Coherent Multi-Static Active Sonar LRT

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-04-M-0029
Agency Tracking Number: N032-0204
Amount: $99,739.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: N03-226
Solicitation Number: 2003.2
Small Business Information
P.O. Box 787, Severna Park, MD, 21146
DUNS: 958055055
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Laurence Riddle
 (410) 431-7148
Business Contact
 Laurence Riddle
Title: President
Phone: (410) 431-7148
Research Institution
Multistatic sonar technologies are emerging as an important strategy for addressing passive ASW sonar-performance shortfalls. Multistatic operations can potentially improve ASW effectiveness in challenging shallow-water environments while allowing critical assets to remain acoustically covert or at a safe standoff distance. The Navy uses multistatic acoustic sensor systems with aircraft and surface ships, in a networked-centric ASW search and surveillance missions. Current incoherent systems suffer from high false alarm rates when operating in shallow water and potentially alert the target by using explosive sources. A method of reducing false alarms and not unnecessarily alerting our adversaries is needed. Coherent active sonar systems offer greater duty cycles, are not confused with weapons deployment when transmitting, and enable Doppler processing. The combination of higher duty cycles and controllable waveforms hold the potential for reducing false alarms. SSC and its teammate, Metron Inc., proposes to utilize Likelihood Ratio Tracking (LRT) to optimally combine multiple echoes, detect and track multiple targets using low signal to noise (SNR) threshold detections to form consistent target tracks over space and time. Extensions to LRT using Doppler information will be developed. This technique has been used successfully in incoherent multistatic active sonar systems and in passive sonar.

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

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