Projects

JSTARS – Joint Surveillance and Target Attack Radar System

The joint surveillance and target attack radar system (JSTARS) is a joint development project of the US Air Force (USAF) and Army which provides an airborne, stand-off range, surveillance and target acquisition radar and command and control centre.

Aircraft
Boeing 707-300 series aircraft, modified by Northrop Grumman
Designation E-8A for two prototype aircraft
Designation E-8C fro one test aircraft and all production aircraft
Crew
Standard mission - 21 (18 operators and three flight crew)
Long endurance - Crew of 34 (28 operators and six flight crew)
Length
152ft 11in
Height
42ft 6in
Empty Weight
171,000lb
Weight With Maximum Fuel
155,000lb
Maximum Gross Weight
336,000lb
Engines
4 x JT3D-3B turbojet engines from Pratt & Whitney
Thrust
18,000lb each
Maximum Airspeed
Mach 0.84
Service Ceiling
42,000ft
Range
11 hours
Range With In-Flight Fuelling
20 hours
Digital Data Links
Surveillance and Control Data Link (SCDL) for transmission to mobile ground stations
Joint Tactical Information DIstribution System (JTIDS) for tactical air navigation operation and Tactical Data Information Link-J (TADIL-J) generation and processing
Satellite communications link (SATCOM)
Voice Communications
12 x encrypted UHF radios
2 x encrypted HF radios
3 x VHF encrypted radios with provision for Single Channel Ground and Airbourne Radio System (SINCGARS)
Multiple intercom nets
System
24ft antenna, side-looking phased array
Scanned electronically in azimuth
Scanned mechanically in elevation from either side of the aircraft
Operating Modes
Wide area surveillance
Fixed target indication
Synthetic aperture radar
Moving target indicator
Target classification
Processors
3 x load-sharing programmable processors, each containing five high-speed, fixed-point distributed processors
Operation and Control System
1 x navigation and self defence workstation

The joint surveillance and target attack radar system (JSTARS) is a joint development project of the US Air Force (USAF) and Army which provides an airborne, stand-off range, surveillance and target acquisition radar and command and control centre.

In September 1996, JSTARS was approved for full-rate production for 14 aircraft, the last of which was delivered in August 2002. Three further aircraft were delivered between February 2003 and March 2005. The 116th Air Control Wing operates the JSTARS aircraft at Robins Air Force Base in Georgia. The 116th is a ‘blended wing’ with both air force and air national guard personnel.

Joint STARS Surveillance and Target Attack Radar System programme

JSTARS provides ground situation information through communication via secure data links with air force command posts, army mobile ground stations and centres of military analysis far from the point of conflict. JSTARS provides a picture of the ground situation equivalent to that of the air situation provided by AWACS. JSTARS is capable of determining the direction, speed and patterns of military activity of ground vehicles and helicopters.

JSTARS was first deployed in Operation Desert Storm in 1991 when still in development, and has since been deployed to support peacekeeping operations in Bosnia-Herzegovina and during the Kosovo crisis.

Eight JSTARS aircraft flew more than 50 missions in support of Operation Iraqi Freedom in March / April 2003.

On a standard mission the aircraft has a crew of 21 with three flight crew and 19 systems operators. On a long endurance mission the aircraft has a crew of 34, with six flight crew and 28 system operators.

JSTARS E-8C aircraft

The Boeing 707-300 series aircraft is the JSTARS airframe. The aircraft are remanufactured at Northrop Grumman in Lake Charles, Louisiana, then transferred to the Battle Management Systems Division in Melbourne, Florida where the electronics are installed and tested.

The propulsion system of the JSTARS aircraft consists of four Pratt & Whitney JT3D-3B turbojet engines, each providing 18,000lb of thrust. The aircraft has a flight endurance of 11 hours or 20 hours with in-flight refuelling.

In March 2007, Northrop Grumman was awarded a contract for the re-engining of the JSTARS fleet. The Pratt & Whitney / Seven Q Seven team was selected in January 2007 to provide the new integrated propulsion pod system including the P&W JT8D-219 engine.

Northrop Grumman began work on the first test-bed aircraft in May 2008 and the first flight of the E-8C JSTARS with the new engines took place in December 2008.

JSTARS airborne radar system

The radar system is produced by Northrop Grumman Norden Systems. A 24ft antenna is installed on the underside of the aircraft, which is mechanically swivelled and pointed to scan in elevation, and scans electronically in azimuth to determine the location and heading of moving targets.

“JSTARS provides an airborne, stand-off range, surveillance and target acquisition radar and command and control centre.”

The main operating modes of the radar are wide area surveillance, fixed target indication, synthetic aperture radar, moving target indicator and target classification modes.

The USAF awarded Northrop Grumman a contract to develop the next generation JSTARS as part of the radar technology insertion programme (RTIP). The new much more powerful radar will be an electronically scanned 2D X-band active aperture radar which will have a helicopter detection mode and inverse synthetic aperture (ISAR) imaging capability, as well as MTI (moving target indicator) mode, allowing real-time imaging of moving objects.

The weather radar system was upgraded in 2004-05.

In August 2017, Northrop Grumman was contracted to upgrade existing radio terminals and replace with air force tactical receive system-ruggedized (AFTRS-R) terminals.

Northrop Grumman received a $17.5m contract for fifth-generation upgrade to the central computers on 16 aircraft.

The USAF awarded a $330m contract to Northrop Grumman for total system support responsibility (TSSR) in November 2018.

Northrop Grumman received a $302m contract from the USAF to provide continuous support for JSTARS, in November 2019.

JSTARS command and control systems

JSTARS aircraft have 17 operations consoles and one navigation / self-defence console. A console operator can carry out sector search focusing on smaller sectors and automatically track selected targets. Fixed high value targets are detected through Synthetic Aperture Radar (SAR).

Signal processing techniques are implemented through four high-speed data processors, each capable of performing more than 600 million operations a second. Processed information is distributed via high-speed computer circuitry to tactical operators throughout the aircraft.

In 1997, the US Air Force awarded Northrop Grumman two contracts for a computer replacement program to take advantage of the latest commercial off-the-shelf technology (COTS). The program integrates new Compaq AlphaServer GS-320 central computers that are significantly faster than the original system.

The programmable signal processors have been replaced and a high-capacity switch and fibre-optic cable replaces the copper-wired workstation network. The first upgraded aircraft under the computer replacement plan (CRP) was delivered in February 2002 and the programme was completed in August 2005.

JSTARS aircraft are fitted with Force XXI Battle Command, Brigade and Below (FBCB2) ‘Blue Force’ tracking, which significantly improves the ability to locate and track the movement of friendly ground forces.

Communications of JSTARS

JSTARS has secure voice and datalinks to the army’s ground command and communications stations and to the air force command centres. Voice communications systems include 12 encrypted UHF radios, two encrypted HF radios, three VHF encrypted radios with provision for single channel ground and airborne radio system (SINCGARS) and multiple intercom nets.

The digital datalinks include a satellite communications link (SATCOM), a surveillance and control datalink (SCDL) for transmission to mobile ground stations, and Joint Tactical Information Distribution System (JTIDS). The JTIDS provides tactical air navigation (TACAN) operation and Tactical Data Information Link-J (TADIL-J) generation and processing.

The Cubic Defense Systems SCDL is a time division multiple access datalink incorporating flexible frequency management. The system employs wideband frequency hopping, coding and data diversity to achieve robustness against hostile jamming. Uplink transmissions use a modulation technique to determine the path delay between the ground system module and the E-8 aircraft.

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