DEVELOPMENT OF LOW PROBABILITY OF INTERCEPT/ANTIJAM (LPI/AJ) MODEM

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N/A
Agency Tracking Number: 12201
Amount: $49,977.00
Phase: Phase I
Program: SBIR
Awards Year: 1990
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
620-1 Hampshire Rd, Westlake Village, CA, 91361
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr Teong C Lim
 (805) 495-9388
Business Contact
Phone: () -
Research Institution
N/A
Abstract
AN INNOVATIVE LPI/AJ (LOW PROBABILITY OF INTERCEPT/ANTI-JAM) MODEM IS PROPOSED FOR THE SECURED COMMUNICATION LINK BETWEEN U.S. MILITARY AIRCRAFTS. THIS MODEM UTILIZES SPECTRAL SHAPING AND DECEPTION (SSHADE) TECHNIQUE WHICH IS CAPABLE OF PROVIDING COVERT VOICE/DATA COMMUNICATIONS IN A HOSTILE JAMMING ENVIRONMENT. THE PROPOSED TECHNIQUE GIVE 40 DB OF PROCESSING GAIN BY SPREADING THE ENERGY OVER A 40 MHZ BANDWIDTH WHEN NARROWBAND (2.4 KBPS) DIGITAL VOICE ENCODING (LPC-10E) IS USED. PRELIMINARY TRADOFF STUDY SHOWS THAT LPC-10E PROVIDES LONGER CODE LENGTH THAN CVSD (CONTINUOUS VARIABLE SLOPE DELTA). THIS MODEM HAS THE POTENTIAL OF PERFORMING IN A -30 DB SIGNAL-TO-NOISE ENVIRONMENT. JAM RESISTANT CAPABILITY IS PROVIDED BY THE AVAILABLE 40 DB PROCESSING GAIN DUE TO SPECTRUM SPREADING. ANOTHER INNOVATION IS THE USE OF SURFACE-ACOUSTIC-WAVE (SAW) CONVOLVER FOR DESPREADING THE RECEIVED SIGNAL WITHOUT THE NEED FOR COMPLEX CODE SYNCHRONIZATION PROCESS.

* Information listed above is at the time of submission. *

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government