Maareech - Advanced Torprdo Defence System

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by Let-know

Introduction
“Maareech” is an Advanced Torpedo Defence System (ATDS) for surface ships. Maareech ATDS is capable of providing reliable defence mechanism against a possible torpedo attack by vintage as well as modern torpedoes. Maareech system has both torpedo detection and countermeasure capability. Core functions include automatic detection, tracking and alert of incoming torpedoes and decoying of acoustic homing torpedoes.
System Configuration
The MAAREECH system is used to detect, classify and offer countermeasures against an impending torpedo attack on the ship equipped with Maareech. The system consists of a linear towed receiver array with appropriate length for the detection of torpedo signatures, towed decoy module for decoying of torpedoes, tow cable, a hydraulically operated winch system for handling the array and tow cable, Hull mounted Array sensor data interface and on-board electronics and system Software for signal processing, display & recording of sonar information. Brief of each of these subsystems is given in the following sections.


Towed Array
This is a system which comprise of various modules arranged in a linear manner interconnected by underwater connectors. Each module has components housed inside a polyurethane hose. Typically a module has an array of hydrophones spaced as per frequency range, capable of detection, L/R ambiguity resolution, decoying by Towed Decoy and Fibre Optic conversion module for telemetry.
Tow Cable
Tow Cables are electro-optic-mechanical cables having electrical lines, Fiber optic lines, strength members and steel armour. Tow Cable is the life line of Towed Array Sonar, which connects the linear array which is towed behind the ship with the onboard electronics, through the winch system interfaces The tow cable execute the roles of transferring the operational tow load (drag force) to the winch, transferring power supply to the arrays and providing a data telemetry link and control the depth of penetration of the array. Typical length of tow cable is 500m

Winch System
The sonar winch is used for winding, unwinding and stowage of the array and cables. The winch is primarily hydraulically operated, and can be operated in electric mode in emergency (Fig. 2). A winch
control console located adjacent is used to control and monitor the operations of the winch. The system is embedded with various interlocks and safety features which facilitates even remote operation from sonar room.
Onboard Electronics (OBE)
This subsystem receives the data through a fibre optic data link from the array. The OBE executes all the processing on the data received and presents the sonar information in twin displays using state of art HMI schemes. Display cum processor cabinet houses processing electronics and displays. (Fig. 3). The displays have multiple pages that can be changed by the operator as required. The OBE also provides interfaces with existing Hull Mounted Array. The Digital Data Recorders (DDR) can be used to record sonar data, replay pre-recorded data and even plug in test data to the OBE for evaluation and training.
The data from the OBE is interfaced with Fire Control System to facilitate seamless triggering of expendable Counter measures. The Contact Motion Algorithm is used to predict the motion of incoming Torpedo.


MAAREECH ATDS Subsystem Parameters
Details of major subsystems of Maareech are given below
Wet-end subsystem
Maareech wet end subsystem comprise of the following
a) Towed Receiver Array
b) Towed Left Right Ambiguity Array
c) Towed Decoy Module
d) Fibre Optic (Conversion) Module (FOM)
e) Tail Rope
f) Electro - mechanical Connectors
g) Tow Cable integrated with FOM.
The Towed Array modules have typical diameter of 78mm and cumulative length of approximately 40m. The various elements are housed inside a flexible PU hose and is filled with a fluid. The modules Cable and Array wound on Winch Display Cum Processor Cabinet are interconnected using electro mechanical connectors. The Tow cable is terminated to FOM at the towed array end and Winch Rotor box at the winch end.
Winch subsystem
Maareech winch subsystem comprise of the following
a) Hydraulic Winch with secondary Electric drive
b) Hydraulic Power Pack
c) Control Valve Desk
d) Winch Master Control
e) Opto-Electrical Conversion Module
f) Electrical Slip ring
g) Load Sensing Unit
h) Fair Lead Assembly
i) Winch Remote Control
The system is designed for stowage of 500m tow cable and Towed Array. The Winch system can withstand up to 8000 kgf line pull. Maximum speed is 18 rpm. The system has various safety interlocks for preventing unintended operations. The Spooler system has auto and manual modes, has adjustable arrangements for passage of tow cable and towed array, and can be engaged/ disengaged easily. The system supports remote operation from Sonar Room.
Onboard Electronics sub system
Maareech Onboard electronics subsystem consists of the following
a) Display cum Processor cabinet (DcP)
b) Power Supply Cabinet
c) Hull Mounted Array (HMA) Interface Cabinet
d) Digital Data Recorder (DDR)
e) Isolation Transformer (IT)
f) Automatic Change Over Switch (ACOS)
g) Various Junction Boxes
The Display cum processor cabinet houses complete processing electronics of Maareech. Data is presented onto twin displays. Keyboard and Trackball interfaces are provided. Power supply is adapted for ship supply through Automatic Change over Switch and Isolation Transformer. The power supply and signals are distributed through various junction boxes fitted at different locations of the platform. HMA interface cabinet extracts pre amplified sensor data and converts it into Ethernet format for further processing at DcP. Ethernet links are used for Data and Control telemetry.
Software
The System software which resides on the on-board hardware modules implements advanced signal processing algorithms for torpedo detection classification and counter measures in active and passive mode. Exclusive rights for software will remain with NPOL.

  
                                                      


                                                                    (Above information are studied & verified from various sources available in internet) 

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