Cell Phone GPS Tracking Guide

Systems for Cellular Telephone Tracking – GPS Tecnological DetailsDiverse GPS start options change how much time is usually necessary to produce location. GPS Hot Start refers to whenever the GPS enabled mobile phone recalls its last known location, the satellites that were in range at the time, and also the almanac information in memory, and tries to lock onto the same satellites and calculate a fresh position based upon the previous information. This is generally the quickest GPS 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 describes when the GPS enabled handset remembers its last calculated position, and almanac used, but not which satellites were in view. It performs a reset and makes an attempt to lock onto satellite signals and calculates a fresh location. The GPS receiver narrows the choice of which satellites tolook for since it stored its last known position and also the almanac data helps determine which satellites are in range. The Warm Start will need more time than the Hot Start but not as much as a Cold Start. With GPS Cold Start, the device deletes all the previous data, and tries to locate satellites and accomplish a GPS lock. This will take the longest since there is no known reference data. The GPS enabled handset receiver must try to lock onto a satellite transmission from any available satellites. As a way to get improved GPS lock times (the time it requires to be able to lock onto the GPS Satellite signal) cellular phone manufacturers and network providers developed Assisted GPS technology. It downloads the ephemeris helping triangulate the smartphone basic position. GPS Receivers can get a faster lock in exchange for a few kilobytes of data transmission. Assisted GPS, generally known as A-GPS or AGPS, enhances the performance of normal GPS in mobile phones connected to the cellular network. In the US Sprint, Nextel, Verizon Wireless, and Alltel all use AGPS. Which is a means of utilizing the cellular network to accelerate acquisition of GPS satellites. A-GPS improves location tracking performance of smartphones (as well as other related devices) in a couple of ways: The first way is by assisting to acquire a faster “time to first fix” (TTFF). AGPS receives and stores data concerning the location of satellites using the cellular network and so the location information does not require to be downloaded from the the satellite. The second method is by helping position mobile phones when GPS signals are weak or blocked. Due to the fact GPS satellite signals may be impeded by tall buildings, and do not penetrate building interiors well AGPS uses distance to cellular towers to compute position when GPS signals are not readily available. GPS Isn’t The Only Way To Pinpoint A Cell Phone In the event that satellite signals are not accessible, or accuracy and precision is less important than life of the battery, making use of Cell-ID is a useful substitute to GPS smartphone location. The location of the cell phone may be calculated by the cell network cell id, which recognizes the cell tower the cell phone is using. By understanding the location of this tower, you’ll be able to know roughly the spot where the mobile phone might be. However, a tower can cover a large area, from a few hundred meters, in high populationdensity zones, to several miles in lower density zones. This is the reason location CellID precision is lower than GPS accuracy. Nevertheless location via CellID still offers quite a viable alternative. Another way of determining device location is Triangulation or Mobile Location Services (MLS). Cell Tower Triangulation uses signal analysis data to compute the time it takes signals traveling from the mobile phone to no less than 3 cell towers to calculate position. In general it comes down to what location tracking system is available, and also the requirements for accuracy. Hybrid methods are emerging that use various techniques in tandem to provide best available location given available resources. It might be critical to consider how GPS location software applications handle the data and controls handset settings including options of getting realtime tracking on demand, or preferring to reduce battery use and data transmission. Generally the software decides the location with a GPS receiver and sends the tracking information to a server through a cellular packet data connection. The data connection to the server is usually made over the internet. How often GPS samples are taken and how frequently and by precisely what technique the data is sent to the server impact effectiveness and likely costs.

Cell Phone GPS Tracking Guide