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Advance Light Towed Array Sonar (ALTAS)              numbers of USHUS-2 systems for replacement
     ALTAS is an efficient sensing system for        of the presently fitted Russian sonars onboard
                                                     submarines at a total cost of `440 Cr.
detection, localisation, and classification of
submarines operating especially in the below         The USHUS Augmentation for Reliability (TUSHAR)
surface layer ocean conditions. It is useful
in Anti-Submarine Warfare (ASW) operations                TUSHAR has been taken as a reliability
and is the apt sensor for warships to locate         improvement programme of already inducted
silent submarines capable of launching high-         sonar USHUS. This project is to be executed
speed torpedoes. During the year, satisfactory       in two phases. In Phase-1, critical sub-systems
completion of all technical trials was achieved.     or modules will be re-engineered, re-designed,
Post-trial data analysis was also completed.         developed, productionised, subjected to factory
System performance review was conducted by an        acceptance tests, integrated and tested with
expert committee. The performance of the sonar       one reference system. Upon clearance and user
in detecting and localising submarine targets        recommendation, in Phase-2, the TUSHAR sub-
was excellent. User Trials have been commenced       systems will be integrated with the onboard
in Oct 2017. The process for identification of a     system, set to work and HATs and SATs will
LSI has begun and ToT will be transferred for        be carried out.
production of the systems.
                                                          During 2017, the following activities were
                    ALTAS System Onboard INS Sharda  completed: (a) Developed Power Supply modules
                                                     (LTPSUs, SMPSs, Isolation Transformer & Capsule
USHUS – 2                                            Power supply) with better efficiency, improved
     USHUS-2 is a submarine sonar to be installed    reliability and maintainability. Production model
                                                     LTPSUs, Isolation Transformer & Capsule Power
onboard four EKM submarines considering the          supply shifted to Naval Dockyard, Mumbai (b)
long term requirements of the submarine arm          SHARC processor-based intercept sonar signal
and to combat the component obsolescence             processing hardware developed and tested. It
in the existing Russian sonars onboard these         was integrated in the reference system being set
submarines. Design and development of engineered     up in Naval Dockyard, Mumbai (c) TUSHAR
model of USHUS-2 is carried out in NPOL and          deliverable cabinets assembled, wired and
productionised at M/s BEL Bengaluru. During          sent to Naval Dockyard, Mumbai (d) USHUS
the year, two USHUS-2 systems completed              reference system setting up is in progress at
FATs at BEL and were dispatched to Russia for        Naval Dockyard, Mumbai (E) Development of
platforms undergoing refit. Stand-alone STW          Digital Test Signal Simulator (DTSS) hardware
of onboard electronics is completed. Wet end         interface is in progress at NPOL.
sensor array installation has been completed at
INS Sindhukesari in Russia. The installation of      Portable Diver Detection Sonar (PDDS)
electronic cabinets will commence shortly. USHUS-2
sonar was handed over to the Indian Navy on               NPOL is involved in the design and development
24th Mar 2017. Indian Navy has ordered four          of a PDDS system that is capable of detecting
                                                     small targets such as divers and diver delivery
                                                     vehicles in and around harbours. The system
                                                     will be deployable and retrievable as and when
                                                     required. During the year, the re-design of the
                                                     wet-end electronics of PDDS was completed and
                                                     a prototype was assembled. The development of
                                                     the sub-systems of first system is complete and
                                                     the integration is in progress. The deployment
                                                     system was modified so as to accommodate in
                                                     the deck of the ship. The test and evaluation of
                                                     the system was carried out in Dec 2017.

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