PHARUS ASAR demonstrator

PHARUS is a polarimetric phased array C-band Synthetic Aperture Radar (SAR), designed and built for airborne use. Advanced SAR (ASAR) data in image and alternating polarization mode have been simulated with PHARUS to demonstrate the use of Envisat for a number of typical SAR applications that are not possible with the ERS satellites. These...

VIERS-1 scatterometer model

In this paper a description is given of a physically based theoretical ocean backscatter model (called the VIERS-1 model) for intermediate incidence angles, and a comparison of its performance against the CMOD4 empirical model is made. The VIERS-1 scatterometer algorithm is based on a two-scale composite surface model which includes both...

A summary of the VIERS-1 scatterometer model

The VIERS-1 (Verification and Interpretation ERS-1) project has resulted in a new algorithm for the interpretation of the wind scatterometer, based on a physical model of air/sea/radar interaction in which the radar backscatter is calculated from wind and wave conditions. The model is inverted to obtain the wind from the radar backscatter. For...

Mapping submarine sand waves with multiband imaging radar - 2. Experimental results and model comparison

On August 16, 1989, and on July 12, 1991, experiments were performed to study the mapping of submarine sand waves with the airborne imaging radar, a polarimetric (and, in 1991, interferometric) airborne P, L, and C band synthetic aperture radar system. The experiments took place in an area 30 km off the coast of the Netherlands, where the bottom...

Improved relation between radar backscatter from the ocean surface and surface wind vector

The simulated VIERS backscatter, obtained using the ECMWF wind and WAM wave fields, was compared with the backscatter as observed by the ERS1I satellite. The air-sea temperature difference was set to zero since neutral stability is the most common situation that occurs over the oceans. The period of interest was the 6th of November 1991 at l2.OO...

A simple analytical model for brightness modulations caused by submarine sand waves in radar imagery

Presented here is a simple analytical model based on established physics of the magnitude of the hydrodynamic modulations caused by sand waves. The model describes the modulations of the radar backscatter when first-order Bragg scattering is assumed. The major difference between this model and existing analytical models is that the specific...

VIERS-1 Final report phase 4

VIERS-1 Final report phase 4A

VIERS-1 Final report phase 3

Comparison of Microwave Backscatter Measurements and Small-scale Surface Wave Measurements Made from the Dutch Ocean Research Tower "Noordwijk"

To improve the understanding of the interaction between microwaves and water waves the VIERS-l project started in 1986 with the preparation of two wind/wave tank experiments and an ocean tower experiment. In February 1988, combined measurements of microwave backscatter, wind, waves and gas exchange have been carried out in the large Delft...

VIERS-1 progress report part-2: Completion of the laboratory experiments

This report is a sequel to BCRS-89-24: "Progress report on the VIERS-I project, part-1: the Delft experiment", in which the goals of the VIERS-1 project, the programme of activities, and the first laboratory experiment and its preliminary results were presented. In the first part of the present report the definitive results of the Delft...

Comparison of radar backscatter measurements and area extended wave slope measurements of wind generated waves in a large wind/wave tank with two-scale model predictions

Comparison of X-band radar backscatter measurements with area extended wave slope measurements made in a large wind wave tank

Combined measurements of microwave backscatter, wind, waves, and gas exchange have been carried out in the large Delft Hydraulics wind/wave tank. This experiment was the first of a series of experiments in the VIERS-1 project. In this project, a number of Dutch and one German laboratory cooperate to come to a physical description of the process...

First results of the VIERS-1 experiment

In February 1988, cornbined measurements of microwave backscatler, wind, waves and gas exchange have been carried out in the large Delft lHydraulics wind/rwave tank. This experiment was the first in a series of experimeuts in the frame of the VIERS-1 project. In this project a number of Dutch and German laborabories cooperate. Main objective is...

Progress report on the VIERS-1 project, Part 1: The Delft wind/wave experiment: experiment and first results