18 October 2010 Simulation and evaluation for measuring directional ocean wave spectrum from SWIM on CFOSAT
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Abstract
SWIM is a satellite-based Ku-band real aperture radar designed for measuring the directional ocean wave spectrum. This radar works at six incidence angles (from 0 degree to 10 degree) with the 360 degree azimuth scanning. The measurement principal has been proposed by Jackson and the simulation technology has been developed by Hauser, which depends on the comparisons between estimated modulation spectrum and reference one. Based on the method after the slightly modification, we consider the SWIM performance for measuring wave properties in cases of no noise, noise and noise with correction. Moreover, we propose the four methods to calculate the coefficient α(θ) , which include integration method, derivative method, wind speed experience method and significant wave height method. We substitute the α(θ) into the simulation, in which the forward simulation only use the integration method and the afterward simulation use the four method alternatively. From the results, it shows that the SWIM has the capacity of measuring the wave spectrum but it requires the proper processing for the elimination and correction of noise. Among the four methods, the wind speed experience method has a big deviation with reference spectrum, the integration and derivative methods have good results of measurements and the significant wave height method has moderate error and shows good in low wind speed.
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Lin Ren, Lin Ren, Delu Pan, Delu Pan, Zhihua Mao, Zhihua Mao, Difeng Wang, Difeng Wang, Jianyu Chen, Jianyu Chen, } "Simulation and evaluation for measuring directional ocean wave spectrum from SWIM on CFOSAT", Proc. SPIE 7825, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010, 78250D (18 October 2010); doi: 10.1117/12.864895; https://doi.org/10.1117/12.864895
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