S. Peter Beerens

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A 0.25 /spl mu/m CMOS IC contains all analog and digital electronics required for a point-to-multipoint Bluetooth node. The circuit includes RF front-end and digital baseband processor, microprocessor and flash memory with software stack. The 41 mm/sup 2/ die has 15 dB noise figure and 2 dBm maximum transmitter output, and consumes 125 mW at 2.5 V during(More)
The influence of transmitted waveforms on the signal-to-reverberation ratio (SRR) of a low-frequency active sonar is analyzed both theoretically and experimentally. Reverberation experiments have been conducted during a sea trial in a littoral water environment in October 1999. The aim of the trials was to compare the performance of three classes of(More)
For a low-frequency active sonar (LFAS) with a triplet receiver array, it is not clear in advance which signal processing techniques optimize its performance. Here, several advanced beamformers are analyzed theoretically, and the results are compared to experimental data obtained in sea trials. Triplet arrays are single line arrays with three hydrophones on(More)
In the last two decades, low-frequency active sonar (LFAS) emerged as one of the most efficient tools for shallow-water antisubmarine warfare (ASW). Like any long-range active sonar system, LFAS produces a large amount of unwanted sea bottom echoes or clutter. These echoes give way to false alarms that increase the computational load of target trackers and(More)
Sound-recording acoustic tags attached to marine animals are commonly used in behavioural studies. Measuring ambient noise is of interest to efforts to understand responses of marine mammals to anthropogenic underwater sound, or to assess their communication space. Noise of water flowing around the tag reflects the speed of the animal, but hinders ambient(More)
Reliable localization of marine mammals using towed arrays is often required for mitigation, population density estimates, and bioacoustics research. The accuracy of the range estimates using towed arrays is often not well quantified. Triangulation methods using multiple hydrophones allow for fast range estimates but are sensitive to the species type,(More)
Disaster management has over the past couple of years experienced a major paradigm shift from hazard assessment that causes disasters once they have occurred to mitigating the effects of hazards by means of disaster risk assessment. Geo-information science particularly earth observation-based information plays an important role in all phases of disaster(More)
Anti Submarine Warfare (ASW) is more and more focused toward shallow water environments. Many complications have come up for ASW sonar performance as a result of this. The problem that is tackled in this article is the performance loss due to the shape and motion of the sonar during a maneuver. Standard beamforming in towed sonar arrays is based on the(More)
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