Section 4: Pedestrian Tracking
|
Outdoor Pedestrian Tracking |
| • | Principle of operation: Foot-mounted IMU | |
 For outdoor use, the IMU is mounted in the heel of the user's boot. This protects the IMU and assures a firm fit of the IMU.
|
 CAL-FIRE Firefighters preparing for a 2-mile hike up the Stone Wall Peak trail near San Diego, CA. Using only the in-heel IMU and magnetometer, the PDR system tracked the hiking firefighters with average position errors of about 0.5% of distance traveled. |
|
|
•
• |
Features:
• Records and transmits the position of a walking person. • Does not require GPS. • Does not require beacons or any other external reference. • Eliminates effect of accelerometer drift with every step. • Does not require user-specific calibration*. • Records and (wirelessly) streams position data in real time.
Performance: • Click on "Video Clip" button above to see trajectory of a 4-mile/2-hour hike up and down Stone Wall Peak trail in California, using our PDR system's IMU and magnetometer only. • GPS was not used at all. • Average position error during the 2-mile ascent: ~0.5% of distance traveled. • Largest position error during the 2-mile ascent: < 40 meters.
Notes: *Requires 25 seconds of standing still and walking in a 360-degree circle prior to any mission.
|
|