Position acquisition (relative vs. absolute)

See also: SLAM hardware

Source:  Cometlabs

• relative (interoceptive sensors)
  • odometry
• absolute (exteroceptive sensors)
  • can be used alongside relative measurement sensors in order to correct odometry drift
  • beacons
    • direct measurement instead of integrating, therefore error in position does not grow unbounded
    • e.g. laser ranger finders, wifi (collect signal strength across field), GPS (bad for indoors)
      • Lidar, Ultra Wide Band (UWB), Wireless Fidelity, etc [ Wu ]
      • Compared to these, cameras are flexible and low-cost [ Wu ] (are also passive sensors) [ Cometlabs ]