Ultra-Wideband is starting to make its appearance in some customer-level products, such as airtags. I am not sure if interference would be an issue if tracking

Ultra-Wideband is starting to make its appearance in some customer-level products, such as airtags. I am not sure if interference would be an issue if tracking multiple object, but the technology seems like a good fit! From a simple search, this product might work: https://www.inpixon.com/technology/rtls/anchors/nanoanq-uwb https://www.inpixon.com/technology/rtls/anchors/nanoanq-uwb You could also go the custom hardware route and trilaterate signals from small embedded transmitters. That would require a lot of effort, but it should work using FPGAs and/or analog electronics. Another approach could be to use radar and/or RFID: http://rfidradar.com/howworks.html http://rfidradar.com/howworks.html