This isn't true, cell phone towers do not "track to her residence".
Cell phone towers are omnidirectional. That means they transmit/receive in a 360 degree circle and do not determine direction. They can have an effective range of 3 to 45 miles depending on various electromagnetic variables including strength of the signal, other EM interference, topography, and man made structures to name a few.
Basic geometry says that a radius of 3 miles results in a 28.7 square mile circle. a range of 45 miles is 6361.73 square miles. Now in an urban center the square miles I assume would be toward the lower end. Now think of a Venn Diagram, when two circles overlap (as in the circle of a cell phone tower), then the probable area of overlap becomes a higher probability of general geographic area. However there is no cut and dried overlap between adjacent towers because of the variables already mentioned. In some cases the "overlap" can be large, in other cases the "overlap" could be small. The only way to know is use an EMF Strength Meter and systematically plot reception in a grid patter in the target area.
To establish through ELINT (Electromagnetic Intelligence) that the cell phone was located at her residence you would need:
- A directional antenna to provide a line of bearing (cell phone towers are omnidirectional, not directional), not omnidirectional antennas.
- A steady state signal
- At least two directional antenna's to provide multiple lines of bearing to establish general location, with 3 being preferred each on a different bearing.
So the cell phone tower data does not show residence, it shows an area of probability measured in square miles.
WW
Electronics Warfare Operator
ATC (AW/NAC)
USN, Ret.
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