Nokia高精度室内定位HAIP

High Accuracy Indoor Positioning Based on BLE Kimmo Kalliola

Research Leader

April 27, 2011

Motivation for Indoor Positioning •Location based services are growing

enabled by mobile devices with GPS

•People spend most of the time indoors

•No wide-spread indoor positioning

systems and services are available yet

•GPS operation is very limited indoors •Personal communication devices can

enable indoor positioning through local wireless networks

•Big market opportunity in indoor location based services, such as targeted advertising

People spend 80-90% of their

time indoors

70% of cellular calls and 80% of

data connections originate

from indoors.

(Source Strategy Analytics) Time spent …

Indoor Navigation needs

Who’s around?

Where to

find milk?

How to get there? What can I

find here?

Where did I

leave my car?

Where is the closest restaurant?

WiFi Positioning

•Based on measuring the relative received signal strength (RSS) from WiFi access points at the mobile

•Available today in many smartphones but with limited accuracy

•Location accuracy typically 30 – 50 meters

•Adequate for local search but not for indoor navigation

•Limited coverage and accuracy inside large indoor spaces due to automatic data collection

•Floor information not available

•Used for asset tracking in specific environments, such as hospitals

•Provides room level accuracy with good probability

•Requires manual calibration

•Challenges:

•Achieving high accuracy in large open indoor spaces – such as malls, supermarkets, or airports– is

challenging due to radio signals propagating easily large distances

•Accuracy is deteriorated by directional handset antennas, which affect the relative AP signal strengths •Practical maximum reachable accuracy is 3-10 meters depending on environment

HAIP – High Accuracy Indoor Positioning

HAIP – Location Enhanced Bluetooth Technology •Built on top of Bluetooth Low Energy (BLE) technology by adding direction finding capability

•Provides up to 0.3 m position accuracy

•Based on directional positioning beacons installed in covered areas •Beacon density similar to WiFi access point density

•Typically 1 beacon / 100 - 2500 m2 depending on installation height •No calibration required

•One way communication is sufficient between the mobile and the positioning beacon, i.e. time synchronization is not needed

•Mobile locates itself by measuring DoD (Direction of Departure) of a signal broadcasted by the positioning beacon

•No networking connection needed

•No latency

•No privacy concerns