Thermal Microwave Signature of Rocket Exhaust Plumes

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9101-09-M-0007
Agency Tracking Number: F083-256-1429
Amount: $99,994.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: AF083-256
Solicitation Number: 2008.3
Small Business Information
Propulsion Science and Technology, Inc.
848 Town Center Drive, Langhorne, PA, 19047
DUNS: 165115390
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Charles Berman
 Senior Research Scientist
 (267) 276-0180
 charlie@propulsionscience.com
Business Contact
 Margaret Taylor
Title: Vice President
Phone: (267) 276-0181
Email: peg@propulsionscience.com
Research Institution
N/A
Abstract
A physics-based method for computing the passive microwave spectrum emitted by rocket engine exhaust plumes is proposed. Microwave emissions have an advantage over infrared for early detection of missile and rocket launches due to their superiority in penetrating through clouds, dust, and fog. The primary technical approach will be based on a well known model called bremsstrahlung, braking radiation, produced by the collision of free electrons with atoms, molecules, and ions in rocket exhaust plumes. This results in a continuum spectrum, in contrast to the line or band spectra of molecular species. A continuum spectrum is consistent with at least one detailed set of measured results. The Phase I program will validate aspects of the current bremsstrahlung model, include effects of the plumes index of refraction, and explore a number of absorption mechanisms.  A basic initial model will compute emission from complete plumes as a function of frequency, altitude, aspect angle, and propellant formulation. BENEFITS: The development of a physics based code to compute passive microwave emissions from rocket exhaust plumes will provide a modeling capability to those DoD and commercial entities requiring knowledge of RF signatures.  For example, the All-Weather Radio Frequency Launch Detection System (AWRFLD) being developed by the U.S. Army Space & Missile Defense Command/Army Forces Strategic Command, uses RF emissions to detect and locate missile launches in all weather conditions.  The results of this SBIR will provide a theoretical understanding of RF emission from missile plumes.

* information listed above is at the time of submission.

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