RDF-J / ECM-J System: TDoA Signal Location Finding and Electronic Jamming with HackRF

Thank you to Janble for writing in and sharing with us their new software called "RDF-J / ECM-J SYSTEM". These are two distinct programs in a package.

The software is not open source, and it appears that Janble wishes to sell the software to interested parties. Currently, they do not have a website, and they wish to refer interested parties to their X post for more information on pricing and how to obtain the software. As with any closed-source software, we can only recommend that interested parties do their own due diligence on the safety of the software.

RDF-J is a Time Difference of Arrival (TDoA) and signal strength-based radio direction finding program, which utilizes multiple HackRF software-defined radios spread out over an area. Janble writes that the radio direction finding system can operate using either TDoA and signal strength methods independently or together, with a minimum of three nodes being required, and ideally five.

We clarified with Janble that the TDoA system uses a GPS synchronization approach to achieve the required timing accuracy.

The second program, part of the same package, is ECM-J, which is an electronic countermeasure system. It appears to use a HackRF to transmit a jamming signal. Obviously, jamming is illegal in most countries, so this is to be used at your own risk.

Janble has sent us a PDF showing the software in more detail, and they have uploaded a YouTube video, shown below.