Passive sonar system for distress localisation

PILOS 2.0 is a broadband passive sonar designed specifically for surface vessels to detect and track underwater noise and signals generated by sonar systems, emergency beacons and other acoustic sources. PILOS 2.0 significantly reduces the time taken to locate a submarine in distress by providing accurate bearing information and a large search radius, even on a rescue vehicle operating at high speed.

PILOS 2.0 is equipped with a sophisticated circular array providing full 360 degree coverage over a frequency range of 1 to 50 kHz. Through the use of a target tracking algorithm, it is possible to simultaneously visualise the bearing of multiple noise sources. In addition to the broadband trackers, PILOS 2.0 features frequency based narrowband trackers. These allow the user to specify a frequency range and to detect and track pingers in a selected frequency range only.

To further increase the chance of detecting an emergency pinger, even in the most noise polluted environments, PILOS 2.0 features a full-fledged frequency analysis system. The initial detection of slow pingers is supported by a transient analysis. Once detected, the pulse parameters are evaluated by the intercept processing and can be cross-referenced to the emergency pinger parameters.

PILOS 2.0 offers a detection range of up to 70,000 metres for signals generated by an emergency sonar beacon system (also available from ELAC SONAR). With the capability to receive underwater telegraphy and telecommunication signals, PILOS 2.0 is an indispensable asset to any search and rescue mission.

An integrated audio module operating on beam formed data supports the operator in classifying acoustic underwater signals. The signal received on an operator selected beam is transposed into the audible range around 800 Hz – equivalent to the highest sensitivity of the human ear. The audio channel can also be linked to a tracker. PILOS 2.0 offers a raw data recording capability. During playback all processing parameters can be changed. This feature is useful for training of the crew, analysis of data collected during surveillance operations or preservation of evidence during rescue missions. The transducer array is mounted on a hoisting gear and can be completely retracted into the ship’s hull. The hoisting gear is operated from within the graphical user interface. Direct access is only required for maintenance and installation.

The open-architecture-based middleware of the PILOS 2.0 reduces the burden on the customer to integrate additional functionalities. These can be developed by the customer themself or it might be
a 3rd party functionality from another supplier.