Creating Location Services for the Wireless Web by Johan Hjelm

By Johan Hjelm

Every little thing is ok with its content material. I simply don't love its variety. RFCs are extra relaxing to learn than this e-book. the author says that this bankruptcy provide you with whatever yet you want to locate it, no bullets, no balds, no italics, only a undeniable textual content. To sum up, i do not locate it readable. back i do not say whatever approximately its content material. This e-book provides notion (nothing extra) approximately position prone for instant internet, yet you need to be able to learn four hundred web page simple textual content. a few may perhaps like this sort of books. with a purpose to get pleasure from whereas analyzing please think carefully ahead of deciding to buy.

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That way the roving receiver can interpolate its position between updates. The communication is done through some other radio network than the GPS network; for instance, the FM network or the mobile phone network (see the section on Assisted GPS). The second receiver can then correct its calculations for better accuracy, because the distance between the receivers can usually be discounted. In the early days of GPS, reference stations were often established by private companies that had big projects demanding high accuracy or as a service by companies such as radio broadcasters.

3 How cell ID sector with timing advance works. 32 CHAPTER 2 Cells are not perfect circles, however, because the different antennas can send out lobes of radio waves that are of different length (different effect gives different distance, and objects in the terrain make the lobes reach different distances at the same effect). In other words, the ideal case of determining a sector of the cell hardly ever works, and in cases where the cell size is smaller than 1 km, it does not give any advantage to use timing advance (because the resolution of the cell will be smaller than the resolution of the timing advance).

Cell ID-Based Positioning In all of the mobile systems in operation today, when the user presses the “on” button or enters a cell, the mobile phone connects to the network through the base station and there is a signal to a central database stating that a mobile telephone (a mobile station is the correct terminology) has entered a cell. This central database is connected to a telephone system (or a packet network, in the case of UMTS, GPRS (the packet version of GSM), and CDPD (the packet version of TDMA)).

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