Performance evaluation of Marple modified FBLP and MINNORM methods for angle of arrival estimation using real multipath active sonar data

In underwater passive listening, the high-resolution direction-finding methods which employ an eigendecomposition of the estimated covariance matrix, are likely to work satisfactorily, even at relatively low signal-to-noise ratio (SNR) if the sensor parameters and the wavefront are well-known. In the field of active sonar, the observation time can be low and the asymptotic properties of the eigenstructure methods not verified. This can be compensated by higher SNR which permits the utilisation of AR methods. The authors present the results of an experiment in a water dock with a solid cylinder suspended near the water surface. The investigated methods are Marple, MFBLP, and MINNORM. >