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Eladio Martin - Presentation at Emerging Communications Conference & Awards (eComm 2011)
1.
2.
eComm 2011, San
Francisco Alternatives to GPS for Localization Leveraging Smart Phones. June 29th 2011 Slide 2 of 16
3.
4.
A quarter of
all USA wireless phone users have utilized LBSSlide 3 of 16
5.
6.
France: Doris
7.
India: IRNSS (2014)
8.
Japan: QZSS (2013)Slide
4 of 16
9.
GPS Accuracy ~
6 meters GPS errors’ sources: Ionospheric effects (±5meters), Shifts in the satellite orbits (±2.5 meters), Satellite clock errors (±2 meters), Multipath effects (±1 meters), Tropospheric effects (±0.5 meters), Calculation and rounding errors (±1 meters) Slide 5 of 16
10.
11.
CoverageSlide 6 of
16
12.
13.
France: Doris
14.
India: IRNSS (2014)
15.
Japan: QZSS (2013)Slide
7 of 16
16.
17.
Inertial Navigation
Units (acc + gyro)
18.
Very expensive.
19.
Radio FingerprintingSlide
8 of 16
20.
WiFi Fingerprinting in
the iPhone Slide 9 of 40
21.
22.
Radio Fingerprinting Slide
11 of 40
23.
24.
Smart Phones:
25.
Granularity is poor
and Hardware dependent
26.
Slow refreshing rate
27.
Only RSSI information
from the same SIM card operator Slide 12 of 16
28.
29.
Accuracy of up
to 1.2 meters
30.
Dedicated Hardware
31.
Conventional Radio
32.
Dedicated Hardware
33.
Low accuracy (urban
suburb)
34.
Digital TV
35.
Dedicated Hardware
36.
Zigbee
37.
Dedicated HardwareSlide 13
of 16
38.
39.
Accuracy 2 –
3 meters
40.
Dedicated Hardware
41.
Ekahau
42.
Accuracy 1 –
3 meters
43.
Dedicated HardwareSlide 14
of 16
44.
45.
Avoid errors due
to differences in antenna characteristics and measurement schemes between different equipments
46.
e.g. 10 dB
between Dell Latitude laptop and Motorola Droid phone
47.
Leverage accelerometer
(gravity vector) and magnetometer (orientation)
48.
Orientation of phone
helps enhance the localization accuracySlide 15 of 16
49.
WiFi Fingerprinting with
Smart Phones Slide 16 of 40
50.
Stride Length Estimation
with Wavelet Slide 17 of 40
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