It looks like you mistyped the URL in your address bar or have followed an old bookmark.
A few weeks ago I shared some research on absolute positioning without GPS. Since then I’ve continued digging into the subject, found a few more sources, and tried a few more things.
The new Qwiic Mini ToF Imager is here with a new Pixhawk flight controller and bladeRF 2.0 micro SDR FPGA boards!