SIGNAL PROCESSING FOR THROUGH-THE-EARTH COMMUNICATIONS

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 991
Amount: $460,000.00
Phase: Phase II
Program: SBIR
Awards Year: 1985
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
50 Vermont Ave Ft Ethan Allen, Winooski, VT, 05404
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Frederick H. Raab
 (802) 655-9670
Business Contact
Phone: () -
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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