iPhone GPS Performance -


I am writing an iPhone app that depends on the location of the device. Management has entrusted me with the task of working how well GPS works within cities (higher buildings) and buildings.

Does any developers have the reliability of the GPS and the fall for the cell / wifi tower radius?

Management-friendly information will be the best, but the raw data I can translate will be fine too.

To determine the location of an object, from at least three satellites to the GPS system the radio signal

GPS accuracy, the status of the satellite, noise in the radio signal, the atmospheric conditions and natural barriers to the signal are affected by many factors. Noise can cause an error between 1 to 10 meters, and the result of static or interference of some from the receiver or some clouds and other atmospheric phenomena at the same frequency, and buildings such as between mountains or satellites and receivers. An error also occurs, sometimes up to 30 meters.

Multipath and masking effects of urban valleys, degrade the GPS accuracy and increase the geometric weakness of precision in receivers that work in dense urban areas. In the case of GPS applications designed for vehicles, the effectiveness of these events can be reduced on accuracy, thanks to the user's velocity which contributes to the average of multipath and thanks for the use of map matching. But pedestrians are not benefited from the same conditions, and for GPS pedestrians in dense urban areas, there is insufficient accuracy and integrity. In the downtown urban areas, tests conducted on large scale market terminals with integrated GPS receivers, 95 percent circular error potential (CEP) exposures appear between 50 and 100 meters.

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