| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a system for inversely estimating an ocean wave direction spectrum from a radar image with high accuracy, with a small amount of calculation. SOLUTION: In a method for reverse estimation of the ocean wave direction spectrum, from the image obtained by irradiating the ocean surface with radio waves by a radar and then processing the back scattered intensity, the ocean wave direction spectrum is expressed by an exponential function having a discrete constant value function in the exponential part, which is applied to a relational expression between the ocean wave direction spectrum and a two-dimensional wave number spectrum of the radar image, based on a quasi-linear theory, and which is expanded by the coordinates of the direction of the radar and the frequency so that the ocean wave direction spectrum is obtained from the intensity image of the back scattered wave, by introducing a Bayesian model. An integral equation may be approximated by a nonlinear algebraic equation, by taking the logarithm for the integral equation, and by restricting the ocean wave direction of the wave to a semicircle direction so that the integration is made discrete. COPYRIGHT: (C)2005,JPO&NCIPI |
