Identification of the Absence of Direct Path in ToA-Based Indoor Localization Systems

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Executive Summary

Ultra-WideBand (UWB) indoor positioning systems based on Time of Arrival (ToA) techniques are considered to be the high precision alternatives to those employing Received Signal Strength (RSS) or Angle of Arrival (AoA) due to their superior time-domain resolution. However, the performance of such systems may easily be degraded by the blockage of the Direct Path (DP) and occurrence of Undetected Direct Path (UDP) condition. By erroneous detection of the other MultiPath Components (MPCs) as DP, which is the indicator of the true distance between the transmitter and the receiver, substantial localization errors will be introduced into the system.

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