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WHD3000 - Waveheight Detection
Researching in small target detection based on radar makes it necessary to search for targets with a signal to noise (clutter) ratio of less than 1. In order to detect targets in such environments VisSim has developed an extensive library of pattern recognition and parameters analysis algorithms for studying of sea clutter.

For this research VisSim has developed a Video Extractor Module, which acquires radar data with a high sampling rate (up to 100 MHz) and delivers raw digitized radar video for different radar video processing applications.

The technology we are using for acquisition of radar signals allows us to perform several types of processing based on the same radar, e.g. tracking targets for VTS purpose, detecting Oil Spills, calculating wave parameters, etc.

The Wave Parameters Measurement module is based on raw video from commercial X-band radars, independent of the make. Typical suppliers of these types of radars are: Sperry Marine, Furuno, Raytheon, GEM, Terma, Atlas, etc. Preferable antenna size is 6 ft or above.

The following screenshot shows automatic waveheight detection from an installation on Norways west coast.

Real-time information about the sea state, such as wave height, direction and period, is crucial for coastal protection, as well as off-shore operation management (e.g. oil platforms or ships).

In the last 30 years routine sea state measurement were carried out mainly using moored wave buoys. Although such devices provide reliable measurements they are easily subject to damage and loss. Therefore considerable interest has been shown lately in the use of remote sensing techniques to measure waves and surface state. In contrast to buoy measurements, which are based on the analysis of the buoy motion using accelerometer and tilt sensors, radar measurements of the sea state are based on the analysis of the temporal and spatial evolution of the radar backscatter information, received in the near range of the radar (sea clutter).

   
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