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Maritime environment, and in particular the sea clutter, has a significant impact on the detection efficiency. Therefore the physical properties of the radar sea clutter must be well mastered. In this paper, we focus on sea clutter data acquired during an experiment called MARLENE, which was held in the Mediterranean Sea region of Toulon, France, in 2014. The aim of this experiment was to characterize...
In the maritime boundary layer, air-sea interaction processes have an important impact on radar propagation. The radar range performance near the sea surface depends on meteorological and sea surface conditions. Strong gradients of humidity and temperature close to the air-water interface are most often the reason for propagation effects such as ducting. For ship borne radars the evaporation duct...
This paper addresses an experiment that was carried out in the North Sea region in the area of the island of Sylt with the aim to study the influence of the maritime boundary layer (MBL) on the propagation of radar signals under low grazing angle geometry. The radar measurements were carried out with the highly versatile MEMPHIS radar operating in sea configuration at X, Ka and W band simultaneously...
Given a set P of m subpaths of a length n path P, Györi’s theorem gives a min-max formula for the smallest set G of subpaths, the so-called generators, such that every element of P arises as the union of some members of G. We present an implementation of Frank’s algorithm for a generalized version of Györi’s problem that applies to subpaths of cycles and not just paths. The heart of this algorithm...
In the framework of Germany and France cooperation, a specific experiment called MARLENE has been carried out in the Mediterranean sea region off Toulon, France, in spring 2014. It aims at characterizing sea environmental influence on electromagnetic wave propagation and sea backscattering for Refractivity From Clutter (RFC) and radar Doppler detection. Environment measurements and characterization...
This contribution reports about experimental activities during the 2011 Squirrel campaign in the Baltic Sea, where a number of in- and outbound runs of the Mittelgrund research vessel were measured by the Fraunhofer FHR MEMPHIS Radar in sea configuration at both Ka and W band. Aboard the employed vessel, four corner-reflectors (CR) at different heights in forward and backward direction where mounted...
The results of a propagation experiment with measurements above the sea surface during September 2011 in the frame of the Squirrel campaign are shown. For the experiment, MEMPHIS, a highly versatile radar developed at Fraunhofer FHR (former FGAN) was applied to perform a number of measurements towards a point target (corner reflector) located at the Bookniseck site over a pathlenghts of nearly 8 km...
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