ARLINGTON, Va. – U.S. military researchers are asking two defense contractors to develop rugged RF radomes and infrared windows able to withstand the severe heat, shock, and vibration of hypersonic flight.
Officials of the U.S. Defense Advanced Research Projects Agency (DARPA) in Arlington, Va., awarded contracts this month to the Lockheed Martin Corp. Missiles and Fire Control segment in Orlando, Fla., and the Georgia Tech Research Corp. in Atlanta for the High Enthalpy Aperture Technology (HEAT) project.
HEAT seeks to demonstrate new material approaches and solutions to enable RF and infrared apertures on hypersonic missiles and aircraft to withstand extremes in heat and dynamic pressure. Hypersonic vehicles typically fly faster than five times the speed of sound.
Lockheed Martin won a $2.5 million HEAT contract on 11 Feb., and Georgia Tech won an $8.3 million HEAT contract on 3 Feb. The HEAT program is a classified effort, so Lockheed Martin and Georgia Tech must make use of their facility clearance licenses and use personnel with collateral secret security clearances.
Related: The electronics design challenges of hypersonic flight
High-speed aerospace systems like hypersonics require RF radomes or infrared windows to protect sensitive electronics from the environmental extremes of high-speed flight while providing transparency for radar and RF communications transceivers and infrared sensors used for guidance, communications, and sensing.
These aperture materials must withstand extreme thermal, mechanical, and chemical environments during hypersonic flight that can limit their performance. For example, shock waves and high heat loads can impose wavefront distortions and boresight errors on guidance electronics.
Solutions may involve affordable and manufacturable means of controlling thermo-optical and elastic-optical effects; maintaining desired transmission amplitude and bandwidth; and reducing thermal deformation, mismatch, and radiation.
The HEAT program is a four-year, two-phase effort, which is divided into three technical areas: integrated RF aperture materials; infrared aperture materials; and next-generation aperture materials.
Lockheed Martin and Georgia Tech experts will consider new materials approaches that combine metals, ceramics, and coatings into innovative high-performance structures, as well as new computational capabilities necessary to develop these materials.
The program's first phase will develop integrated aperture materials, and the second phase will involve ground testing. For more information contact Lockheed Martin Missiles and Fire Control online at www.lockheedmartin.com, or Georgia Tech Research Corp. at https://gtrc.gatech.edu/gtrc.
