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: http://www.signalsystemscorp.com 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. Return