Rajendra is a passive Phased Array Radar
Rajendra is a passive Phased Array Radar developed by the Indian DRDO. It is a multifunction radar, capable of surveillance, tracking and engaging low radar cross section targets. It is the heart of the Akash Surface-to-air missile system and is the primary fire control sensor for an Akash battery.
Rajendra, multifunction phased array radar, is the primary sensor at battery level for Akash SAM system - an air defence system for the Indian Army as part of Integrated Guided Missile Development Programme (IGMDP). The radar has the capability to perform extensive search, track multiple targets and missiles, and to command and guide own multiple missile concurrently. The radar system, mounted on two tracked vehicles – Battery Level Radar (BLR) and Battery Control Center (BCC), is
available to tactical forces for all types of operations with matching mobility. The radar has the flexibility to work in Group or Autonomous mode, and it has UHF communication facility to support Group mode of operation.
Current status
The Rajendra Multi-Function Phased Array radar system, designed at the Electronics and Radar Development Establishment (LRDE), part of DRDO, is currently in production at Bharat Electronics Limited. This is named after India's First president Dr. Rajendra Prasad.
The Akash missile is believed to have tail G/H-Band beacon to assist tracking by engagement radar. Guidance system is inertial with mid-course command updates from Rajendra and semi-active radar seeker for terminal phase (final 3-4 seconds).
The LRDE is working on the Rajendra III radar for the Indian Army. Rajendra III is a slewable phased array radar based on the T-72 chassis. As of 2007, the BLR-III vehicle on T-72 chasis was ready for a track test. The Phased array antenna is fabricated at Bharat Electronics Limited (BEL), Ghaziabad. Collimated beam pattern and s/s cure for all 16 spot frequencies has been taken.
Current orders for the Rajendra and its derivatives are at least 32 units, considering the order for 2 Squadrons of the Akash system by the Indian Air force and the indent for 28 Weapon Locating Radars by the Indian Army.
The Indian Doppler Radar (INDRA) series of 2D radar
The Indian Doppler Radar (INDRA) series of 2D radars were developed by India's DRDO for the Army and Air Force. The INDRA-I is a is a mobile surveillance radar for low level target detection while the INDRA-II is for ground controlled interception of targets.
Contents [hide]
1 INDRA-I
2 INDRA-II
2.1 Features
3 Current status
3.1 Current operators
3.2 System characteristics
4 References
5 External links
[edit]INDRA-I
INDRA-I is a 2D mobile surveillance radar for low level target detection. The radar is housed in two wheeled vehicles. Some of the main features are automated Track While Scan (TWS), integrated IFF and high scan rate for high speed target detection. The radar is produced by Bharat Electronics Limited and inducted into service. The INDRA-I was a landmark project for the DRDO, as it was the first large radar system designed by the organization and produced in number for the defence forces. The Indian Air Force operates thirty INDRA-I's whereas the Indian Army also has several.
[edit]INDRA-II
It is a variant of INDRA radar for ground controlled interception of targets. The radar uses pulse compression for detection of low flying aircraft in heavy ground clutter with high range resolution and ECCM capabilities. The radar has been produced by Bharat Electronics Limited and is used by Indian Air Force and Army. Seven INDRA-IIs have been ordered by the Indian Air Force.
[edit]Features
Fully coherent system
Frequency agility
Pulse compression
Advanced signal processing using MTD and CFAR Techniques
Track while scan for 2-D tracking
Full tracking capabilities for manoeuvering targets
Multicolour PPI Raster Scan Display, presenting both MTI and Synthetic Video
Integral IFF
Ease of transportation and fast deployment
The Central Acquisition Radar (3D-CAR) ROHINI & REVATHI variants
The Central Acquisition Radar (3D-CAR) is a 3D radar developed by DRDO for use with Akash SAM. The 3D CAR was developed as part of a program between DRDO and Poland's PIT to develop a family of mobile, S-Band 3D radars. The areas of cooperation were in developing the Planar Array and general architecture. The Indian variant is the 3D CAR, a medium range surveillance radar for Akash at Group level, intended to provide high mobility and comprehensive high and low level coverage. The Polish versions, are the TRS series of S Band mobile radars such as the TRS-17 and TRS-19. The original Indian (3D CAR) and Polish (TRS 17) radars shared the basic architecture and antenna but differed in terms of purpose designed transmitter/receivers, and signal processing equipment. The TRS series for instance can track 120 targets, while the Indian radar tracks 150.
India has further developed its 3D CAR into all new locally produced ROHINI & REVATHI variants. The ROHINI is the Indian Air Force specific variant whereas the REVATHI is for the Indian Navy. These replace the original joint development items such as the planar array antenna with new locally developed ones which are more capable than the original design. A third variant, known as the 3D Tactical Control Radar has been developed for the Indian Army and has cleared trials.
Details
The Central Acquisition Radar (CAR) is a medium range high-resolution 3-dimensional surveillance radar. The Central Acquisition Radar has been designed by LRDE, a DRDO laboratory, and is produced by a joint venture between BEL, Larsen & Toubro , Astra Microwave and Entec. The radar employs a planar array antenna and provides simultaneous multi-beam coverage. It can handle 150 targets in track while scan mode.
[edit]Rohini
The Rohini radar is mounted on a modified TATRA heavy truck and supported by a mobile auxiliary power unit. The TATRA is license manufactured by Bharat Earth Movers Limited (BEML).[1]
[edit]Features
These features relate to the 3D CAR radar. Specifications for the Rohini, 3D TCR and Revathi are available in the links below.
Medium range 3D surveillance
S band operation
Surveillance Range up to 180 km
Covers elevation of up to 18 km in height
High altitude deployability
Deployment in less than 20 minutes
150 Targets in TWS
Array of ECCM features
Integrated IFF
Capable of detecting low altitude targets, and supersonic aircraft flying at up to Mach 3
Frequency agility and jammer analysis
[edit]Current status
BEL anticipates a requirement for 100 Rohini radars. BEL delivered the first ROHINI to the Indian Air Force on August 6, 2008. Around 20 radars can be manufactured annually.[2]
The ROHINI has a new Indian-developed antenna which is more advanced than that on the original CAR terms of power handling and beam forming technology.
Seven Rohinis were initially ordered by the Indian Air Force for their radar modernization program. The IAF then ordered 30 more radars after evaluation, making total orders 37 of the type.
The IAF has ordered eight Akash SAM squadrons, and the ROHINIs act as the central early warning system for an Akash squadron deployment.
The Revathi adds two axis stabilization for operation in naval conditions, as well as extra naval modes.
Two REVATHI radars were ordered by the Indian Navy for their P-28 Corvette program. Given that the Indian Navy intends to have up to 4-6 P-28 Corvettes, further orders are likely from the Navy as well.
A Revathi derivative is believed to be on the Shivalik frigate as well, which would translate to 3 additional radars as three ships of the Shivalik class are being made.
Additional orders are also expected from the Indian Army if they order the Akash SAM system.
The Indian Army is also expected to order another 3D CAR variant. The third Indian developed variant of the 3D CAR is known as the 3D TCR or tactical control radar, with a tracking range of 90 km. The radar has a lower antenna mount and is packaged in two vehicles instead of three for the Rohini. It can also feed data to a weapons station 20 km away. The radar cleared trials in 2008-09 and is expected to be ordered in numbers.
Overall, the 3D CAR program highlights India and DRDO's success in developing and manufacturing a modern 3D radar.
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