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Location determinnation for mobile decives
- 1. Location Determination for Mobile Devices Wencong Yuan Apr 27 2012 [email protected]
- 2. Keynotes Cell tower ip GPS Wi-Fi RSS Three-axis gyroscope
- 3. Cell Tower Triangulation Neighborhood or city level accuracy Two-step , crowd- sourcing approach: Estimate cellular tower location using crowd-sourcing data At serving time , depends on the content in the query , compute device location using : a :nearest tower b : neighbor towers and c : fingerprint
- 4. IP Geolocation Citylevel accuracy For example ： http://ip.taobao.com
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- 6. GPS or Assisted-GPSLocation Best Available accuracy Power cost and unavailable indoors For example ： experiment in yanchang’s grass ground
- 7. Wi-Fi Location Similarto cellular ,however Wi-Fi radium is much much smaller 30m to 200m vs 500m to 2000m Most Wi-Fi AP are consumer grade , the RF is usually low quality and the radiation patterns among different vendors are usually poor
- 8. Wi-Fi Location BadMAC address assignment : Ad-hoc , tethering mode , duplicated addresses Mobile APs
- 9. Wi-Fi Location Accuracy case study San Francisco
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- 12. Wi-Fi Location Google StreetView Maxrad BMMG24005 SSID MAC
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- 15. Wi-Fi Location GoogleLocation Database Geolocation API For example : http://www.ip2location.com/html5geolocationapi.aspx
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- 18. RSS Radio SignalStrength
- 19. Three-axis gyroscope &MEMS Accelerometer
- 20. Q&A More information: http://www.ip2location.com/html5geolocationapi.aspx http://www.cnbeta.com/articles/110000.htm http://www.xieyidian.com/3240 http://ucdchina.com/snap/9797 http://en.wikipedia.org/wiki/W3C_Geolocation_API
- 21. Q&A http://static.googleusercontent.com/external_content/untrus ted_dlcp/www.google.com/zh-CN/us/intl/zh- CN/events/facultysummit/2010/files/mobile_location.pdf https://developers.google.com/maps/documentation/places/ http://www.zhihu.com/question/19809431 http://developer.android.com/guide/topics/location/obtainin g-user-location.html
- 22. Q&A http://www.microsoft.com/windowsphone/en- us/howto/wp7/web/location-and-my-privacy.aspx http://support.apple.com/kb/HT4995?viewlocale=en_US