Surface-Wavefield Estimation From Coherent Marine Radars

One major impediment to using marine radars for real-time shipboard measurements of evolving ocean wavefields is the uncertainty in the transfer function that relates the radar cross section to sea-surface height. In this letter, a more direct approach is proposed to infer nonlinear sea-surface heig...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2010-10, Vol.7 (4), p.631-635
Main Authors: Nwogu, O G, Lyzenga, D R
Format: Article
Language:English
Subjects:
Antennas
Coherence
Coherent-on-receive
Computer simulation
Doppler radar
Doppler radars
Error detection
Extraterrestrial measurements
Marine
Mathematical models
ocean currents
Ocean waves
Radar
Radar antennas
Radar cross section
Radar imaging
Radar measurements
Radar remote sensing
radial velocity
remote sensing
Sampling
Sea measurements
Transfer functions
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Summary:One major impediment to using marine radars for real-time shipboard measurements of evolving ocean wavefields is the uncertainty in the transfer function that relates the radar cross section to sea-surface height. In this letter, a more direct approach is proposed to infer nonlinear sea-surface heights by using radial-velocity measurements from coherent marine radars. The radial velocities are initially integrated along range lines to obtain a scalar potential function. The velocity potential field is then differentiated with respect to time to yield the sea-surface height. Numerical simulations have been conducted to evaluate the sensitivity of the proposed scheme to sampling errors and noise. Under idealized conditions, the results demonstrate that the sea-surface elevation can be reliably estimated from the radial-velocity field provided that the antenna-rotation period is much smaller than a characteristic wave period.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2010.2043712