A system for close range sonar is provided. The system provides sufficient
warning to permit maneuvering to avoid a close encounter even in the
forward starboard/port regions, which have been problematic in the past
due to ownship noise. The system utilizes a hull mounted sonar array and
a towed sonar array which may be controlled in position to provide
sufficient separation of noise received by both sonar arrays such that
the noise is largely uncorrelated. The system utilizes beamformers for
each array to supply a cross-correlator section which is able to minimize
the ownship noise and maximize the signal thereby providing more time for
maneuvering. The system also provides a LOFAR display and other displays
that are highly sensitive to detecting close encounters.