SHORT RANGE COMMUNICATIONS

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N/A
Agency Tracking Number: 6516
Amount: $49,261.00
Phase: Phase I
Program: SBIR
Awards Year: 1987
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
80 Main St, Reading, MA, 01867
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 J ORGAN
 (703) 848-2550
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THIS PROPOSAL PROVIDES A NOVEL AND INNOVATIVE SOLUTION TO THE PROBLEM OF SHORT RANGE (UP TO 1000 YARDS) UNDERWATER COMMUNICATION UNDER VARIABLE SOUND PROPAGATION CONDITIONS. THE PROPOSED CONCEPT IS TO ADAPT THE FREQUENCY MODULATION FEEDBACK (FMFB) PRINCIPLE WHICH HAS BEEN WELL PROVEN IN MICROWAVE RADIO TRANSMISSION TO THE UNDERWATER ACOUSTIC ENVIRONMENT. AT THE TRANSMITTER, A WIDEBAND HIGH DEVIATION RATIO ACOUSTIC SIGNAL -AT A HIGH CARRIER FREQUENCY -WILL BE PROJECTED INTO THE WATER AND RECEIVED BY A SUPERHETERODYNE ACOUSTIC RECEIVER WITH A WIDEBAND "FRONT END". HOWEVER, A LOCAL OSCILLATOR CONSISTING OF A VOLTAGE CONTROLLED OSCIALLATOR (VCO) WHOSE VOLTAGE INPUT IS A FEEDBACK SIGNAL FROM THE FM-DETECTED WAVEFORM WILL PRODUCE A NARROWBAND INTERMEDIATE FREQUENCY (IF). THE WIDEBAND FRONT-END WILL HELP TO OVERCOME ACOUSTIC PROPAGATION ANOMALIES, WHEREAS THE NARROWBAND IF WILL RESULT IN GOOD THRESHOLD CHARACTERISTICS.

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

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