(
opex (fr), oct.16)
The TARAMMAA project will enable the Rafale F4 to see even further ahead
The first radar to equip the Rafale in series production and developed by the Thomson-CSF group [now Thales] from a technology developed in the 1970s by the Radant company, the RBE2 [Radar à Balayage Électronique 2 plans] with passive antenna [PESA] was one of the most advanced of its time, not only because, unlike its predecessors, it combined air-to-air detection with terrain-following functions, but also because of its performance, thanks to the fact that it was able to be used in a wide range of applications, not only because, unlike its predecessors, it combined air-to-air detection with terrain-following functions, but also because of its performance, with computers capable of performing up to one billion operations per second, allowing the tracking of forty targets and the simultaneous engagement of eight.
Then, the RBE2 evolved thanks to the contribution of active antennas [AESA, for Active Electronically Scanned Array]. Without going into too much technical detail, such a radar integrates thousands of sensors called TRMs [Transmitter Receiver Modules], which increase both its reliability [thanks to the redundancy of the latter] and its performance, since it is more difficult to detect and less vulnerable to electronic jamming while having an increased detection range, including for targets with a reduced radar signature.
Indeed, according to Thales' description, the RBE2 AESA, which entered service in 2012, can detect and track "a very large number of air targets simultaneously, both downwards and upwards, for close combat and long-range interception of many land or sea targets, in clear or jammed environments and in all weather conditions". In addition, it provides real-time 3D maps for terrain tracking and "high-resolution 2D radar maps of overflown terrain for navigation and target designation". And with the long-range METEOR air-to-air missile, thanks to its extended detection capability, it allows the Rafale to engage targets beyond visual range [BVR].
However, the RBE2 AESA will obviously have a successor. And, as the specialist magazine Air Fan pointed out in its latest issue dedicated to the Rafale F4, the French Defence Procurement Agency [DGA] is working on it, via the "TARAMMAA" scientific and technical project [PST], for Technologies et architecture radar MLU multivoies à antenne active [Technologies and multichannel radar architecture with active antenna], launched as a continuation of the upstream study programmes [PEA] CARAA [Capacités accrues pour le radar RBE2 à antenne active] and MELBAA [Modes et exploitation large bande pour l'antenne active].
This TARAMMAA project focuses on improving the performance of the transceiver modules and on a new software and hardware architecture. Director of the Rafale programme at the DGA, the French Defence Procurement Agency (IGA) General Engineer Guilhem Reboul explains that the idea is to ensure that "part of the processing is done directly in the antenna itself and no longer in dedicated computers".
"It's very innovative," he says. He adds: "Gallium nitride [GaN] technology will be preferred for the antenna modules in order to allow new functions such as the interleaving of air-to-air and air-to-ground modes. Combined with enhanced processing capabilities thanks to increasingly powerful algorithms and computing resources, these modules will guarantee remarkable detection ranges and high resistance to jamming," in line with the Aero Electronic Warfare 2025 PST, which is preparing the Rafale F4 and... Rafale F5 upgrades.
Hence the priority given by the DGA to the establishment of a French gallium nitride industry, within the framework of the NIGAMIL programme [for "Gallium nitride for MILimetric applications"]. Indeed, this material is used in particular for the manufacture of high-performance integrated circuits operating at up to 100 GHz, which would significantly improve the power level, efficiency and therefore the compactness of radar systems, active antennas or electronic warfare systems.
In the meantime, explains Air Fan, the Rafale F4.1, currently under development, will have an RBE2 AESA radar equipped with a GMTI [Ground Moving Target Indicator] mode for the detection and tracking of ground targets [testing of this has been completed] as well as an improved SAR [Synthetic Aperture Radar] mode for the production of very high resolution radar ground maps. "For the crews, these developments will be a spectacular operational advance. /deepl