Better radar performance also helps dominate the BVR battle. Dassault has noted that the Thales RBE2 electronically scanned radar on Rafale has a "track here while scan there" capability; for example, it can continue to track targets while searching another part of the sky. The Typhoon's mechanically scanned Captor radar always works in track-while-scan mode, because its performance is such that its search capability is ample when it is tracking known targets. 'Data adaptive scanning' technology allows the radar to refine its tracking of priority targets without wasted movements.
With better data from the radar, and a good chance to identify the threat BVR, the friendly fighters have both more time and more information to make decisions, sorting targets and committing forces - that is, assigning friendly aircraft and missiles to each target. This is what the US calls "information dominance"; the hostiles are still trying to sort out their targets, but there are already missiles in the air towards them.
Of the new generation of fighters, the F-22 and Typhoon will probably be in the best situation to avoid any return shots from the enemy. F-22 pilot Metz calls this 'cranking' - pulling a supersonic turn after firing a missile, forcing a hostile missile to maneuver with rapidly increasing line-of-sight rates. "Cranking after the shot always reduces the enemy's effective missile range, but a supercruise crank places the F-22 way outside an adversary's maximum range, even if it could detect the F-22," says Metz. Most fighters are relatively limited in their ability to maneuver at supersonic speed, but the F-22 (with a large wing area and immense thrust) and the highly unstable Typhoon are specifically designed to do so.
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•The datalink advantage
But the single biggest tactical advantage, particularly in the BVR fight, is a simple information-technology device: a datalink. At one level, a datalink is a harder-to-jam substitute for voice radio; but at another, it makes a group of aircraft appear almost telepathic.
Beyond any serious doubt, the Swedish Air Force (AF) has more experience with the operational use of datalinks than any other service in the world. Because of its proximity to the Soviet Union, the Swedish AF recognized that it was vulnerable to communications jamming, and initially adopted ground-to-air links for the J35 Draken in 1963-65. The system was so secret that it was cunningly disguised in the cockpit and could never be mentioned on voice transmissions. The first 'fighter link', including aircraft-to- aircraft two-way transmission, was also deployed secretly, aboard the JA 37 Viggen in the early 1980s. The system deployed aboard the Gripen builds on this experience.
The Tactical Information Datalink System (TIDLS) can connect up to four aircraft in a full two-way link. It has a range of 500km and is highly resistant to jamming. Its basic modes include the ability to display the position, bearing and speed of all four aircraft in a formation on a tactical information system, including basic status information such as fuel and weapons state. The Swedish AF has already proven some of the advantages of the link, including the ability to spread the formation over a much wider area.
A basic use of the datalink is 'silent attack'. An adversary may be aware that he is being tracked by a fighter radar that is outside missile range. He may not be aware that another, closer fighter is receiving that tracking data and is preparing for a missile launch without using its own radar.
But the use of the link goes beyond this, towards what the Swedish AF calls 'samverkan', or close-cooperation. One example is the use of the Ericsson PS-05/A radar with TIDLS. An Ericsson paper compares its application, with identical sensors and precise knowledge of the location of both platforms, to human twins: "Communication is possible without explaining everything."
"Radar-samverkan," the Ericsson paper suggests, equips the formation with a super-radar of extraordinary capabilities. The PS-05/A can operate in passive mode, as a sensitive receiver with high directional accuracy (due to its large antenna). Two PS-05/As can exchange information by datalink and locate the target by triangulation. The target's signals will often identify it as well.
The datalink results in better tracking. Usually, three plots (echoes) are needed to track a target in track-while-scan. The datalink allows the radars to share plots, not just tracks; even if none of the aircraft in a formation gets enough plots on its own to track the target, they may do so collectively.
Each radar plot includes Doppler velocity, which provides the individual aircraft with range-rate data. However, this data on its own does not yield the velocity of the target. Using TIDLS, two fighters can take simultaneous range-rate readings and thereby determine the target's track instantly, reducing the need for radar transmission.
•Anti-jamming techniques
In ECM applications, one fighter can search while the wingman simultaneously focuses jamming on the same target, using the radar. This makes it very difficult for the target to intercept or jam the radar that is tracking him. Another anti-jamming technique is for all four radars to illuminate the same target simultaneously at different frequencies.
The 14 two-seaters in the third and final Gripen batch are different from the JAS 39B trainer. The JAS 39D will be a dedicated information warfare platform with a redesigned rear cockpit. The flight controls are removed and replaced by large-format displays. The JAS 39D will host different levels of backseaters, including a dedicated radar operator who can control all the radar sensors within a group. The overarching mission is to achieve information dominance; that is, to ensure that friendly assets have the best information possible while destroying or jamming the enemy's information resources.
Sweden's plans for Unmanned Aerial Vehicles (UAVs) and Uninhabited Combat Air Vehicles (UCAVs) are based on the use of the datalink. With the link, a semi-autonomous UCAV can co-operate with a formation of manned fighters. Avoiding conflicts between the UCAV and other aircraft becomes a natural extension of normal datalink use; the UCAV can be used for tasks such as the suppression of enemy air defenses, and to identify targets at close range.
However, none of the experts consulted by IDR see a possibility that the UCAV will replace the fighter in the near future. There is no substitute for the situational awareness of the pilot, particularly in the complex three-dimensional air battle. On the other hand, it is also clear that the use of datalinks and long- range weapons will allow manned fighters to control much larger areas.
The process of tactical change - which is traditionally slow except in combat - should be accelerated by the use of full-mission, multiple-player simulators. "Traditionally, you fly the new aircraft like the old one until you figure it out," remarks a former F-15 pilot who now works on the Boeing JSF team. "It took us 10 years to employ the F-15 like an F-15, and not like an F-4." With simulation "we'll do the same in four to five years"
Fighter Tactics