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

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$49,977.00
Award Year:
1990
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
12201
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Amerasia Technology Inc
620-1 Hampshire Rd, Westlake Village, CA, 91361
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Teong C Lim
(805) 495-9388
Business Contact:
() -
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.

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