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Parameter estimation for non-cooperative multistatic sonar

: Michaelis, M.; Brötje, M.; Ehlers, F.

UA 2014, 2nd International Conference and Exhibition on Underwater Acoustics. Proceedings. Online resource : Rhodes, Greece, 22-27 June 2014
Rhodes, 2014
ISBN: 978-618-80725-1-0
International Conference and Exhibition on Underwater Acoustics (UA) <2, 2014, Rhodes>
Fraunhofer FKIE

The main task of multistatic active sonar is the localization and tracking of objects of interest (targets). Therefore, a precise knowledge of the position of the acoustic sources as well as of its own sonar sensor position and heading is mandatory for each receiver in the multistatic active sonar system. In this paper we consider a receiver consisting of an antenna array, which is towed by an autonomous underwater vehicle (AUV). If the AUV is exploiting non-cooperative sources neither the position of the source nor the time of a transmission is known in advance. Only rough estimates can be gathered at the signal processing stage. In this case it is necessary to improve the available knowledge over time. We assume here that the positions of some targets are known according to a given uncertainty. These targets can be fixed objects like wrecks or small islands. In comparison to solely processing the direct blast, additional information is obtained by evaluating the reflections from known targets. In this paper we discuss the potential of using these reflections for improving the estimates of the system parameters, in particular the positions of the acoustic sources and the times of transmission. We present an algorithm for automatic parameter estimation, which is based on the multihypothesis tracking (MHT) filter, and discuss results for simulated data.