Cell tracking, mobile GPS and cell phone track software applications are undoubtedly securing notice from potential buyers, mobile phone businesses and software developers. The most up-to-date mobiles contain GPS location capabilities to track telephone position.
GPS receivers, no matter whether inside a smartphone, or a specific Gps tracking device, compute location through process of precisely timing the signals sent by GPS satellites. This data contains the time the message was sent, precise orbital data (technically referenced as the ephemeris), and the overall system state and estimated orbits of all GPS satellites (technically called the almanac). GPS receivers often take a long time to become ready to use after it’s turned on because it must acquire some basic information in addition to finding GPS satellite signals. This slow start can be caused if the GPS cell phone has been turned off for days or weeks, or has been transported a far 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 acquire signals and calculate initial location more quickly.
GPS Hot Start is whenever the GPS enabled handset recalls its last calculated position, the satellites that had been in view before, as well as the almanac information in memory, and makes an attempt to connect to the same satellites and compute a fresh position based upon the previous information. This is almost always the quickest GPS lock but Hot Start only works if the phone is generally in the same location as when the GPS was last switched off. GPS Warm Start means when the GPS enabled cell phone keeps its last calculated position, and almanac used, but not which satellites were in view. It resets and tries to find satellite signals and computes a whole new location. The GPS receiver narrows the choice of which satellites toseek since it stored its last known location and the almanac data helps identify which satellites are visible in the sky. The Warm Start will need more time compared to Hot Start although not as long as a Cold Start. With GPS Cold Start, the device dumps all the previous data, and at
tempts to find satellites and obtain a GPS lock. This normally takes longer than other methods because there is no known reference data. The GPS enabled handset receiver has to try to lock onto a satellite signal from any accessible satellites.
In order to get improved GPS lock times mobile phone manufacturers and system providers developed Assisted GPS technology. This downloads the ephemeris and helps triangulate the device general location. GPS Receivers can get a quicker lock in return for a few kilobytes of data transmission. Assisted GPS, also referred to as A-GPS or AGPS, boosts the performance of normal GPS in smartphones connected to the cell network. In America Sprint, Nextel, Verizon Wireless, and Alltel all use A-GPS. Which is a means of using the cell network to speed up acquisition of GPS satellites.
A-GPS assists location tracking performance of mobile phones (along with other related devices) in two ways:
One method is by assisting to obtain a faster “time to first fix” (TTFF). AGPS receives and stores data in relation to satellite location using the cellular network and so the location data does not need to be downloaded via the satellite.
The other technique is by helping position devices when GPS signals are weak or blocked. Because GPS satellite signals may be interfered with by tall structures, and do not pass through building interiors well A-GPS makes use of distance to cellular towers to estimate position when GPS signals are not obtainable.
If satellite signals are not obtainable, or accuracy is less important than life of the battery, utilizing Cell-ID is a viable alternative to GPS mobile phone location. The position of the handset may be approximated by the cellular network cell id, that identifies the cell tower the cellphone is using. By knowing the location of this tower, then you can know roughly the spot where the mobile phone is. Still, a tower can cover a huge area, from a couple of hundred meters, in high populationdensity regions, to several kilometers in lower density zones. For this reason location CellID precision is less than than GPS accuracy. Nonetheless location using CellID still can provide a truly viable alternative.
Another way of determining device position is Triangulation or Mobile Location Services (MLS). Cell Tower Triangulation utilizes signal analysis data to calculate the time it takes signals traveling from the smartphone to no less than 3 cell towers to judge position.
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