PASSIVE CHAFF, COMPOSED OF HALF WAVELENGTH STRIPS, TENDS TO SLOW DOWN UPON REENTRY INTO THE ATMOSPHERE, LEADING TO A DOPPLER SHIFT FROM THE TARGET SIGNAL.

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 2157
Amount: $49,800.00
Phase: Phase I
Program: SBIR
Awards Year: 1985
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Srs Technologies
1811 Quail St, Newport Beach, CA, 92660
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 DR MONIEM EL-SHERBINY
 (714) 833-9088
Business Contact
Phone: () -
Research Institution
N/A
Abstract
PASSIVE CHAFF, COMPOSED OF HALF WAVELENGTH STRIPS, TENDS TO SLOW DOWN UPON REENTRY INTO THE ATMOSPHERE, LEADING TO A DOPPLER SHIFT FROM THE TARGET SIGNAL. TARGETS CAN THUS BE DETECTED BY RADARS THROUGH DOPPLER DISCRIMINATION AND THE CHAFF EFFECTIVENESS IS SUBSTANTIALLY REDUCED. ACTIVE CHAFF MAINTAINS ITS EFFECTIVENESS BY SPREADING ITS SIGNAL RETURN OVER A WIDER SPECTRAL BANDWIDTH THROUGH RADAR CROSS SECTION MODULATION OF INDIVIDUAL CHAFF STRIPS. THE TARGET RADAR RETURN IS THUS KEPT HIDDEN IN THE JAMMING SIGNAL SPECTRUM. THE PROPOSAL OUTLINES SOME APPROACHES TO ACHIEVE THIS EFFECT THROUGH DYNAMIC ACTIVE TERMINATION OF THE DIPOLES. THE CHARACTERISTICS OF CHAFF CLOUD RADAR RETURNS ARE DISCUSSED AND USED TO DETERMINE THE JAMMING SPECTRAL REQUIREMENTS. SEVERAL ALTERNATIVES ARE ANALYZED, INCLUDING MAKE-BREAK, VARIABLE REACTANCE LOADS AND TUNNEL DIODE-BASED ACTIVE CIRCUITS. PRACTICAL ISSUES INCLUDING POWER SOURCES, PACKAGING AND MEANS OF ACTIVATION ARE DISCUSSED IN DETAIL, TAKING INTO CONSIDERATION THE ANTICIPATED DEPLOYMENT ENVIRONMENT.

* information listed above is at the time of submission.

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