Air ASW Full Field Scattering
The US Navy uses multistatic acoustic sensor systems with Air Anti-Submarine Warfare (ASW) aircraft, supporting acoustic sources and receivers in a coordinated ASW search and surveillance mission against conventionally powered submarines operating in shallow water as well as all submarines operating in deep water.
Current systems suffer from high false alarm rates when operating in shallow water. The opportunity exists for optimally exploiting the full scattering field of the target's response to multistatic sources. Exploiting this full field scattering approach should improve sonar performance. Fusing together multiple echoes originating from the same target has the potential to reduce false alarm rates for the sonar system. There are several difficulties in using full scattering field detections.
One difficulty is that target motion effects may be required to eliminate some classes of clutter. Another difficulty is that target aspect information is needed to optimally combine multiple echoes. Signal Systems will use an optimal likelihood ratio tracker as a framework for exploiting the full scattering field effects available in Air ASW multistatic systems. This tracker will incorporate Metron Incís Bayesian target tracking technology.
We have developed a full field scattering detection method and evaluates its performance using at-sea data sets.
This research, if successful, will increase search rates and reduce false alarms in Navy multistatic sonar systems, such as Extended Echo Ranging (EER), Improved EER(IEER) and Distant Thunder.
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