Regardless of how Google has compiled its database, once we discovered how cell phones using Google Maps Mobile send their requests, we immediately thought of employing that functionality to build a specific remote localizer, which, unlike those that have been proposed so far, relies solely on GSM/GPRS for its radio connection, rather than use a…
The module used in our localizer is the Enabler IIIG GSM0308 by Enfora, one of the smallest yet best performing modules of this type currently available. The device, which utilizes a chipset made by Texas Instruments, is but 1.06 x 1.10 inches, is a quad-band that works both in Europe and the US, and has…
In order to be able to associate a GSM cell with its geographic coordinates, we utilize a Google Maps Mobile function, which is not documented, though. Before doing this, however, we need to know which cell the remote GSM device is connected to, that is, we need information regarding MCC, MNC, LAC, and CID. To…
The circuit our localizer is based on consists only of a quad-band GSM/GPRS module interfaced with a a microchip microcontroller which, after initializing the I/Os and UARTs it has at its disposal, puts the main program in a loop waiting for some event, which could be the arrival of an SMS or someone pressing the…
Our localizer is definitely simple, yet it must be built with care, as all of its components are SMD. Once the two-sided board is ready, be sure you have a very fine-pointed welder of up to 20 watts and a 0.02-inch-diametered (possibly, even smaller) welding thread. First of all, take care of the microcontroller; solder…
All configurations can be set remotely using any cell phone; what follows is a description of how settings and commands work. Let us start with the list of numbers that can be used to request location data: there can be up to eight numbers –the same numbers to which the localizer sends SMS messages containing…
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