Physics-Based Improvements for Continuous Active Sonar (CAS)
Navy SBIR FY2018.1

Sol No.: Navy SBIR FY2018.1
Topic No.: N181-057
Topic Title: Physics-Based Improvements for Continuous Active Sonar (CAS)
Proposal No.: N181-057-0680
Firm: Signal Systems Corporation
1127-B Benfield Blvd
Millersville, Maryland 21108
Contact: John Murray
Phone: (410) 987-1552
Web Site:
Abstract: SSC proposes to develop a novel motion-adaptive matched filter, tuning standard replicas to account for time-varying delays observed in received echoes. The method uses segments of the transmitted waveform to create a bank of time-dilated (Dopplerized) replicas to measure the time-varying delay of strong returns, accounting for unknown or unmeasured motions of the surface ship hull sonar, towed array, and target and thereby reducing signal mismatch. A physics model then dilates the original waveform accordingly, ultimately sharpening and increasing the SNR of target echoes.
Benefits: The proposed research will reduce signal mismatch, range uncertainty, reduce false alarms and improve tracking using Continuous Active Sonar without requiring any hardware changes or changes to the transmitted waveform.