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To help adhere to Federal Communications Commission guidelines, cell phone companies have to be in a position to furnish authorities with cell phone latitude and longitude to an accuracy of 50 to 300 meters. Cell Tower Triangulation isn't going to always satisfy this condition. For evaluation, commercially accessible GPS systems can certainly realize accuracy right down to less than 10 meters. This depends upon many factors, as GPS signals are often particularly weak and they are disturbed by numerous factors. With Mobile Location Services (MLS), the GSM cellular [url=http://www.mquin.com/saclancel.php]lancel pas cher[/url] network provider uses triangulation algorithms to estimate the position of the mobile phone, its accuracy is proven to be much worse than that of GPS. MLS is further impacted by factors similar to GPS in the sense of the interference impeding signal quality and the density of GSM towers to help in the triangulation calculation. [url=http://www.mquin.com/gzparis.php]giuseppe zanotti sneakers[/url] In rural areas location accuracy may be off as much as a mile.

GPS receivers, regardless of whether inside of a smart phone, or a specific Portable gps tracking device, compute specific location by accurately timing the signals transferred by GPS satellites. This information provides the time the message was transmitted, exact orbital data (formally referred to as the ephemeris), along with the basic system health and projected orbits of all GPS satellites (formally referred to as the almanac). GPS receivers sometimes take a long time to become ready to [url=http://www.mnfruit.com/louboutinpascher.php]louboutin pas cher[/url] navigate after being turned on because it must acquire some basic information in addition to capturing GPS satellite signals. This slow start can be caused if the GPS mobile phone has been unused for days or weeks, or has [url=http://www.mquin.com/gzparis.php]giuseppe zanotti pas cher[/url] been transported a significant distance while turned off for. The GPS must update its almanac and ephemeris data and store it in memory. The GPS almanac is a set of data that every GPS satellite transmits. When a GPS receiver has current almanac data in memory, it can capture satellite signals and calculate initial position more quickly.

GPS Hot Start refers to when the GPS enabled handset keeps its last known location, the satellites which were in range before, together with the almanac data in memory, and tries to lock onto the same satellites [url=http://www.mquin.com/saclancel.php]lancel[/url] and determine a brand new location based upon the previous data. This is usually the quickest GPS [url=http://cgi.ebay.co.uk/170693034119]louboutin pas cher Are the In[/url] lock but Hot Start only works if the phone is in the same general area as when the GPS was last turned off.

GPS Warm Start is whenever the GPS enabled handset remembers its last calculated position, and almanac used, but not which satellites were in [url=http://www.thehygienerevolution.com/barbourparis.php]barbour paris[/url] view. It performs a reset and tries to find satellite signals and calculates a brand new location. The GPS receiver narrows the choice of which satellites toseek because it saved its last known position and also [url=http://www.mnfruit.com/airjordan.php]jordan pas cher[/url] the almanac data helps determine which satellites are within view. The Warm Start will need longer compared to Hot Start but not as much as a Cold Start.

With GPS Cold Start, the device dumps all the previous information, and tries [url=http://www.thehygienerevolution.com/barbourparis.php]barbour[/url] to locate satellites and achieve a GPS lock. This normally takes the longest since there is no known reference data. The GPS enabled smartphone receiver has to attempt to lock onto a satellite transmission from any available satellites.


Assisted GPS, also known as A-GPS or AGPS, helps the performance of normal GPS in cell phones connected to the cell network. In the United States Sprint, Nextel, Verizon Wireless, and Alltel all use A-GPS. Which is a means [url=http://cgi.ebay.co.uk/170693034119]giuseppe zanotti Movado Desig[/url] of using the cell network to speed up finding of GPS satellites. A-GPS improves location tracking functions of smartphones (and also other connected devices) in two ways:

The first way will be helping to secure a more rapid "time to first fix" (TTFF). Assisted GPS gets and archives information about satellite position using the cellular network and so the coordinates information does not require to be downloaded from the the satellite.

The other way is by helping locate devices when GPS signals are weak or not available. Due to the fact GPS satellite signals may be interfered with by tall buildings, and do not go through building interiors well Assisted GPS employs distance to cellular towers to approximate position when GPS signals are not accessible.

In the event that satellite signals are not available, or accuracy and [url=http://www.vill.tabayama.yamanashi.jp/cgi-def/admin/C-002/bb1209/visit/main.pl]air jordan pas cher How to Gr[/url] precision is less important than battery life, employing Cell-ID is a good alternative to [url=http://www.jordanpascherofficiele.com]air jordan pas cher[/url] GPS mobile phone tracking. The location of the cell phone can [url=http://www.gotprintsigns.com/abercrombiepascher/‎]abercrombie soldes[/url] be approximated by the cell network cell id, that determines the cell tower the cellphone is using. By knowing the location of the [url=http://www.mxitcms.com/tiffany/]tiffany outlet[/url] tower, you'll be able to know approximately the spot where the cell phone will be. Still, a tower can cover an enormous area, from a couple of hundred meters, in higher populationdensity areas, to a few kilometers in lower [url=http://www.ilyav.com/uggsoldes.php]ugg pas cher[/url] density zones. This is why location CellID precision is less than than GPS accuracy. Having said that location via CellID still offers quite a helpful alternative.

Another method of formulating mobile phone location is Triangulation or Mobile Location Services (MLS). Cell Tower Triangulation utilizes signal analysis data to calculate the time it takes signals traveling from the cell phone to a minimum of 3 cell towers to determine location.