Paul Steffes is neglecting to tell you that you get the 9 mile hit from just one of the local towers, there are others within or near the cell area that also have signal and can be tracked. You get (have) record of three of them and you’ve got better than his 9 miles. Cell phones have to have next strongest backups because the potential exists you might transit into one and need your home coverage there. A very misleading article if you ask me.
Paul Steffes is neglecting to tell you that you get the 9 mile hit from just one of the local towers, there are others within or near the cell area that also have signal and can be tracked. You get (have) record of three of them and you’ve got better than his 9 miles. Cell phones have to have next strongest backups because the potential exists you might transit into one and need your home coverage there. A very misleading article if you ask me.
In the Navy, I did that and it was called HFDF (High Frequency Direction Finding), and it was always done with a 3 site axis. You recorded the direction each site received the signal, and then crossed them. That “X” of where the (at least) three lines crossed is the transmitting location.
If it’s 1 site, it’s a bearing. If it’s two, you get a general location. Three or more, you triangulate even further down.