The GMS is the key sub-system of the Integrated Fire Control System, used in MBT ARJUN Tank to engage ground targets. GMS is an integrated Day cum Night sight,Consisting of Day sight, Thermal Imager & Laser Range finder. The GMS system is coupled to a Fire Control Computer (FCC) and a Gun Control System (GCS) thus enabling the tank and the gunner to engage ground targets, irrespective of it being stationary or moving, by day as well as night with the tank itself either being stationaryor on the move.

FEATURES

GMS performs the following functions

• Surveillance
  The day channel enables the gunner to engage the line of sight on the desired targets during day & the thermal imager performs the same function during day or night.
• Display
  The micro monitor in the Gunner's Control and Display and the mini monitor in the Commander's Control Station enable the display of video signal from the thermal imager and inlay of system information such as Bore sighting parameters, Wear counters, Calibration parameters and reticule.

Calibration Parameters

• Bore sighting
  The system has necessary controls for performing bore sighting alignment of LOS with the Gun at 1100 m
• Muzzle Reference System
  This function allows for the automatic measurement of angular difference between LOS and LOF to compensate for misalignment of the gun with respect to the GMS. Gun barrel misalignment / bending is mostly caused by temperature effects of the sun or during firing
• Drift Compensation
  The automatic drift procedure is performed in GMS slaved mode and stab mode compensates for the complete drift present due to the gyro's, the earth's rotation and electrical variations in system, in particular the control handles Has a powerful BITE facility which is able to detect most of failures and displays the failed functions in the monitors. Besides1 the failure detection, the BITE performs safety actions, in order to preserve the system integrity incase of a major failure.

Digital Inter Communication System is a state of art equipment meant for intercommunication of crew members of Armoured fighting vehicles. It can provide interface support for accessing of radio sets by many crew members at the same time. It also supports for exchanging of digital data files from one crew member to other crew member through serial link. Data communication with other vehicles over Radio sets is also possible.

SYSTEM CONFIGURATION

The basic system components are

• Central Unit
• Crew Member Units
• Interconnecting Cables
• Helmet assembly

GENERAL DESCRIPTION OF DAVIS FUNCTIONS

The operation of the Digital Intercom System (DIS) is controlled from the Central Unit (CU) whereas all the Crewmember units (CMU) provide user interface functionality. CMU's work as User terminals and all the functions and features of voice and data connections, selecting the requested operator. The requested party receives a call by an indication on the CMU. The called person can reject or accept the call. If the call is accepted the system automatically establishes a connection between the parties and simultaneously removes them from the "INTERCOM" conference. When the call is rejected the calling party will be informed by a red LED on the CMU.

• Radio Communication(Use of radios)
  DIS operators can use the radios in both voice and data transmission modes. DIS can interface with Analog/ Digital Radios of Tadiran HF and VHF radios, CNR Radio, R123 Radio, ANPRC radio. Radios can be selected for monitoring only or to receive and transmit. When the radio is selected in receive and transmit mode by the operator, he is disconnected from the conference mode and connected to the Radio. A radio can be selected by many operators in the tank, but only one operator can transmit at a time. Whoever presses the XMTR push button first, his voice is transmitted.
• Tactical Messages(TMS)
  DIS system enables all operators to send and receive Tactical Messages between the system operators either within the vehicle or outside using radios capable of data transmission. Operator can enter a text message up to 32 characters and select the destination of that message from the list of address programmed and send the message.
• Data Transmission
  The DIS central unit is equipped with a number of communication ports. Some of them can be used for a general purpose communication with external devices; some are dedicated to the control of digital radios only. Apart from this each terminal unit (CMU) is fitted with a serial asynchronous port that can send and receive communication streams. The system can freely route information between these ports and it can also process such information if communication protocols interpreter has been built into the system. For example it can receive position information from GPS/ALNS and distribute the position updates in human readable form to all operators' CMU screens.
• Crew Member Unit
  CMU has two main processors, DSP and FPGA. The total functionality is split and executed by both the processors. FPGA takes care of interface of Keypad commands, Alarm inputs, OLED Display, reading of keypad data, Control of volume using PGA and communication with CU. The DSP processes MIC input and speaker outputs.
  Communication between DSP and FPGA is done using EMIF interface. DSP reads MIC data and sends to FPGA and receives speaker data from FPGA and outputs the voice. FPGA reads all accessories and MIC data from DSP. All the data read are combined to frame a packet and is transmitted to CU. Similarly it receives packet from CU and decodes the data and outputs to the corresponding peripheral device. The data to be sent to speaker are transmitted to DSP through EMIF and DSP takes care of CODEC section.
  CMU has a 16pin connector in which either Alarm or Headset is connected. In this 8 alarm signals can be connected from external Unit. These alarm signals are fed to a A/D converter to take care of analog input. ADC chip is interfaced with FPGA through SPI interface.
  Switching and routing of voice and Data are managed and performed by the CU. The Central Unit can be connected to maximum of 5 Crew Member Units. Each Crew Member Unit can interface with max of 2 Helmets. The basic features of the DIS are Conference calls, individual calls, use of radios, tactical messages, data transmission, alarm signals monitoring, emergency broadcast.
• Conference (Intercom mode)
  DIS can establish a general (including all users) or selected users' conferences supporting all the operators and communication assets to speak and hear the other participants. When the system starts a general conference called "INTERCOM" is activated. All the operators can hear each other, this is a basic function of the system. When an operator selects an individual connection with other operator, he temporarily quits this conference.
• Selective connection (peer to peer)
  The DIS operators can establish individual connections freely; the purpose is to arrange a conversation that no one else can hear. Such connection can be established by
• Alarm signals monitoring
  Each CMU is fitted with a connector to receive alarm signals. Whenever an input to this connector is shorted to ground the system automatically distributes a warning message to all operators in speech form.
• Emergency Broadcast
  All CMU can detect and distinguish two active positions of the chest switch. One of them "XMTR" is used to force a transmission over selected radio, the other one "RING" forces a "broadcast" or general conference to all operators overruling all pending connection they might be involved into. As long as this position is selected everybody in the system can speak and hear everybody. This function should be used for emergency only.

The Advanced Land Navigation System (ALNS) is an equipment mounted in 'A' vehicles for the purpose of Land Navigation in featureless terrain. The equipment is used for traversing a path defined by coordinates of a military map. The ALNS guides the Commander as well as the Driver by dynamically updating the vehicle's present position and the bearing to the selected destination. The basic sensor used in the system is called Inertial Measurement Unit.

FEATURES

• The ALNS can be operated in three different modes as per the requirement. The three different modes are:
  • Inertial Mode
  • Hybrid Mode
  • GPS Mode

  In Inertial Mode Systems operates completely on the Inertial Sensor Inputs. In Hybrid Mode it takes the inputs from Inertial Sensor as well as GPS receiver and selects the most accurate data for calculations of Navigational Parameters. In GPS mode system is independent of Inertial Sensor Inputs.

• The ALNS is a RLG (Ring Laser Gyro) based navigation system
• It is completely independent of GPS when operated in Inertial Mode of operation
• It is having two different DISPLAY PANELS, conveniently fitted for the Commander and the Driver to view the navigational guidance provided by the system after processing the different inputs
• It is having PC Interface for Upload / Download of Navigational Data
• It can store various Navigational Data such as 500 Waypoints, 100 Roots
• The system is completely Menu driven.

Tank Intercom System, R-174 Mk-II, is meant for Intercommunication between crew members of a Tank. This can also be used for communication between the crew member of a tank with the crew member of other Tank through Radio. The system is designed for compatibility with Radio Sets R-173, CNR, STARS-V and TADIRAN.

FEATURES

• Internal two way communication between up to six users
• External two way communication over any of the three Radio stations of the vehicle
• Internal circular two way communication between all Users
• Listening to Ring tone from Radio
• Ringing external user over Radio
• Facility for selecting /controlling audio leak
• Special Audio tone for Laser Warning Signal

VHF Transreceiver – AFV Radio is a Software Controlled Frequency Hopping Radio in the frequency band of 30-88 MHz. The design of the Radio is based on Digital Signal Processor (DSP) and Direct Digital Frequency Synthesis (DDFS). The Radio works in Anti- jam Frequency Hopping and Fixed Frequency modes with built-in High Grade Digital Secrecy. The Radio support both Voice and Data communication. The Radio is specially designed for fitment in Armored Fighter Vehicles like T-72 tanks, BMP's and Truck/ Ground Role.

This Radio Set is Compatible with STARS-V MK-I and MK-II in FF Secure, FH1 & FH2

FEATURES

• DSP based Software Controlled Radio
• Frequency Range 30 to 88 MHz in 25 kHz channel spacing
• 2320 channels with 10 Preset Channels and 10 Hop sets
• Frequency Hopping : 250 Hops/ second
• Built-in encryption in Fixed and Frequency hopping modes
• Scan and BITE facility
• Hailing and Selective calling facility
• Automatic Re-broadcast facility
• Direct Serial Data Interface (RS 232-C)
• Modular Construction
• Built-in Co-site filter (at 10% freq with 2.5M antenna separation. At 15% freq with 1.5M antenna separation)

Instant Fire Detection and Suppression System (IFDSS) is a micro controller based fire detection and suppression system for vehicle/Tanks. The Equipment automatically detects the fire and suppression of fire is carried out either automatic or pressing manual override switch in crew as well as in engine compartment of the tank.

The detector unit have IR sensors and detects the fire in crew compartment and send the confirmation signal of fire to Main Control Unit (MCU) over Control Area Network protocol. The Main Control Unit (MCU) takes the necessary action to activate the fire Extinguishers.

A “Fire-Wire” is a flexible heat detecting wire, having one or more elements joined in series by means of various connector accessories. It is simply a linear Thermal Detector, which is directly interfaced with the Main Control Unit. It’s logic is designed for detection “Over Heat”, “Fire”, “Open Circuit” and “Short Circuit” conditions.

The system has feature of continuous health monitoring of Detector Units, Alarm and Flasher unit, Fire wire and Fire Extinguishers. The system also has the features like Built in Test facility (BITE) and Audio-Visual indication of “Over Heat” and “Fire” conditions in Engine compartment.

FEATURES

• Built in Test facility (BITE)
• Monitoring of Detector units, Fire Wire, Alarm & Flasher unit and Fire Extinguishers
• Simple Man-Machine interface (MMI)
• Environmental specification as per JSS 55555
• Easy maintenance and repair
• Low Power Consumption
• False Free Operation
• Auto cut off voltage below 18 V and above 32 V
• Electromagnetic Compatibility as per MIL Std 461C.
• Audio and visual indication of “Over Heat” and “Fire”conditions in Engine compartment.

Instant Fire Detection and Suppression System (IFDSS) is a micro controller based fire detection and suppression system for vehicle and Tanks. The system automatically detects the fire in the crew compartment and overheat / fire condition of the engine compartment. Suppression is carried out instantly by the system in two modes namely; Automatic and Manual.

IR sensors of the Detector Unit detects the fire in crew compartment and built-in control logic sends the confirmation of fire to Master Control Unit (MCU) using Control Area Network (CAN) protocol. MCU then activates the audio visual alarm and actuates the squib of fire extinguishers to extinguish the fire instantly.

Fire-wire used in Engine compartment, is a flexible heat detecting wire, having one or more elements joined in series by means of various connector accessories. It is simply a linear Thermal Detector, which is directly interfaced with the Main Control Unit. It’s logic is designed for detection “Over Heat”, “Fire”, “Open Circuit” and “Short Circuit” conditions

The system has feature of continuous health monitoring of Detector Units, Alarm and Flasher unit, Fire wire and on demand connectivity check for the Fire Extinguishers. The system also has the features like Built in Test facility (BITE) and Audio-Visual indication of “Over Heat” and “Fire” conditions in Engine compartment.

FEATURES

• Built in Test facility (BITE)
• Continuous checking/monitoring of Detector units, Fire Wire, Alarm & Flasher unit and Fire Extinguishers
• LCD display
• Data logging facility
• Real Time Clock
• Detection of fire within 50 ms
• Response time for complete fire suppression 150 ms
• Environmental specification as per JSS 55555
• Easy maintenance and repair
• Low Power Consumption
• False Free Operation
• Auto cut off voltage below 18 V and above 36 V
• Electromagnetic Compatibility as per MIL Std 461C.

BMP II Stabilizer System, 2E36-4, is an all electric drive system used for stabilizing 30 mm automatic gun, 7.62 mm co-axial gun (Machine Gun), mounted on the Infantry Fighting Vehicle (BMP-II). It controls the guns in both Traverse and Elevation for firing at the ground targets on the move and at halt.

The stabilizer provides the semiautomatic traverse and elevation laying when engaging aerial targets at halt. The commanders traverse target designation, make it possible for the commander and operator to operate twin gun mount.

It is having two modes of operations namely Auto and Aided. Aided mode is useful for aerial target at halt. Pulse width modulated H bridge configured amplifiers are used in each channel for driving the motors. As a result of stabilization, Gun retains the present orientation in space when tank moves over broken terrain, while tank hulloscillates vertically and horizontally.

FEATURES

• It is having facility for both commander and gunner to control Traverse and Elevation drive.
• TDD is there to align the target in Traverse by commander only.
• For both traverse as well as elevation it is having electric drive which is almost maintenance free.
• Interface with FCS will be provided.

WEAPON STABILISER SYSTEM FOR T-90S TANK

BMP II Stabilizer System, 2E36-4, is an all electric drive system used for stabilizing 30 mm automatic gun, 7.62 mm co-axial gun (Machine Gun), mounted on the Infantry Fighting Vehicle (BMP-II). It controls the guns in both Traverse and Elevation for firing at the ground targets on the move and at halt.

The stabilizer provides the semiautomatic traverse and elevation laying when engaging aerial targets at halt. The commanders traverse target designation, make it possible for the commander and operator to operate twin gun mount.

The stabilizer system (Article 2342-4) of T-90S is intended for stabilization and laying of the tank main gun and the paired co-axial gun in Elevation and in Traverse. It is designed to increase the effeciency of fire while the tank is stationary and also on the move for all types of ammunitions in real conditions of tank operation. It consists of Electromechanical Traverse Drive and Electro Hydraulic Elevation Drive

The Traverse system consists of

• Second Distribution Box (K2)
• Traverse Gyro assembled in gyro Unit
• Amplidyne
• Electric Motor

The Elevation system consists of

• Elevation Gyro assembled in Gyro Unit
• Angle Limiter
• Gun Setting Device (GSD)
• Feeder Unit
• Actuating Cylinder

Control Unit (K1) has PCBs for Traverse and Elevation operations separately.

During the movement of the Tank , if the gun under the influence of external disturbance is shifted from the earlier set value , then the power stabilization drives brings the gun to the initial position.

Any external disturbance acting on the Gun is sensed by the gyros and the error voltage is processed in control unit (K1). The out put of control unit is fed to the electromagnet windings of the actuating cylinder, wherein a differential current flows. This is converted into a suitable movement of the gun through the Hydraulic drive system consisting of Feeder Unit and actuating cylinder.

The traverse operation is also similar to that of Elevation except that instead of Hydraulic System, an Amplidyne & Electric Motor is used to rotate the turret.

FEATURES

• All Electric Drive is used for Traverse operation instead of Hydraulic Drive
• Solid State Electronics is used in Control Unit instead of Value Based circuits
• Continuous working up to 6 hours
• Simplified Units for Elevation Hydraulic Drive
• Weight Reduction form 320 Kg (T-72 Stabiliser) to 200 Kg

AERV is a tracked vehicle based system which can be used by Defence Forces for day and night land reconnaissance, water reconnaissance and navigation.

FEATURES

• Cross country amphibious vehicle
• Air conditioned Vehicle
• Central Computer to automatically store and print recce data

APPLICATION

• Bridge Laying by Defence Forces
• Finding river/canal depth, type of soil layer inside river, bed profile, water current etc
• Route Navigation using GPS and Inertial Navigation based systems
• Checking soil strength for vehicles mobility
• Measurement of home bank and far bank slope for rivers/canals

NBC RV is a tracked vehicle based system used by Defence Forces for NBC reconnaissance.

FEATURES

• Air conditioned and NBC sealed vehicle
• Central Computer to automatically store and print recce data
• Solid, semi-solid and liquid sample collection for analysis in the laboratory
• Weather station to find temperature, pressure, wind velocity & wind direction
• Route Navigation using GPS and Inertial Navigation based systems

APPLICATION

• Radiation contamination detection
• Chemical contamination detection
• Contaminated solid/liquid sample collection

The Air Defence Weapon Station (ADWS) is intended to lay and Stabilise the NSVT 12.7 mm machine gun along with the optical sensors in traverse and elevation mounted on the mobile platform. The system provides movement of the gun in traverse and elevation along with independent movement of the sight in elevation and with limited freedom in traverse.

The optical sensors include a day camera, Thermal imager and a Laser range Finder integrated on a single housing. The system allows automatic target tracking for air and ground targets and performs necessary ballistic computations to feed the ballistic offsets to the gun / sight.

Features

• Remote Firing & Automatic Loading
• DSP Based Brushless Servo Drive Technology
• 2 Axis Self-Stabilized platform.
• Day Camera & Night Vision
• Automated FCS & Ballistics corrections
• Automatic Target Tracking
• Adaptability to suit any armoured platform and various types of weapon system (12.7mm/7.62mm).

Kavach system creates a false target by launching a Chaff rocket during enemy’s surveillance and attack and this chaff will be misinterpreted as a target and hence protect the ship.

FEATURES:

• FCS comprises of the following modules
  • FCS Controller System
  • Launcher Control Unit 1, 2
  • FCS Simulator