How To Track Cell Phone GPS

How To Track Cell Phone GPS

Phone Tracker Basics

GPS Tecnological Topics

Different GPS start methods change how much time will be required to present location.

GPS Hot Start is the term for when the GPS enabled mobile phone recalls its last calculated location, the satellites which were in view at the time, as well as the almanac data in memory, and makes an attempt to lock onto the same satellites and calculate a brand new position based upon the previous data. This is generally 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 describes when the GPS enabled device remembers its last known position, and almanac used, but not which satellites were in view. It performs a reset and attempts to connect to satellite signals and computes a brand new position. The GPS receiver has a general idea of which satellites toseek since it stored its last known position and also the almanac data helps determine which satellites are visible in the sky. The Warm Start will need longer compared to Hot Start although not as much as a Cold Start.

With GPS Cold Start, the device dumps all the previous information, and tries to locate satellites and accomplish a GPS lock. This takes longer than other methods since there is no known reference data. The GPS enabled mobile phone receiver must attempt to lock onto a satellite signal from any accessible satellites.

So as to have better GPS lock times (the timeframe it takes to be able to lock onto the GPS Satellite signal) cellphone manufacturers and wireless providers introduced Assisted GPS technology. This downloads the ephemeris and helps triangulate the mobile phone general location. GPS Receivers can get a quicker lock in return for a few kilobytes of data transmission.

Assisted GPS, also called A-GPS or AGPS, helps the performance of normal GPS in handsets connected to the cell network. In the US Sprint, Nextel, Verizon Wireless, and Alltel all use AGPS. Which is a method of utilizing the cell network to speed up finding of GPS satellites. A-GPS assists location tracking performance of mobile phones (and other connected devices) in a couple of ways:

One way is by helping to acquire a faster “time to first fix” (TTFF). Assisted GPS receives and stores information concerning the location of satellites using the cell network so the location data does not need to be downloaded from the the satellite.

Another technique is by helping locate smartphones when GPS signals are weak or blocked. Due to the fact GPS satellite signals may be impeded by tall buildings, and do not pass through building interiors well A-GPS makes use of distance to cellular towers to calculate position when GPS signals are not obtainable.

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