in several of the forums I've read posts about pingers and hydrophones that might be used for a variety of reasons, navigation, eaves dropping on whale karaoke, sonars, control, modems, etc.
I’m currently in the concept design phase for a simple wide band hydrophone, that will be light weight, low profile, and can be outboard of the ROV housing and independent of ROV power, electronics and/or the ROV communications.
As I progress through the gap analysis of this design, I'd love to read about the needs of OpenROV users (and others) as to how and/or why a pinger, hydrophone, or a fully integrated sonar will be helpful for fun & science.
Please reply with your story. What do you hope to achieve with a hydrophone or sonar on your openROV? Perhaps you have a need for a hydrophone by itself, to hear songs of marine mammals, or perhaps as an array as part of USBL or LBL network or as a DVL integrated with an IMU. For whale song observation, will it be helpful to integrate with a cell phone to record sound?
I've 12 years of sonar design experience for a major sonar manufacturer. We had fun designing, building, testing, integrating, supporting and sometimes
flooding retiring tens of thousands of sonar systems. Many hundreds of these sonars were unique variations of Doppler Velocity Logs (DVL), Acoustic Doppler Current Profilers (ADCP), Acoustic Doppler Flow meters (ADFM) and Hydrographic multi-fan-beams integrated with a variety of other sensors. All of these systems cost tens of thousands of dollars. Perhaps they could cost far less.
Please, I welcome reading about what you'd like to do with your sonar or hydrophone! Perhaps we can design a simple, inexpensive open system that will meet your needs.