Band marine radars have been broadly used as a coastal remote sensing tool since they are able to scan the roughness of sea surface with high spatial and temporal resolution. However, radar estimates are strongly affected by shadowing effects at extreme grazing incidence angles, mainly when the radar antenna is deployed below 50 m above the mean sea level (MSL). The present study presents a novel methodology based on filtering and interpolation techniques in order to improve the estimation accuracy of sea state parameters in coastal areas. The method differs from previous approaches since it employs enhancement techniques using intensities data beam by beam of the sea clutter image and considering extreme grazing incident angles from electromagnetic signal instead of offshore empirical MTF correction and calibration with in situ sensors. A FURUNO FR-8252 X-Band marine radar was deployed in Salgar (Colombia) at about 20 meters above the mean sea level to test the performance of the proposed methodology. Validation was performed with in situ data from a Nortek AWAC (Acoustic Wave and Current) sensor located at 1.4 km away from the radar antenna. Results show that the significant wave height was retrieved with 0.6% error (about -1.21 cm) and the estimation errors of the peak period and the peak wave direction were below to 0.75 seconds and 4°, respectively. The wave frequency spectra derived from radar estimates, AWAC record and JONSWAP spectrum are presented to illustrate the improvement resulting from the proposed methodology over frequency domain.

Citation Download Citation

Wendy Navarro, Juan C. Vélez, and Alejandro Orfila "Estimation of sea state parameters using X-band marine radar technology in coastal areas", Proc. SPIE 10773, Sixth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2018), 107730X (6 August 2018); https://doi.org/10.1117/12.2322614

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