Cell tracking, cell phone GPS and cell phone tracking software applications are undoubtedly gaining particular attention from potential buyers, phone companies and software makers. The most current cell phones provide GPS position attributes to track cellphone position.
To help adhere to Federal Communications Commission guidelines, cell phone companies must be able to provide authorities with smartphone latitude and longitude to an precision of 50 to 300 meters. Cell Tower Triangulation does not always satisfy this condition. For comparison, commercially accessible GPS systems will be able to obtain precision right down to less than 10 meters. This is dependent on a lot of factors, as GPS signals tend to be rather weak and they are disturbed by numerous variables. With Mobile Location Services (MLS), the GSM cellular network provider uses triangulation techniques to compute the location of the handset, its accuracy is proven to be much worse than that of GPS. MLS is also affected by factors similar to GPS in the sense of the barriers impeding signal quality and the density of GSM towers to help in the triangulation effort. In remote areas location accuracy may be off as much as a mile.
GPS Hot Start refers to whenever the GPS enabled device keeps its last calculated location, the satellites that had been in view at the time, together with the almanac data in memory, and attempts to obtain the same satellites and determine a fresh position based upon the previous information. This is usually the quickest GPS lock but Hot Start only works if the phone is generally in the same location as when the GPS was last turned off. GPS Warm Start refers to whenever the GPS enabled handset recalls its last calculated position, and almanac used, but not which satellites were in range. It resets and tries to lock onto satellite signals and calculates a whole new location. The GPS receiver has a general idea of which satellites tolook for since it saved its last known location and also the almanac data helps identify which satellites are within view. The Warm Start is going to take longer than the Hot Start although not as long as a Cold Start. With GPS Cold Start, the device dumps all the previous information, and attempts to locate satellites and achieve a GPS lock. This normally takes the longest because there is no known reference data. The GPS enabled handset receiver must attempt to lock onto a satellite transmission from any available satellites.
In order to get better GPS lock times cellphone manufacturers and system providers introduced Assisted GPS technology. This downloads the ephemeris helping triangulate the device basic 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, improves the performance of standard GPS in cell phones connected to the cellular network. In America Sprint, Nextel, Verizon Wireless, and Alltel all use A-GPS. This is a method of utilizing the cell network to speed up finding of GPS satellites.
A-GPS improves location tracking performance of mobile phones (as well as other related devices) in two ways:
One method will be assisting to acquire a faster “time to first fix” (TTFF). A-GPS gets and archives information about the location of satellites via the cellular network so the position data does not require to be downloaded via the satellite.
The next way is by helping position handsets when GPS signals are weak or not available. Since GPS satellite signals may be impeded by tall structures, and do not pass through building interiors well Assisted GPS uses proximity to cellular towers to compute position when GPS signals are not readily available.
When satellite signals are not obtainable, or precision is less important than battery life, applying Cell-ID is a good alternative to GPS mobile phone location. The position of the handset might be calculated by the cell network cell id, which identifies the cell tower the phone is connected to. By knowing the location of this tower, you may know approximately where the mobile phone might be. However, a tower can cover a huge area, from a couple of hundred meters, in higher populationdensity locations, to several kilometers in lower density regions. For this reason location CellID precision is less than than GPS accuracy. Nonetheless location via CellID still provides a truly good substitute.
Another way of determining smartphone position is Triangulation or Mobile Location Services (MLS). Cell Tower Triangulation makes use of signal analysis data to calculate the time it takes signals to travel from the telephone to no less than three cell towers to judge position.
Phone Tracking Fundamentals
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