India's eyes in the Sky : Netra AEW&CS

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Part - 1

What is an AEW&CS?

AEW&C system is a potent force multiplier, providing surveillance, tracking, identification and classification of the Airborne/Sea surface targets. The information from multiple sensors are collated, associated and fused to provide a cogent and comprehensive air situation picture on configurable consoles. Further capabilities include threat assessment and enabling the interception of the hostile targets through guidance of own interceptor.

Introduction
The development of an indigenous Airborne Early Warning and Control System (AEW&C) was taken up by DRDO & IAF in 2004.
Development of indigenous AEW&C system as a mission mode programme commenced with Centre for Airborne Systems (CABS), Bengaluru, as the nodal agency. After the sanction of the programme, IAF revised the operational requirements in tune with their emerging war fighting scenario. The revised operational requirement necessitated building of an AEW&C system on a small aircraft with all the systems and functionalities similar to that of the bigger AWACS being procured by IAF. DRDO took up the challenge and has made the system a reality.
The AEW&C aircraft is a derivative of Embraer ERJ-145 extensively modified and customized to house the indigenous mission systems developed in India. The complete integration of the mission system and its flight evaluation has been carried out in India. One of the main features of the aircraft is that it is the Embraer executive jet aircraft to have air to air refueling.

The system was envisaged to have full net centric capability through multiple LOS and Satellite Communication Data links, on-board Mission Computer, which enables the operator to carry out the information fusion, mission control, and reconfigurable operator consoles for the operator to interact with the system and exploit the system capabilities in tune with the operational environment.

The AEW&C system is a system of systems having primary radar (PR), secondary surveillance radar (SSR), electronic support measure, communication support measure (CSM), ‘C’- Band Data Link (CBDL), ‘Ku’- Band SATCOM data link (KBDL), V/UHF communication link working in the microwave region.
The Indian AEW&C system is versatile in choice of the sub-systems and its capabilities.

Equipment's

• Active Electronically Scanned Array for Primary Radar (PR)
• Fully indigenous, electronically scanned antenna based MK-XII(S) and mode 4 capable Identification Friend or Foe (IFF) System.
• Electronic Support Measure (ESM) and Communication Support Measure (CSM) for detection of hostile air defenses
• Satcom & line of sight Voice and Data Communication System
• Self-protection Suite (SPS) consisting of UV-based Missile Approach Warning Sensor (MAWS) and Radar Warning Receiver (RWR).
• Mission Communication System for Air-to-Air, Air-to-Ground V/UHF voice
• Satellite-based Non Line-of-Sight Communication and Data Link.
• C band Line-of-Sight Communication and Data Link.
• V/UHF voice only communications system
• Five Operator Workstation and Five rest crew seats, Reconfigurable Operator Work Stations.
• Extendable Endurance with In-Flight refueling (IFR)
• Dedicated APU's for Mission Avionics
• Fuel Efficient Regional Jet aircraft platform
• Tactical Battle Management Software
• Mission Computer

All the above systems are electrically and functionally integrated through a high speed LAN and complete suite of tactical software fully developed in house. This software provides functionalities such as multi sensor tracking and data fusion, multi target tracking, identification and classification, system control and monitoring interception and battle management functions, all of which are developed in house. A comprehensive Human Machine Interface again developed in house, projects the real-time air situation picture, into five reconfigurable consoles, in a manner required by the individual operators. In addition to the airborne complement, five major ground systems supporting all aspects of planning, training, maintenance, and integration with IAF Command and Control Centre also have been developed fully indigenously.
These are:

• Mission Planning and Analysis Station (MIPAS), which enables multiple operators to plan their mission on AEW&C simultaneously. Additionally a laptop-based mobile MIPAS also have been configured and provided.
• Ground Exploitation Station, receives the information from the aircraft and communicates the information to the IAF Command and Control Centre.
• Operator Training Station, which enables up to 8 operators to be trained simultaneously on all aspects of operation of the AEW&C.
• Automated Test Equipment, which enables first level of maintenance through automated test process.
• Mission Software Support Facility, a software repository to maintain the software versions through life of AEW&C.

All of these are backed by a regular post development support project taken by CABS to enable operational and maintenance support to the IAF for a period of three years.
The AEW&C system has undergone extensive flight evaluation flying close to 1500 hrs (700+ sorties). These include flying at Bengaluru, evaluation campaigns at various IAF bases such as Jamnagar, Bhatinda, Jodhpur, Gwalior, Agra, Chabua to state a few. Evaluation of the system also includes evaluation through conduct of Large Fleet Engagement exercise (more than 25 of them) to evaluate the complete performance capabilities of the AEW&C command, control, battle management, etc. The AEW&C system is being integrated with the IAF’s Command and Control System.

Specifications
Range: 250-300km (475km in super extended mode)
Aircraft range: 2700km
Service ceiling: 37000ft
Maximum speed: Mach 0.8
Total TR modules: 160 TRMM with 8 TR modules in each TRMM (Total 1280 TR modules)
AAAU Dimensions: 8.2m X 0.9m X 0.5m

Netra Long Range Tracking Ability​

Sensor arrangement
In AEW&C, the real estate available on board the aircraft is limited and hence antennae are to be kept in close proximity to each other. On the exterior of the AEW&C aircraft, there are 89 antennae and sensors located in a cramped condition. In addition, aircraft body being metallic, the individual antenna radiation pattern gets distorted due to ‘body effect’. Hence, prior knowledge of the individual antenna radiation pattern alone cannot help while selecting suitable locations on the exterior of the aircraft for various antennae. Moreover, aircraft safety being of the highest priority, the ideal location requirement from antenna radiation pattern point of view has to take a back seat. The first step toward location identification is to predict the antenna radiation pattern with ‘body effects’. For this, one has to resort to any of the computational electro-magnetic methods. Commercial tools such as E-Mind have been used for this. This exercise is recitative and time consuming. Depending upon the number of locations tried for each antenna, one generates voluminous data.
In general the antenna location process went through the following steps:

• No location on the control surfaces.
• No location that affects air flow over the control surfaces.
• No location that blocks the air in-take.
• No location that leads debris into the engine during bird strike
• No location that interferes with aircraft controls.
• No location that does not have structure to support the antenna
• No location that burns the other mission system front- end
• Preferably locations not affecting the cooling for other mission systems
• Preferably locations not affecting field of view of other mission systems
• Preferably locations not affecting the performance of other systems.

The location of the SATCOM radome adjusted forward to allow sufficient air for the active antenna array unit located in the rear under all ‘angle-of-attack’ conditions. Similarly, the AAAU itself was moved forward to avoid damage from a possible broken engine blade leading to a flight hazard. Additional fins had to be added to stabilize the aircraft under ‘side-slip’ conditions as there was a blockage of air to the control surface.

Diagram of working of AEW&C system

Active electronically scanned array radar
Active Antenna Array Unit (AAAU) is a major as well as critical component of the AEW&C system and has been indigenously developed.
AAAU is an active electronically scanned array (AESA)-based radar having more than 1,000 elements producing several tens of kilo watts of power.
The AAAU is mounted on dorsal side of the aircraft fuselage using four pylons. Being an external structure of an aircraft with the dimensions of 8.2m X 0.9m X 0.5m, it qualified stringent airworthiness requirements.
AAAU structure is designed for aerodynamic loads, inertia loads and aero-elastic requirements. The mechanical design of AAAU is designed considering easy accessibility for various electronic components (LRUs) inside the AAAU. The fool proof design of AAAU caters for antenna structure, thermal, microwave electronics & digital electronics. Wind tunnel tests and CFD studies were conducted for the AAAU to optimize the aerodynamic shape of front and rear hood and to estimate the internal and external aerodynamic loads. Structural tests such as Modal Analysis Test (MAT), Static Strength Test (SST) and Ground Vibration Test (GVT) were conducted and validated with Finite Element Analysis.
Internal design is made to optimize the cable routing, for accommodation of front end electronics of primary & secondary surveillance radars and cooling of them.
This design, using ram air for cooling the electronics inside the AAAU, reduces the burden on the cooling system virtually to one third and consequently the power that is required for cooling is also reduced. The front hood and antenna panels were structurally optimized, tested and certified for bird impact requirements specified in Federal Aviation Regulation (FAR– 25).

AEW&C Active Electronic Array Antenna

AAAU in PNFM facility.

The radar offers multifunction, multi-mode capability with highly agile beam steering and electronic beam stabilization by the array.
Radiating interface, the major subsystem of the PR Active Electronically Scanned Array (AESA), is first of its kind. To obtain higher sensitivity, the AAAU is designed with high power transmit capability and also achieved ultra-low side lobe level in the receive mode.
The AAAU array has been developed with amalgamation of analog and digital electronics, microwave & electrical technologies. Its sophisticated electrical power distribution system comprises multiple safety measures. The performance of the array is maintained by in-situ calibration system.

 

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Part - 2

Critical building blocks that supports all functional requirements of the radar and serves as heart of the AAAU system are TRMMs.
The TRMM’s have RF and digital manifolds to accommodate the size and weight due to its unique design. The unique design of integrated antenna aperture for both primary and secondary surveillance system along with cladded radome reduces the weight and volume constraints. This uniqueness has also helped in bringing out the microwave losses thus making it a win-win from both structural and electronics aspects. With the aid of several stages of RF distributer and combiner networks, single RF signal input is fed to all elements of planar array. The received signals from all elements are combined by the TR modules and stages of RF combiners.
To achieve the command & control of installed LRU’s of AAAU system a controller has been devised with required hardware and software. The unit accepts the control and commands information from central unit/IFF SP/MSC through specific interfaces and distributes the same to AAAU LRU’s.

DRDO-designed S-band TRMM

AAAU Exploded view

Astra Microwave-assembled TRMMs

The bottom portion of the AAAU contains the Multi-output power supplies (MOPS) that require more cooling than the TR modules that are placed in the middle. The internal airflow for each of the 160 Transmit-receive multi-modules (TRMM) should be not less than 15 CFM even under blockage conditions due to the presence of SATCOM radome under all pitch- and yaw-conditions. To assess the required quantum of airflow, wind tunnel tests were carried out apart from CFD analysis. The system has about 2 km length of RF cables in the air passage.

 

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Part - 3

Safety against bird strikes is another vital requirement for AAAU being a large airborne antenna system. The criteria are such that after the bird strike, there should not be a cause for any flight-safety concern. The debris from a damaged antenna beyond a certain size, for example, should not be able to enter the engine.
A carbon composite front hood with aluminum mesh and aluminum slotted array are designed for such a criterion. Apart from transient analysis, actual test is also conducted with frozen bird of 4-pound weight.

Bird-proofing front hood of AAAU

Another special requirement for the airborne antenna is that it has to pass the lightning test for both direct and indirect effects. After zonal analysis, the lightning attachment points are identified and provided with paths for lightning to pass through without causing any structural damage. The indirect effects can be equally damaging like direct effects on items like the TRMM with sensitive electronics. The lightning must be discharged as much as possible by limiting the current flow in the skin. A waveguide slot array is best suited for this environment. Similarly, the SATCOM radome in the lightning prone zone has button/strip type lightning conductors to retard the lightning effect.

Lightning test

Being external to the fuselage, the cross section of the AAAU perpendicular to the aircraft flight path should be minimal to have low additional drag. Hence, a low drag design was done by designing the antenna panels as integral structural parts of the AAAU and eliminating the need for an additional protective radome. This has not only reduced the drag but also the total weight of the AAAU.
After analysis, four antenna panels were joined to form a lager single panel to enhance torsional rigidity. FEM analysis was carried out on and found to be meeting the FAR-25 requirements.
The most critical technology element for the radar is the Transmit-receive multi-module (TRMM). Design of the TRMM was carried out in the microwave lab and evaluated in detail. The most difficult part of the design was thermal management of the components in the TRMM without giving rise to hot spots by usage of ram-air-cooling.

RF cables in the AAAU.

AAAU in Rail Track Rocket Sled facility

 

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Part - 4

Secondary Surveillance Radar
Secondary Surveillance Radar (SSR) is another important sensor in AEW&C system used for detecting targets, identification as a friend or foe while working in tandem with Primary Radar (PR). This information is very vital in the wartime and is also useful to form database during peace time surveillance.

SSR system also called Identification Friend or Foe (IFF) system in military terminology comprises of an interrogator fitted with the main radar system on airborne platform and a transponder fitted on target aircraft. It operates as per the recommendations of the International Civil Aviation Organisation (ICAO) and STANAG 4193.
The interrogator transmits pulsed signal in a particular mode of interrogation in a specified direction. Aircraft fitted with compatible transponder receives the interrogation signal and replies back in the form of another coded signal to the interrogator for processing and identification. The reply provides additional target details such as height, range and azimuth, and target status like communication failure, emergency and hijack. Mode 4 is an encrypted mode of operation that enhances its capability to be secured, jam resistant and resistant to spoofing. Operation in Mode S (level 2) gives capability of selective addressing and data link capability, which are very critical in dense air traffic.

Based on the requirements of the user and platform constraint, the high power airborne IFF MK XII(S) interrogator has been developed for the AEW&C programme with a range of more than 475 km using modular approach. It comprises of Electronically Scanned Antenna Array (ESAA), solid-state transmitter, dual channel monopulse receiver and signal processor.
All the LRUs of IFF system have been qualified as per the MIL-STD 810E/461E/704D and certified for airworthiness by CEMILAC, and has been thoroughly tested in System Test & Integration Rig. More than 700 user evaluations were carried out by AFPT and ASTE including Large Fleet Engagement (LFE) sorties at various places in India. Formal ATP has been carried out by the IAF task team. Two IFF systems with adequate spare have been inducted into the IAF.

Identification Friend or Foe (IFF) MK XII (S) with Mode 4 Capability

Secondary Surveillance Radar components

Operator Work Station
The face of the AEW&C system through which the operators interact with the Mission Systems onboard is the Operator Work Station (OWS).
An operator deals with complex and large amounts of data and OWS provides better data organization, processing and distribution of actionable information, improving efficiency and reducing the reaction time
CABS in house developed OWS provides the operator a real-time display of the integrated tactical air situation picture on a powerful and ergonomically designed HMI, which enables the operators to gain a better situational awareness of the region under surveillance. There are rugged and lightweight five front facing airborne qualified operator consoles onboard.
Each OWS receives tracks, plots and emitter data from radar, IFF, ESM & CSM systems via the Mission System Controller (MSC) and provides an Air Situation Picture (ASP) to the operator. The OWS has a lightweight map engine capable of rendering both vector maps and raster maps. It supports multiple projection and coordinate systems and allows the operator to select the map layers such as coast lines, roads, and towns of his choice. To aid in operations the data received through the sensors are presented to the operator in different formats like symbols, textual windows, histograms, spectrum display, waterfall display etc.

The OWS provides capability of initiating interception of a hostile target, reception of the interceptor guidance solutions and commands from the MSC, facility for manual correlation of radar track data with ESM/CSM emitter data. It provides operational control facilities to all the AEW&C systems through keyboard and mouse. Emergency/Warning indications are provided via onscreen messages & audio beeps.
The OWS receives the health information periodically from all sub-systems, via MSC and provides a comprehensive health status display of the systems onboard.
Capability to view and monitor different areas of surveillance are provided through multiple Picture-in-Picture windows. Various tools help de-clutter the workspace and manage more electronic data.

 

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Part - 5

The five airborne qualified operator consoles comprise a 24 inch rugged LCD display integrated with a chassis housing multiple Intel-based Single Board Computer (SBC).

The OWS has an audio interface through a control panel that enables the operator to access all the communication channels with press of a button while simultaneously operating the display along with headset and integrated speaker. A foldable desk with a keyboard & mouse, knob-tilting arrangement for the monitor, reading area with transparent glass, light for reading during low visibility, pedal control with PTT switch are some other features of the consoles.
The operator consoles are designed as per the MIL-STD1472F ergonomics. The design also considered, in consultation with the Indian Institute of Aviation Medicine, the ergonomics of operators. The seats are adjustable according to the height and can be tilted. A two level adjustable foot rest facilitates operators with different heights to carry out operations.

Each of the five operator consoles are software reconfigurable to work in one of the six modes according to the role of the operator who is operating on it.
The 6 modes of operation are:
• ASP/ C2
• ASP/C2 + CSM
• ASP/C2 + ESM
• Global Air Situation Picture (GASP) Reconstruction & Playback
• Image & Voice Playback(IVPB)
• Onboard Training mode.

Data Handling and Display Systems

Facility is available to the operator to switch modes as per operational requirements. This allows the operator to view the information according to his requirement. The ESM and CSM operators have been provided GUIs that provide more information on their respective sensors in the ESM and CSM mode. The data along with audio and video of each OWS is recorded and stored for analysis and playback.
The GASP mode provides a reconstruction of the entire mission and allows the operator to interact with the display. The IVPB mode provides an audio video replay of the mission. The operators can playback at various speeds, pause and bookmark various entities of interest. The two different playback modes provide the operator with unique and enhanced tools to analyze data post mission. It helps them to further fine-tune their strategy and to suggest further improvements to system.
The requirement to meet the audio video recording of the mission is catered to by a recording unit. The Onboard Training Mode provides the operators facility to designate instructor and trainee consoles for providing training onboard during the mission. Along with the onboard training mode, several training sessions have been provided by the CABS team to the command and control operators to train them on the system.
Close to 1,000 hours of development flight testing of OWS had been carried out, Air Force has also carried out extensive evaluation of the system under realistic operational conditions and through simulated exercises at various bases including large-fleet engagement exercises.

AEW&C Cockpit

AEW&C Control Room

Operator Workstation

SATCOM Radome for AEW&C
Satellite Communication (SATCOM) is one of the sub-systems of AEW&C system and is mounted on the top of fuselage of the aircraft.
A radome protects the antenna from environmental effects in addition to transmit and receive electromagnetic radiations. This radome has been designed and developed by CABS and manufactured by a private partner. Radome meets MIL-R-7705B specifications. Electro-magnetic (EM) design of the radomes meets Ku band (for SATCOM) frequency 10.7 to 14.5 GHz radiation requirements. The radome is designed to withstand aerodynamic loads with minimum deflection under critical aerodynamic loading conditions. It is qualified for lightning protection as per MIL-STD-1757A and also meets bird strike requirements as per FAR 25.571 (e) (1).

The size of SATCOM radome is 2702 mm x 703 mm x 563mm which is, as of now, one of largest GFRP radomes developed indigenously. The weight of the radome is about 20 kg.
Aluminium alloy AA6061T6 strips are bonded in a specific pattern on the radome surface for lightning protection. Radome is also protected with special radome paint.

Satcom radome

 

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Part - 6


GROUND COMPLEMENTS OF AEW&C

System Test Integration Rig
AEW&C System being a System of Systems poses greater challenges in integration, This gets even more challenging when these systems have to work in tandem to form an integrated system. The complexity increases when the same is to function in an airborne environment where there are constraints in terms of volume, power, cooling etc.
The System Test and Integration (STIR) facility ensures a smooth integration and necessary clearances from the stakeholders before being put on the aircraft to reduce both the time and costly flight testing of the systems.
This facility is equipped with simulators for checking the system for mechanical, electrical, digital, RF and software integration and providing an integrated environment for tandem working of the system. The Rig also facilitates in terms of carrying out the behavior of the systems under various scenarios and environment that the mission is likely to encounter and caters for the stress testing of the system

Mission Planning and Analysis Station
The Mission Planning and Analysis Station (MIPAS) is a critical ground based system which supports pre-and post-mission activities of the AEW&C. The main task of MIPAS, at the pre-mission phase, is to prepare the Mission Parameter Data (MPD) Library to be uploaded to the AEW&C system. The uploaded MPD library serves as the technical and operational online database during the mission. The pre-mission phase outcome, which is the MPD library (a single MPD is for a specific, single mission sortie), consists of Pre Flight Messages (PFM) files and Tactical Mission Data (TMD) files.
Each MPD consists of PFM for the subsystems, which include Radar, IFF, Mission Data Processor (MDP), CSM Communication Support Measures (CSM), Electronic Support Measures (ESM), Self-Protection Suite (SPS), Intercept Control Processor (ICP), Mission Recording and Playback (MRP), Operator Work Station (OWS), and Communication PFMs (V/UHF, C Band and SATCOM).
TMD consists of Tactical Data Item (TDI), Weather Data, Mission Order, Mode Code Table, TYCO (Type and Configuration) and GRT (General Rule Table). Tactical Data Item include Fixed Points (like Airbases, Navigation aids, Radar sites, Surface to Air Missiles sites etc), Areas (like Defended areas, Danger zones, Flight corridors etc), and Flight Plans of known aircraft.
The PFM and TMD files are needed for the initialization and operation of the airborne mission systems in a specific mission scenario. In a mission sortie, AEW&C generates and records various sensor data (like ESM, CSM), voice, video, RT calls, and navigation data. All this recorded data is required to be decoded and analyzed to improve the performance in future missions. For each sortie these recorded data and video recordings of each operator consoles is very huge. These voluminous data needs to be analyzed in short time. During post-mission, MIPAS supports data download, playback, analysis and report generation based on the downloaded data from the AEW&C. Facility to feed simulated data is also available.

Ground Exploitation Station
The Ground Exploitation Station is a transportable field deployable system, which can receive the information from AEW&C system both through a LOS and Satellite Data Links. The GES can be located in remote locations, thereby enabling the availability of the air situation picture around them in real time.
The Ground Exploitation Station (GES) acts as an interface between the AEW&C and the IACCS. The real-time Recognizable Air Situation Picture (RASP) generated onboard AEW&C is transmitted to the GES, which is, interfaced with the IACCS through an interface unit for dissemination of tactical information to the decision makers on the ground. Similarly, the command from the IACCS to the AEW&C is routed through GES.
GES enables the officers to see live sensor data collected by the onboard AEW&C sensors. All this visualization happens on ground (in GES)/Mission Control Room (in IACCS room).
The Communication between AEW&C and GES can happen in one of the three modes: CBDL Data link; Ku Band Data link; and V/UHF communication system. The communication between GES and IACCS happens through Ethernet link. Once the sensors data is on IACCS network, it provides seamless availability of the information at any place across India.
GES, being a modular design, is easy for transportation and deployment. Multiple GES can be operational at the same time and the live sensor data can be monitored at different geographical locations. It comprises of mission system such as, Mission System Controller (MSC), Mission Communication System (MCS), C Band & Ku Band Data Link system and Operator Work Stations (OWS). All these systems are powered through a Diesel Generator (DG) system. As an entity it comprises of the following shelter / trailer based units, namely GES shelter, DG shelter, trailer mounted CBDL outdoor units, trailer mounted KBDL units and 18m VUHF antenna masts.
GES facility has been established at CABS as well as at Air Force Station Bhatinda, Air Force station Jodhpur and Air Force Station Ambala. The main components of GES are as follows:

GES Operator shelter: - houses all the indoor LRUs of mission system. It has been designed to accommodate four racks (for fitment of LRUs, UPS and batteries), two operator work station consoles, one CCTV console and a power distribution panel. Racks are fitted with various mission system LRUs like system controller, base band units, tracking receivers, antenna control unit, radios, high power amplifiers, VAIU etc.

C Band Data Link Trailer: - is fitted with a 1.8 meter dish antenna; with two feed (Main feed & Acquisition Aid Antenna). The antenna is fitted on a scissors lift; the scissors lift aids in the operation of the antenna at an elevated level.
The CBDL trailer also houses a drive control unit, a RF system, a dehydrator and a scissors lift motor.

Ku Band Data link trailer: - is fitted with a 2.4 meter dish antenna with its offset feed. The KBDL trailer houses a RF system consisting of Block Up Converter (BUC), Low Noise Block Down Converter (LNBC), and Electronic Compass. Four hydraulic jacks are provided for the trailers, which aids in meeting pointing accuracy of ground KBDL antenna towards satellite. VUHF Masts has two 18 meter masts fitted near the shelter. VUHF antennas are fitted on top of these two masts, which help in attaining maximum range for communication.

AEW&C Ground Exploitation Station-Operator Shelter

Components of Ground Exploitation Station

Operator Training Station
Operator Training Station (OTS) is a ground-based system for training the operators in a realistic, simulated environment for providing tactical training, command & control and battle management by simulating the behavior of different airborne sensors under dynamically varying scenarios.
It aids in providing hands on training to fighter controllers and judging the operational competence of the squadrons. It not only trains the operators in simulated scenarios comprising of Computer Generated Forces (CGF) but also by recreating previous mission sortie’s recorded large scale integrated exercise scenarios and thus providing exponential benefits. The facility enables enormous cost saving of training in flights of high value asset mission platforms such as AEW&C, thereby conserving precious flying missions. This facility has been extensively used by the Fighter controllers/ Mission Operators for training under different battlefield scenarios on ground. The OTS has capability to train either five Mission operators with five instructors controlling each one of them or one Instructor, training nine mission operators simultaneously.
It also has capability of simulated pilot sitting on IOS controlling its own simulated entities. OTS basically comprises of the Instructor Operator Station (IOS), Trainee Operator Station (TOS) and Server Rack

Automated Test Equipment
The maintenance philosophy of the AEW&C system is maintenance at three levels, namely, I (Intermediate), O (Operational) and D (Depot).
'O' level maintenance tasks are performed at the operational base mostly in-situ for all the systems. CABS has designed & developed Automated Test Equipment for testing Mission System LRUs for 'I' level maintenance of AEW&C.
The purpose of the ATE is to provide the simulating input to the LRUs and measuring the response based on which decision can be made, whether LRU can be declared as OK or not. The testing of the faulty LRUs off loaded from the Mission System is also done in ATE. It also carries out tests on spare LRUs to the required level of confidence prior to mounting into the Mission System. The ATE comprises modular and standard commercially-off-the-shelf test equipment interconnected through PXI/PXIe/GPIB bus and also through a fully managed Ethernet Switch.
Excitation and measurement is done by the test equipment in the ATE through ITA. The ATE software is built on industry standard platform- NI LabVIEW and NI Test Stand.

Principal elements of the Airborne Radar Test Bed

Mission Software Support Facility
The Mission Software Support Facility (MSSF) is one of the Ground Segment of AEW&C and is used to provide software maintenance and configuration management of the AEW&C system. The AEW&C system software is maintained at CSCI (Computer Software Configuration Item) level in the MSSF facility. The MSSF is used as a secure and centralized repository to store the software work-products of AEW&C sub-systems. The advantage of such repository is to make available all the software for AEW&C at a single place over the life time of the system. A Software Configuration Management server is used to store the software work products.

 

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Part - 7

The way forward : Netra Mk 2
With the induction of the indigenous AEW&C into the Indian Air Force, DRDO moved forward to the next generation system development for the Services, for which preliminary technology initiatives are already well underway.
In Netra Mk 2 project Defense Research Development Organization (DRDO) will develop six Airborne Early Warning and Control System (AWACS) aircraft for the Indian Air Force.
For this project 6 Airbus A320 will be acquired from Air India.
To modify the aircrafts for mounting the sensors and AESA radar DRDO will send the aircraft to its European manufacturer. Netra Mk 2 will be a scaled-up variant of the Netra Mk 1 AEW&C.

Netra Mk 2 will use GaN based TRMs, and will have more than twice the range of Netra Mk 1. Given that A320 is a bigger platform than ERJ 145, DRDO can use bigger radar package with more transmit receive modules(TRM).
The new AAAU will have a weight of approximately 3 tonnes and dimensions of 9m x 1.2m x 0.9m which is nearly double than that of the Netra Mk-1 AAAU



According to CABS 1st Netra Mk 2 will start to be handed over to IAF by 2028.
Netra mk2 will cover 300°, The radar configuration will have Two active antenna array unit (AAAU) assembled back-to-back and mounted on top of the fuselage with an additional nose mounted Radar unit.
Netra Mk2 will be able to detect low observable platforms from long distances, and will be able to perform better in intense EW environment.

Netra Mk-2 model at Aero India 2021

Possible Radar Antenna of NETRA MK2

 

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MORE PICTURES ​

AEW&C spectral coverage.

Comparison of AEW&C systems based on ERJ 145

Mission Computer

RTDU Unit

RWR, MAWS, CMDS, ESM systems

Netra Aerial Refueling

 

[Faceless]

@MirageBlue @Nilgiri Any info on what happened to the A330 based AEW&C(I), the one with the circular radome.
It seems unwise to me to scrap a project DRDO had put in such a substantial amount of effort in.


Infact if I am not wrong this AEW&C variant even had DAC approval

https://www.hindustantimes.com/india-news/air-force-set-to-get-two-more-warning-systems/story-KC4gyG7wnY3gfXnl26cqUO.html

 

[Faceless]

Highly Informative video presentation on Netra Mk-1

 

[Oscar]

There was a capability on the Netra not related to search or tracking that had folks across the border nervous - and its not listed here.

The capability was developed with help - very analogous to one on the Eitan.

 

[Sharma Ji]

There was a capability on the Netra not related to search or tracking that had folks across the border nervous - and its not listed here.

The capability was developed with help - very analogous to one on the Eitan.

Eh ? enlighten us please.

Thanks.

 

[Pingle]

We are like a Mexico or Argentina when it comes to Air power against our enemies..... No serious numbers of Awacs, refuellers EW crafts and dwindling squadron nos....

IAF goes out loud for purchase but always comes back with a very small quantity end of the day.... I am sorry for going off topic but this is just a frustration.....

 

[Oscar]

Eh ? enlighten us please.

Thanks.

not just ESM