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Covert Underwater Communications

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N/A
Agency Tracking Number: 36004
Amount: $68,525.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1997
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
7923 Jones Branch Dr.
Mclean, VA 22102
United States
DUNS: N/A
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 James F. Forren
 (703) 734-3424
Business Contact
Phone: () -
Research Institution
N/A
Abstract

To evaluate the feasibility of using the VLF acoustic channel to achieve covert point to point communication Planning Systems Incorporated (PSI) uses a broadband Finite Element Parabolic Equation (FEPE) underwater acoustic propagation model. The model generates VLF channel transfer functions used to develop Equivalent Discrete-Time (EDT) filters. The EDT filters characterize not only the channel, but also the transmitter and receiver responses. The EDTs model the intersymbol interference (ISI) that occurs in digital communications over band-limited channels. They are used to simulate ISI effects arising from the transmission of phase shift keying (PSK) and quadrature amplitude modulation (QAM) symbol sequences over the VLF channel and to design ideal compensation techniques for the interference. The Phase I goal is to develop the design data required to develop real-time adaptive VLF channel characterization algorithms in Phase II. Among the issues to be addressed are: the definition of the channel stability; the maximum number of symbols that can be transmitted and still achieve reliable communication; and the maximum communications range that can be achieved.

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

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