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FP5

OROMA Résumé de rapport

Project ID: EVK3-CT-2001-00053
Financé au titre de: FP5-EESD
Pays: Germany

Mapping of calibrated radar cross-section using ship board coherent x-band radar (method)

The radar cross section is a quantifying number of a reflecting or backscattering surface in a well defined distance to the antenna. In hydrography this quantifier is proportional to the given sea surface tilt and roughness. The calibration process of the radar cross section is achieved by transmitting in a series of microwave signals with defined amplitudes - produced by a signal generator - into the microwave guide fed in behind the antenna towards the receiver. The acquired signal damping is valid for both signal directions: transmitted and received. The characteristic of the receiver is attained from the acquired damping line. For the calibration the same A/D conversion device as the one used for the field measurement is used. As the antenna gain can be assumed to be invariant in time it could be taken from the producer notifications (see: OROMA delivery report D3.1).

Synchronised to the radar data acquisition a precise positioning system is running to allow the geo-coded mapping process. The accuracy of the GPS deduced position is enhanced by using a shore based reference station. This set up allows to track the actual antenna position with an accuracy better then 10cm in x,y and z and their view direction with an accuracy of 0.1°. The positions updating is acquired with 1Hz and the directions updating with 5Hz. By this precise tracking of the radar antenna guarantees that the radar resultion is not degraded by the geo-coding process.

Reported by

GKSS
Max-Planck-Strasse 1
21502 Geesthacht
Germany
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