This part shall put some more light on some of the unseen facilities of DRDO. Interesting part is all this facilities have been put to use in research for stealth characteristics of various platforms. Looks like India is gearing up for some serious research on it and meanwhile improvising existing platforms including these facilities.

Environmental Test Centre

CVRDE has created an Environmental Test Centre (ETC) for AFVs with a mission  to simulate adverse environmental conditions and to test AFVs as an integrated platform. The aim is to simulate the actual situationwhich will be prevailing in a battlefield scenario and the following tests can be carried out:
• High Temprature
• Low Temprature
• Humidity
• Solar Radiations and the specifications are as follows

• Volume : 1890 m³ (18 m x 14 m x 7.5 m)
• Temperature range : – 40 C to + 90 C
• Humidity range : 20 % RH to 95 % RH
• Solar radiation : 600 to 1200 W/m2

The climatic walk-in-chamber will enable entry and positioning of AFVs, like Arjun MBT Mk-I, Mk-II, ARRV, Arjun Catapult, Armoured ambulance, BMP variants, etc. AFVs can be tested with Engine ON static conditions. The entire operations can be programmed and automated using Programmable Logic Controller.

An anechoic chamber (an-echoic meaning “non-reflective, non-echoing, echo-free”) is a room designed to completely absorb reflections of either sound or electromagnetic waves. They are also often isolated from waves entering from their surroundings. This combination means that a person or detector exclusively hears direct sounds (no reverberant sounds), in effect simulating being inside an infinitely large room. They are used to judge the Electronic Stealth characters of a vehicle or aircraft.

(Anechoic chamber of Bharat Electronic Limited)


EMI/EMC Test Facility

EMI/EMC test facility has been established to enable compliance testing of electronic and electrical sub-systems of AFVs as per MIL STD 461 requirements. The facility includes a
Semi-anechoic Chamber (SAC), a Sub-system Testing Anechoic Chamber (STAC) and common control rooms. Some of the salient features of the facility are:
• Completely self-supported and modular chambers
• Support for testing platforms up to 70 tons
• Vehicle smoke extraction system enabling continuous testing of platforms powered by engine generator
• Turn table capable of withstanding 1.5 ton/m2 distributed load for evaluating sub systems
• Simultaneous sub-system and platform level evaluation using common control rooms
• Hybrid absorbers capable of withstanding 200 V/m fully lined on all the sides and ceiling
• Movable floor absorbers to meet full anechoic chamber requirements
• RF shielded sliding doors (SAC – 5 m x 6 m , STAC – 2.1 m x 1.8 m) with auto ramp for platform/ sub-system entry
• Fully air-conditioned facility with humidity control to suit absorbers/ equipment needs
• Waveguide vents and special interfaces to air-conditioning system
• Lights with electrical lowering/ lifting system
• Instant fire detection system
• Safety interlocks to avoid exposure of high field to personnel
• Remote audio/ video monitoring of chambers/ EUT
• Ducts for concealed RF and power cable routing

• High performance from 10 kHz to 40 GHz with conformance to IEEE 299 for shielding effectiveness, field uniformity, normalised site attenuation and SVSWR as per ANSI C63.4 and CISPR 16-1-4
• Automated test system capable of carrying out the following tests as per MIL STD 461 (Army, Navy and Airforce requirements):
* Radiated emissions – magnetic field from 30 Hz to 100 kHz (RE101)
* Radiated emissions – electric field from 10 kHz to 18 GHz (RE102)
* Radiated emissions, spurious and harmonic emissions up to 18 GHz (RE103)
* Conducted emissions on power leads from 30 Hz to 10 MHz (CE 101, CE 102)
* Conducted emissions from antenna terminals (CE 106)
* Radiated susceptibility – magnetic field from 30 Hz to 100 kHz (RS101)
* Radiated susceptibility – electric field from 2 MHz to 18 GHz (RS103)
* Conducted susceptibility at antenna ports to verify the effects of inter modulation, cross modulation and undesired signal effect (CS 103, CS 104 and CS 105)
* Conducted susceptibility, power leads (CS101, CS106)
* Conducted susceptibility, structure current (CS 109)
* Conducted susceptibility, bulk cable injection, 10 kHz to
200 MHz (CS114), impulse excitation (CS115), damped sinusoidal transients, cables and power leads, 10 kHz to 100 MHz (CS116).

Source: DRDO Bi-monthly Publication



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