Summary
International Symposium on Antennas and Propagation
2011
Session Number:ThG3
Session:
Number:ThG3-6
UWB Localization with 2-D Interpolation and K-Nearest Neighbor Based on Measurement Data
Rattiya Uppahad, Jirapat Sangthong, Sathaporn Promwong,
pp.-
Publication Date:2011/10/25
Online ISSN:2188-5079
Summary:
The indoor localization has several techniques that are used to estimate a location such as the received signal strength (RSS), the time of arrival (TOA), the time difference of arrival (TDOA) and the angle of arrival (AOA). Nevertheless, all above techniques are considered only signal from direct path. Therefore, they cause more error in dense multipath fading channels such as indoor environments. Now, UWB fingerprinting localization has been developed for this purpose. In this paper we evaluate the performance comparison of indoor localization based on UWB-fingerprinting using 2-D interpolation and K-Nearest Neighbor for building fingerprint patterns based on measurement data. Using vector network analyzer (VNA) to measure the channel frequency transfer functions S21 at frequencies ranging from 3 GHz to 11 GHz. Biconical antennas were used as both transmitter (Tx) and receiver (Rx) antennas with vertical polarization. The accuracy of estimated distances is studied and shown in the terms of cumulative distribution function (CDF). From the results, we found out that 2-D interpolation gets the best performance with high accuracy and precision, which the distance error is very low with the average value is 0.40 m, while the maximum of distance error is 2.00 m.