Mini GSM localizer without GPS

  
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A localizer without GPS. We remake the old device with the cheaper SimCom module SIM900. In the previous post we present the GSM section and now we can present the complete localizator. This system allows for localization without directly using GPS technology; we are able to locate the desired object fairlyprecisely by using database availability together with the geographic position of the cells themselves.
Mini GSM localizer without GPS - schematic

In some country the cell coordinates are not publicly known (i. e. in Italy). If so, where do we find such data Through Google Maps Google has been able to store billions of data regarding the location of its clients` cell phones. But how does GSM localization work The radio mobile network is made up of a number of adjacent radio cells, each of which is characterized by an identifier consisting of four data: a progressive number ( Cell ID ), a code related to the area in which that given cell is ( LAC, or Local Area Code ), the code of national network to which the cell belongs (MCC, an acronym for Mobile Country Code ), and finally the company code (MNC, or Mobile Network Code ), which obviously identifies the phone company itself. For this reason, once a cell name and coordinates are known, and considering the maximum distance allowed between this cell and a phone before the phone connects to a new cell, it is possible to find out, approximately, the most distant position of the phone itself. For example, if the maximum distance has been determined to be one mile, the cell phone can be within a one-mile radius. It can be deduced that the more cells are found in a given area, the more precisely one can determine where the phone is located (up to 200-350 feet). The idea of employing only a GSM device to build a remote localization system occurred to us when we realized that Google Maps Mobile, which had been conceived to...



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