By Johan Hjelm
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Additional resources for Creating Location Services for the Wireless Web
Several such systems were in fact commercialized, for instance, for use in airports (where an error of 50 meters in approaching the runway would be disastrous, to say the least). Differential GPS is also used for geodetics; for example, in determining reference point locations on a map. Different sources have been used for the reference signal, such as radio broadcast towers (broadcast over the FM band) and mobile networks as well. The reference signal needs to contain a time reference of the same format as the GPS signal, however, and that means that mobile systems in themselves are unsuitable as reference signal providers (because there is no synchronization of the time signals in most mobile networks).
Not all network operators have implemented it, however. Because all handsets have to be in a cell to work and must know the cell information, all mobile handsets work with this positioning method. 5 km radius), the cell information is not particularly helpful for the user, even if you know the position of the cell. To know that you are almost 10 kilometers from something is not much help, whether you are looking for a restaurant in downtown Bangkok or an eagle nesting in a tree in the middle of a Swedish forest.
If it picks satellites that are widely separated, the circles intersect at almost right angles and that minimizes the error region. Good receivers determine which satellites will give the lowest GDOP and use them (it can calculate the satellite angles because it has the almanac data). Because the receiver does not know where it is when it starts measuring, it has to do a search for the satellite signals. If the receiver has an almanac, it can minimize the search pattern and do a warm start (searching in the orbits where it is more likely the satellites are).