Estimation of Directional Surface Wave Spectra from a Towed Research Catamaran*

Maximum entropy estimation of directional wave spectra from an array of wave probes

A procedure for estimating directional wave spectra from an array of wave probes based on the Maximum Entropy Method (MEM) is developed in the present paper. The MEM approach yields an angular spreading function at each frequency band consistent with the input crossspectral density matrix. The method is evaluated using numerical simulations of directional sea states. The MEM is also used to ana...

Dynamical partitioning of directional ocean wave spectra

Directional wave spectra generally exhibit several peaks due to the coexistence of wind sea generated by local wind conditions and swells originating from distant weather systems. This paper proposes a new algorithm for partitioning such spectra and retrieving the various systems which compose a complex sea-state. It is based on a sequential Monte-Carlo algorithm which allows to follow the time...

Position Estimation of a Towed Underwater Body

The Microwave Measurement of Ocean-wave Directional Spectra

When we attempt to gain knowledge about the temporal and spatial variations of sea-surface displacements caused by waves, various levels of information may be specified. The most complete knowledge of sea-surface displacements would be obtained from two-dimensional images taken successively in time. Resolutions and sampling intervals in both space and time could be adjusted to control the amoun...

Sensitivity Analysis of a Wideband Backward-wave Directional Coupler Using Neural Network and Monte Carlo Method (RESEARCH NOTE)

In this paper sensitivity analysis of a wideband backward-wave directional coupler due to fabrication imperfections is done using Monte Carlo method. For using this method, a random stochastic process with Gaussian distribution by 0 average and 0.1 standard deviation is added to the different geometrical parameters of the coupler and the frequency response of the coupler is estimated. The appli...