The Department of Defense (DOD) is seeking proposals for the topic "DIRECT TO PHASE II: F7-Wideband Acoustic Receiver and Source (F7-WARS) Sonobuoy" under the SBIR program. The objective of this topic is to develop and demonstrate an updated air-deployable receiver with a compatible source that can characterize the acoustic ocean environment in the F7 Low Frequency range. The system will be deployed from Navy Maritime Patrol and Reconnaissance Aircraft and will have the capability to consistently attain key anti-submarine warfare (ASW) measurements. The technology should include enhanced signal processing techniques for both active and passive processing and should be capable of shallow and deep-water operations. The system should be low power and sized to fit within an A-size sonobuoy. The proposal should demonstrate prior successful development, testing, or deployment in a relevant domain and provide a forward plan that minimizes risk and incorporates existing ASW technologies. Feasibility documentation must be provided for Direct to Phase II participation. In Phase II, an over-the-side prototype unit(s) operating in the F7 Low Frequency range will be developed and demonstrated in both acoustic facilities and the ocean environment. The prototype should demonstrate successful completion of classified objectives and its adaptability and resilience in diverse acoustic settings. In Phase III, the prototype unit(s) will be transitioned into an air deployable sonobuoy system, meeting A-size packaging requirements. Testing and certification will be required for the sensor. This technology can benefit any entity that requires calibrated active target strength measurements within the underwater environment. The solicitation is open until June 12, 2024. For more information, visit the SBIR topic link or the solicitation agency website.