LRSG Postitioning

1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Location Awareness for Low Rate Data
Devices Date Submitted 6 Nov, 2000 Source
Michael R Derby Company Time Domain Address
7057 Old Madison Pike, Huntsville, AL,
35806 Voice256 922 9229, FAX [phone],
E-Mailmike.derby_at_timedomain.com Re
LRSG Abstract Location Awareness for Low Rate
Data Devices This document describes possible
location awareness applications and briefly
describes TM-UWB mechanisms for determining
position of transceivers. Purpose Support of
LRSG PAR Notice This document has been prepared
to assist the IEEE P802.15. It is offered as a
basis for discussion and is not binding on the
contributing individual(s) or organization(s).
The material in this document is subject to
change in form and content after further study.
The contributor(s) reserve(s) the right to add,
amend or withdraw material contained
herein. Release The contributor acknowledges and
accepts that this contribution becomes the
property of IEEE and may be made publicly
available by P802.15.
2
LRSG - Location Awareness

• Provide location awareness and low rate
  communications.
• Tracking of assets, people, forklifts or anything
  that can move in various environments including
  industrial, retail, hospital, residential or
  office, while maintaining low rate data
  communications for equipment monitoring,
  messaging or controls.

3
Example

• Asset tracking
• Hospitals expensive equipment, Doctors.
• Home remote control, wallet, keys, phone,
  elderly and children.
• Office employees, computers.
• Industrial Forklifts, bales of cotton, products
• Airlines baggage

4
Example

• Shoppers in retail markets
• Push marketing and p-commerce.
• Influence of buying decisions at the point of
  sale.
• Targeted E-coupons.
• Optimization of store layout.

5
Example

• Firemen in burning building
• Where are they?
• What are their vital signs?
• How much Oxygen do they have remaining?
• Where am I?

6
Example

• Position Awareness
• Autonomous robotic controls.
• Amusement park guests.
• Mall shoppers.
• Corporate visitors.

7
How does it work?

• On the surface - similar to GPS but a technically
  a little different

8
3D Tracking

• 4 fixed plus 1 mobile transceiver
• Solve for XYZ of the mobile M unit using ranges
  to the 4 fixed units

F3
F2
M
NC
x
Here I am !
M mobile unit F fixed units NC network
controller
F4
Instrumented Range
Visualization
F1
9
Ranging Measurement

• Range determined from the time of flight of Time
  Modulated Ultra-wide Band pulses.
• Departing pulse time is known, arrival time is
  observed, time of flight is the difference
  between these.

10
Leading Edge Detection
Line of sight impulse response function
Baseband Amplitude
Leading edge Detected
Time (ns)
Zoom in
Baseband Amplitude
Time (ns)
11
Leading Edge Detection
Non Line of sight impulse response function
Baseband Amplitude
Leading edge Detected
Time (ns)
Zoom in
Baseband Amplitude
Time (ns)
12
State of the technology

• Current COMDEX Demo
• 2 Hz refresh rate
• Accuracy to 10cm
• Multilaterization using 4 fixed stations.
• Concurrent with Data Payload of 32Kbits
• Theoretical
• accuracy to lt1cm
• 1000 Hz refresh for a 1000s of tracked items.