group 9: chill geordi: rfid based location sensing brian loo (bloo) geeta shroff (gshroff) zane...
Post on 21-Dec-2015
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Group 9: ChillGeordi: RFID based location sen
sing
Brian Loo (bloo)
Geeta Shroff (gshroff)
Zane Starr (zcs)
Product Overview
• Indoor navigation system – When GPS not available
• Mapping application on desktop
• Map database loaded stored on device
• RFID tagged path read by device
• Communicated to user via text to speech software on device
Architecture• 1) Admin to create ma
p and layout tags• 2) Speech to text / tou
chpad• 3) RS322 / Wi-fi• 4) RFID GEN 2
State Diagram• Admin creates map• User inputs request
for a location• Device determines
location• Device fetches map
and plans path accordingly to tags being read.
• User follows instructions from device
State Diagram (PDA, Map GUI)
State Diagram (RFID)
Use cases
• Location assisted shopping
• Visually impaired location sensing
• Shortest path for couriers
• Directed tours
– One user per device
Use Error scenario• Low Battery• RFID tag not found in
database• Unable to read RFID
• Unable to understand user’s voice command
• Unable to connect with DB server
• Unable to plan path
• Device turns off• Ignore tag until next
tag is found• Move reader closer to
RFID• Inform user, revert to
using touch screen• Try 3 times, then
revert to using local version of DB
• Inform user, ask for another destination
Fundamental Risks
– SOFTWARE• Inaccurate route
planning– Unwanted
(impossible) paths in graph generation
• Device Driver handling capacity
– Multiple tags may collide
– HARDWARE• RFID sensor
– Identifying a sensor to integrate into project
• Maintenance & Infrastructure
– Price of RFID sensors & tags
– RFID's falling off walls
• Latency – Slow reading of RFID
tags
Ancillary Risks
– SOFTWARE• Software response time
– path planning, voice output/input
• Voice to text/ text to voice implementation
– Revert to touchscreen
– HARDWARE• RFID sensor
– Unable to get usable range
• Antennae – Size of usable
antennae
• Portability – Size of device
– Power of Sensors
Mitigations
• Inaccurate route planning
• Multiple tags colliding
• Software latency (path planning)
• Environmental( Signal attenuation)
• Price of RFID sensors & tags
• Portability (Power for sensors)
• Next hop path generation
• Not a problem for GEN 2 tags
• Astar algorithm (pruning)
• Insulated backing- aware of surrounding materials
• Passive tags are cheap
• Depends on sensor
END