SIGNAL PROCESSING FOR THROUGH-THE-EARTH COMMUNICATIONS

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$460,000.00
Award Year:
1985
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
991
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Green Mountain Radio Research
50 Vermont Ave Ft Ethan Allen, Winooski, VT, 05404
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Frederick H. Raab
(802) 655-9670
Business Contact:
() -
Research Institution:
n/a
Abstract
RELIABLE THROUGH-THE-EARTH COMMUNICATIONS (TEC) ARE NEEDED FOR COMMAND AND CONTROL OF DEEP-BASED ICBM SITES. THE REQUIRED DATA RATES CAN BE ACHIEVED BY USING BOTH SIGNAL CODING AND SIGNAL-TONOISE-RATIO (SNR) ENHANCEMENT TECHNIQUES. THE KEY SIGNAL-PROCESSING ELEMENTS OFJSUCHASYSTEM ARE: NOLINEAR PROCESSING (NLP), ADAPTIVE NOISE CANCELLATION (ANC), QUADRATURE-AMPLITUDE MOUDLATION (QAM), ERROR-CORRECTING CODING (ECC), AND DECISION-AIDED FEEDBACK (DAFB). NONLINEAR PROCESSING BY AN ADAPTIVE CLIPPER REMOVES MOST THE POWER CONCENTRATED IN THE IMPULSIVE SPIKES OF VLF NOISE. ADAPTIVE NOISE CANCELLATION COMBINES CORRELATED ELECTRIC-AND MAGNETIC-FIELD INPUTS TO MAXMIZE THE SNR. QAM AND ECC MATCH THE REQUIRED DATA RATE TO THE CHARACTERISTICS OF THE COMMUNICATION CHANNEL. DECISION-AIDED FEEDBACK ALLOWS THE OTHER THREE SYSTEMS TO OPERATE TOGETHER IN A NEARLY OPTIMAL MANNER. THE PROPOSED PROGRAM WILL DEVELOP A PRACTICAL AND NEARLY OPTIMAL TEC SYSTEM CONCEPT THROUGH ANALYSIS AND SIMULATION OF EACH OF THE SYSTEM ELEMENTS AND THEIR INTERACTIONS.

* information listed above is at the time of submission.

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