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LOCATION-BASED SERVICES

LOCATION-BASED SERVICES. Presented by Alan Reiter President, Wireless Internet & Mobile Computing reiter@wirelessinternet.com 301-715-3678. JAN. 4: LOCATION-BASED SERVICES. The multiple location technologies

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LOCATION-BASED SERVICES

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  1. LOCATION-BASED SERVICES Presented by Alan Reiter President, Wireless Internet & Mobile Computing reiter@wirelessinternet.com 301-715-3678

  2. JAN. 4: LOCATION-BASED SERVICES • The multiple location technologies • Technology offers a variety of ways to pinpoint locations of people and devices, from the common to state-of-the-art scary.  What are the pros and cons of different technologies:  RFID, cellular triangulation, WiFi, GPS?  And don't forget the new, more accurate tracking satellites as well as chips that already are implanted in humans.

  3. RFID • Several technologies • With or without a battery • 125KHz, 800 MHz, 900 MHz • Multiple uses • Payment cards, passports, toll roads • Tracking packages, animals, library books, casino chips, clothing, vehicles, luggage

  4. RFID • Significant privacy, security concerns • Illegally downloading data • Hacking/changing data • Implantable humans

  5. CELLULAR TRIANGULATION • Radio triangulation used for decades • Compute distance/lag time from cellular towers • Typically three towers, but one or two also used • Google Maps - one • Directional tower antennas can be more accurate • Accuracy varies greatly – 25 meters – 1,000 meters

  6. WIFI LOCATION • Skyhook Wireless for iPhone

  7. WIFI LOCATION • Skyhook now integrates WiFi hotspots and cellular towers, plus GPS

  8. SATELLITE LOCATION • U.S. Global Positioning System • Russian GLONASS • European Galileo • Chinese COMPASS

  9. U.S. GLOBAL POSITIONING SYSTEM • 30 satellites in medium Earth orbit • Two levels of accuracy: • Civilian – Standard Positioning Service • Worst-case accuracy: 300 feet • But often 20 feet to 100 feet • Military – Precise PositioningService • Encrypted, jam-resistant

  10. U.S. GLOBAL POSITIONING SYSTEM • Concerns over health of GPSnetwork dismissed by the Air Force • New generation of satellitesbeing launched • Accuracies of ten feet or less • Full complement around 2021

  11. RUSSIA GLONASS • GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (GLObal NAvigation Satellite System) • About 21 satellites, coveringRussia and most of the world • In December 2010, three satellites crashed during launch • Slightly less accurate than GPS • Possible 25% import duty on GPS-only devices

  12. CHINA COMPASS • COMPASS (Beidou-2) • 35 satellites • 27: medium Earth orbit • 5: geostationary • 3: highly-inclined geosynchronous

  13. CHINA COMPASS • Similar to GPS, GLONASS • Military and civilian use • Free service – accuracy to ten meters • Six or seven satellites launched • 2012: More than 10 satellites • Covering China and nearby countries • 2020: Completed with 35 satellites • Global coverage

  14. EUROPE GALILEO • Built by European Union and European Space Agency • Ostensibly under civilian control • Many budget problems • Reduced from 30 satellites to 18 • Conflicts between the U.S. and Europe over who would use Galileo

  15. EUROPE GALILEO • Accuracy was supposed to better than GPS and GLONASS • Accuracy of one meter • Two levels of accuracy • Free for most public uses • Paid and encrypted for businesses and military • Two to four satellites in 2012 • Completed in 2018?

  16. OTHER SYSTEMS • Japan launches first locationsatellite in September 2010: Michibiki • First of three satellites • To cover areas GPS misses • India plans location satellites • India Regional Navigation Satellite System (IRNSS) • First launch planned late 2011 • Seven satellites total

  17. THANK YOU! Alan Reiter reiter@wirelessinternet.com

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