Science Service System

Summary of Proposal RES0072

Investigator Schulz-Stellenfleth, Johannes - German Aerospace Center (DLR), Remote Sensing Technology Institute, Marine Remote Sensing
Team Members
Prof. Kofoed, Jens Peter - Aalborg University, Department of Civil Engineering
Dr Holmes, Brian - Hydraulics & Maritime Research Centre, University College
Dr Pontes, Teresa - INETI, Department Renewable Energies
Prof. Dr. Peinke, Joachim - Carl v. Ossietzky University, Faculty of Physics
SummaryThe OceanPower-X project has the objective to assess the capabilities of the new TerraSAR-X instrument to support the exploitation of ocean wave energy. It is well known that spaceborne synthetic aperture radar (SAR) instruments provide valuable information on two-dimensional (2-D) properties of ocean wave fields independent of weather and daylight conditions. Algorithms to estimate the 2-D ocean wave spectrum and wave parameters like significant wave height, mean wave period, or mean wave propagation directions, were developed at the German Aerospace Center. The spaceborne wave measurements were up to now based on data acquired by the European Remote Sensing Satellites ERS-2 and ENVISAT , which provide a spatial resolution of about 20 m.With these C-Band sensors it was already possible to demonstrate the great potential of SAR data for wave measurements. The new TerraSAR-X satellite will have a spatial resolution of up to 1 m, which will provide a completly new view in particular at ocean wave fields near the coast, which are of high relevance for wave energy exploitation. Furthermore TerraSAR-X has a couple of additional features, which make it a very interesting tool for the observation of ocean waves like, e.g., the relatively low flight altitude and rather long integration time in spotlight mode. To use TerraSAR-X data for the derivation of ocean wave information several steps have to be taken. First of all the existing algorithms, which were developed for C-Band radar with moderate resolution, will be adjusted to high resolution X-band data. Secondly new approaches will be developed which make use of the advanced technical features and new imaging modes of TerraSAR-X. The development of the algorithms will be guided by the special requirements of the wave energy community, which is involved in the project. Within the project data acquired over different test sites proposed by the partners will be analyzed. Ocean wave parameters will be estimated from the data at DLR. The partners from the wave energy community will give comments on the retrieved parameters, which will be taken into account for the optimisation of the wave measurements and the selection of wave parameters relevant for specific applications. The work on the TerraSAR-X algorithm development will be covered by both internal and external funding. The main output of the project will be a report on TerraSAR-X wave measurement techniques taking into account the special requirements of the ocean wave energy community.

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DLR 2004-2016