Sunnyvale, California
January 1982
"DynaSoar may be long gone, boost-glide is still out there, going strongly." Story England was smiling. "Heard of SWERVE and LORAINE, Owen ?"
"Let me guess. More hypersonics, for strike ? Like the old BGRV in the 1960's... or Silbervogel 50 years ago ?"
"Nope. For interception of Soviet bomber packages. As in, the Navy Outer Air Battle.
"What do you mean ? Ain't AEGIS and Tomcats / Hawkeyes taking care of that ?
"Actually, it is the next step beyond them. A missile with an hypersonic glider at the tip.
"Do they plan a nuclear warhead ? Because otherwise, guidance will be a nightmare.
"No nuclear warhead. They are confident they can handle the guidance issues. If true, this could bring a revolution to the perenial issue of bomber interceptions: after guns, jet aircraft, SAGE and guided missiles of every kind: AEGIS, Phoenix."
"So at the end of the day, unlike Aegis and Tomcats those... boost-gliders would attack Soviet bombers from above: from space. Accelerating to extremely high mach numbers and altitude.
"And distance too. Which is the key parameter of Outer Air Battle."
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In 1977, DoD began a program known as BIM - Ballistic Intercept Missile - to develop wide area target acquisition and engagement using ballistic missile propulsion concepts.
By 1982, DoD had chosen a maneuvering reentry vehicle known as SWERVE as the vehicle, and conducted studies to develop sensor subsystems.
By 1985, three successful sensor tests had been conducted with the SWERVE vehicle.
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Sandia Winged Energetic Reentry Vehicle Experiment (SWERVE) is not a DARPA program; it is a DoE technology program that DARPA has taken advantage of in its efforts to design a Ballistic Intercept Missile (BIM Program: FY 1979-1984) and to develop a conformal X-band array seeker (LORAINE Program: FY 1985-1987).
Over the last three years, both Navy and Air Force studies highlighted the need for SWERVE technology for fleet air defense and Air Defence Initiative missions. NASA sees SWERVE spinoffs for the National Aerospace Plane program, hypersonic research and for Mars missions, too.
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This Trans-Atmospheric Vehicle (TAV) aerodynamic design uses a 4.4 degree half angle biconic cone and is similar in geometry to the Sandia Winged Energetic Reentry Vehicle Experiments (SWERVE) conducted during the mid 1980s. Four wedge shaped hypersonic control surfaces are located around the vehicle's boat-tail at 90 degree intervals.
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SWERVE Flight Test Experience
Sandia designed, developed, and conducted three flight tests of a slender hypersonic vehicle called SWERVE. The first flight test occurred in 1979 and the last in 1985. All vehicles flown were spherically blunted conical vehicles. The cone half-angle in all cases was 5.25° and the third vehicle was a little over 100-in. long. The nose tip radius to base radius ratio was about 0.07. Small wings and elevons were used to increase lift and provide control. The heat shield and nose tip were ablative materials.
The vehicle was flown out of the Kauai Test Facility and, in the case of the third flight, reentered near Johnston Island. Extensive wind tunnel testing produced a large database on this shape. The SWERVE maneuver from the third flight included a -10° angle of attack, Mach 12, high-altitude pull out at 20 sec, requiring control deflections of 4°; followed by a return to 0°-angle of attack at 60 sec at about Mach 8.
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A DARPA program known as LORAINE (Long-Range Intercept Experiment) seeks to demonstrate that maneuverable reentry vehicles can destroy airbreathing targets at extremely long ranges. Anthony Tether, director of DARPA's strategic technology office, said that LORAINE is using as a test bed a vehicle called SWERVE. LORAINE involves adding a "conformal" radar array - one that does not disrupt the vehicle's aerodynamics - to the SWERVE, along with a high-speed signal processing system that uses the Sandac computer.
LORAINE, if successful, will make SWERVE autonomous, capable of zeroing in on moving targets without any external command. Tether said that such a weapon could be used to strike bombers and surveillance planes.
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PROJECT DESCRIPTIVE This effort in the Long Range Interceptor Experiment (LORAINE) Focus of the LORAINE program has been on development of technology for a non-nuclear very long range anti-aircraft weapon. The development is intended primarily for Battle group and Continental United States (CONUS) air defense applications.
By virtue of its speed the LORAINE could attack in a matter of minutes. By having a large search area the LORAINE minimizes the need for accurate pretargeting information, and coupled with its speed of reaction eliminates the need for update information in most scenarios. It is ideally suited to complement long range surveillance systems such as Over-the-Horizon (OTH) Radar and Space Infrared (IR) systems. These latter systems can be used to cue the LORAINE.
LORAINE can also be used to provide the outer air defense for the Battle Group. In short, the LORAINE is the ultimate long range intercept weapon. The baseline reentry vehicle was developed by the Sandia National Laboratory.
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At the most ambitious level, the outer air battle attempts to integrate all available fleet air defense assets to destroy Soviet bombers before they can launch their weapons. The requirement was first stated about 1983, and at least two generations of studies have been conducted, with work by several contractors carried out during 1986.
Throughout, the question has been the extent to which a new ship-launched missile should share the outer fringes of the battle group with long-range fighters. In the past, any such sharing has been avoided because of limitations inherent in both IFF (identification, friend or foe) and in maintaining aircraft tracks. On the other hand, particularly after they have been fitted with vertical launchers, surface ships have an enormous missile capacity, compared to airborne fighters. In 1986 there were reports of LORAINE, a long-range antiaircraft missile developed by the Defense Advanced Research Projects Agency (DARPA).
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The United States Navy created their own system, the AN/TPS-71 ROTHR (Relocatable Over-the-Horizon Radar), which covers a 64-degree wedge-shaped area at ranges from 500 to 1,600 nautical miles (925 to 3,000 km). ROTHR was originally intended to monitor ship and aircraft movement over the Pacific, and thus allow coordinated fleet movements well in advance of an engagement. A prototype ROTHR system was installed on the isolated Aleutian Island of Amchitka, Alaska, monitoring the eastern coast of Russia.
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Another proposal was to use technology then under development for a maneuvering re-entry vehicle for ballistic missiles. Relocatable Over-the-Horizon Radar defined a series of resolution cells (each quite large); it could only say whether a bomber was or was not in each cell. Normally a cell would be far too large for a missile's active seeker to search, which was why ROTHR was considered a surveillance tool rather than a fire control sensor. However, a sensor on board a missile approaching the bomber stream from above, ie from space, might view the entire resolution cell. It turned out that a ballistic missile, LORAINE, could be fired from a standard vertical launcher cell, and plans called for equipping its manoevering re-entry vehicle with a millimetre-wave radar. The weapon would dive so fast that the bomber would have little chance of escaping. The space aspect of the system would have been the high-capacity link betwee ROTHR and the firing ship.
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"The only air defense system that utilized a ballistic missile I can think of is the Ballistic Intercept Missile (BIM) that the Navy is studying for application in their Outer Air Battle plan.
Even with systems like Phoenix/AWG-9/APG-71 and AEGIS/Standard Missile, the USN thinks that their air defense capability would be insufficient against massed Soviet bomber formations that they thought the USSR would utilize in a potential conflict.
So the USN began investigating a air defense system that would look down on Soviet bomber formations from above to destroy them, rather than a standard air defense system where the air defense system looks up to find the bombers, and this became BIM.
BIM was a ballistic missile that would launched from a containerized launcher and would release the SWERVE vehicle in a high lofted trajectory. From its high lofted hypersonic trajectory, the SWERVE would look downwards searching for Soviet bomber streams with its powerful LORAINE active seeker, and if it found any, would maneuver to destroy the bombers."
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"Damn interesting stuff; you guess I was wondering how rocketplanes would fit into this. Seems pretty obvious that the Air Force could use ROLS as a SWERVE carrier. Takeoff, accelerates to Mach 3+ on the jets, then go suborbital. Once safely out of the atmosphere, roll on the back, open the payload bay doors, and release a number of SWERVE missiles. Reentering the atmosphere and boost-gliding to hypersonic velocity, they will use their LORAINE seeker to home on Soviet Naval Aviation bombers and wipe them out of the sky; thinning their ranks to help AEGIS and Tomcats in the fight for the Outer Air Battle. Ain't that an exciting mission ??!!!"
"Of course it is. By the way, if SWERVE is to be AEGIS sidekick the missiles will have to be sized for the Mk.41 VLS launcher: small and compact. Compare that to ROLS payload bay: it could carry a big numbers of SWERVEs."
"Holly cow. We could decimate entire squadrons of Tu-22M Backfires from space, long before the Outer Air Battle planned beginning. We could put AEGIS, Tomcats and Hawkeyes to retirement. I'm wondering whether my beloved NF-104Bs could play any testing role in that."