You're in a shrinking minority of the American inhabitants in case you don’t personal at the least one digital communications system. There are more than 119 million cell-phone customers in the United States as of July 2001. Each day, hundreds extra join. Millions more have two-means pagers. The radio alerts emitted from these units can reveal our location at anytime. This skill to locate cell-cellphone customers will grow to be a vital element of future visitors-administration techniques. On a short stretch of freeway in Calgary, Alberta, iTagPro Cell-Loc is testing out its new cell-cellphone monitoring know-how. In July 2001, itagpro the corporate despatched a recognized automobile down a 1.25-mile (2-km) part of a significant highway, via the heart of the city, to check the accuracy of its system. The truck carried a GPS receiver onboard to check the system’s accuracy. "We collected data from both the GPS receiver within the car, and from our system that was monitoring the cellphone remotely, and we compared the 2 and found them to be, not an identical, but shut sufficient for our functions we’re talking about," Andrew Hillson, iTagPro Cell-Loc’s director of service expertise, stated.

Listening posts are positioned all through a metropolis, either next to a cell-cellphone base station or in independent areas. Listening posts are comparable to half a base station: They will detect but not transmit radio indicators. Three listening posts are needed to get a two-dimensional place of a cell-telephone consumer. Listening posts detect cell-phone transmission, iTagPro Smart Tracker decode it and then time-stamp the arrival of a wavefront from the transmission. Once three towers have time-stamped a transmission, the knowledge is shortly despatched to a central pc that uses hyperbolic multilateration to find out the cell phone’s position on a highway. "Hyperbolic multilateration" is only a fancy manner of saying triangulation, Hillson mentioned. A position is set by locating the intersection of the hyperbolas from the radio waves detected by the listening posts. By analyzing how lengthy it takes the radio wave to reach the listening publish from the mobile phone, a pc can calculate almost precisely the place somebody is located on the freeway. If the person’s location on the map is proven as off the highway, the pc corrects for this and snaps the location to the road. The complete strategy of detecting a person’s position occurs in seconds. Hillson mentioned that Cellocate meets the FCC’s mandate and iTagPro is correct within 330 feet (one hundred m) 67 p.c of the time. Within 990 toes (300 m), the system is correct 95 percent of the time. It helps AMPS(Advanced Cell phone System) and CDMA (Code Division Multiple Access) air interfaces. Cell-Loc is pursuing partnerships with cell-telephone service suppliers. The service, iTagPro Device which would allow cell-phone customers to obtain instantaneous, personalised visitors warnings, will probably be accessible in a year or two and value about $4 or $5 per thirty days.

"Drive and save" programs are nothing new. Progressive introduced their Snapshot program in 1998. Since then State Farm, Allstate, Liberty Mutual, and Nationwide among others have rolled out related applications to track driving habits and reward drivers with secure driving reductions.

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Pub: 09 Dec 2025 15:06 UTC

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