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RECENT DRDO DEVELOPMENTS

On-board Instrumentation System for Torpedoes

The Naval Science & Technological Laboratory (NSTL), Visakhapatnam, has designed and Instrumentation System for Torpedoesdeveloped an On-board Instrumentation System for Torpedoes with Anupama 32-bit RISC processor developed by ANURAG. This system performs pre launch communication; monitors health of the torpedo; executes exercise run logic; acquires and stores torpedo parameters; and operates aids for recovery of torpedoes. Earlier, data acquisition and storing was realised with one microprocessor while run logic recovery aids operation was achieved using microcontroller. In the present system, the tasks of data storage, run logic exercise and recovery aids operation is achieved with the help of single microprocessor. This unit not only reduces weight and size but also the number of connectors. The system acquires torpedo propulsion parameters like battery voltage; motor current and motor speed; target parameters like range, bearing, velocity, echo details; . torpedo control parameters like depth, course, roll, pitch  and their derivatives, etc. The acquired data is stored in non -volatile memory for further analysis .

The main features of the hardware are:

  • CPU Anupama 32-bit mode at 15 MHz
  • 4 MB program memory ,8MB NV memory for storage of data
  • 12 analog inputs at 100 KHz, 6 serial I0
  • Four, 16-bit timer and counter, 44-bit I0
  • 5 solid state relays for driving recovery aids
  • System on 96 pin BUS with single EURO height cards, and
  • Works on single power supply 28V (+5, +15 -15 V derived)

The instrumentation system was integrated with torpedo subsystems and has given satisfactory results during recent sea trials.

SPST Switch Technology

The Solid State Physics Laboratory (sspl) , Delhi, has made a major breakthrough in the field of Silicon Device Fabrication by developing SPST (Single Pole Single Throw) Switch Technology. Working of mm-wave switches, optimized at 94 GHz with state-of-the-art specifications have been successfully demonstrated. Such switches, so far were made of high resistivity <110> material which was extremely costly and not easily available. However, the developed switches of <100> material are easily available and are less costly. The performance of these switches was checked on the RF bench at sspl and has been confirmed by DEAL, Dehradun-the user laboratory.