And the viewer lets you save the file as a tiff, after which in something like photoshop you can do anything with it you want. These are all copyright free, too, as they are basically historical in nature. Great for historians.
Wireless phones are just radios. The military has been able to use triangulation to locate the source of a signal for more than 50 years. If only one cell tower is picking you up, they only know your general area. If two or more can pick you up, it is not trick to plot the direction of the signal, draw lines and where they intersect... there you are. This would just be a fancier version of this simple "technology" which, thanks to computer data processing, could keep track thousands of radio-signal sources at the same time.
Slashdot Mirror
And the viewer lets you save the file as a tiff, after which in something like photoshop you can do anything with it you want. These are all copyright free, too, as they are basically historical in nature. Great for historians.
Wireless phones are just radios. The military has been able to use triangulation to locate the source of a signal for more than 50 years. If only one cell tower is picking you up, they only know your general area. If two or more can pick you up, it is not trick to plot the direction of the signal, draw lines and where they intersect ... there you are. This would just be a fancier version of this simple "technology" which, thanks to computer data processing, could keep track thousands of radio-signal sources at the same time.