In the world of indoor GPS, Nokia already has a Wifi-based High Accuracy Indoor Positioning System. But Windows is determined to best that.
Soon the world of GPS will be headed out of the parks and into shopping malls and buildings all over the country. Microsoft has released a study exploring technology they are currently researching to bring GPS indoors without the use of Wifi. According to the study, the solution to the indoor GPS problem is by attaching a steerable, high-gain, directional antenna to the front of the GPS receiver which helps attain location fixes using signal processing from the cloud with acquisition results from different directions over time.
The research team tested their theory with a 10×10 inch board with 16 antennas arranged in a ray in 31 random indoor single-story locations such as warehouses and shopping centers. They were able to obtain location fixes in 20 of them with a median error of less than 10 meters. According to Jie Liu, a principle researcher at Microsoft, this is a test that all conventional GPS receivers fail. With more research, Liu said he expected the technology to shrink to a more viable size. read more
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