Test measurements of improved UWB localization technique for precision automobile parking

Abstract

Ultra-Wideband (UWB) communication system provides high accurate localization due to the high multipath resolution capacity. For Ultra-Wideband (UWB) Localization systems, time-based schemes namely Time of Arrival (TOA) and Time Difference of Arrival (TDOA) provide very good accuracy due to the high time resolution (large bandwidth) of UWB signals. Due to the inherent suitability aad accuracy of time-based approaches for UWB systems, particularly the TDOA technique, it is proposed as the appropriate UWB localization technique for the precision automobUe parking system. UWB pulse of 0.5 ns pulse width is simulated. Tests measurements are conducted using Impulse Radio UWB transceiver test setup. The TDOA values are measured for different positions of tag and reference nodes. Time-delay estimation is obtained by generalized cross correlation method and position esti....tion is obtained by direct method (DM) using hyperboHc navigation. The precision of the obtained position estimation is improved by an iterative Davidon-Fletcher-Powell (DFP) algorithm. The performance of the technique is analysed by determining the mean square error for various reference nodes densities. The proposed system is composed of UWB nodes, UWB tags and an UWB location server. With UWB tags, equipped only with transmitters, on targets and UWB nodes with both transmitters and receivers, installed on infrastructure, the system calculates the position of the tags precisely.

A Novel Experiment-Free Site-Specific TDoA Localization Performance-Evaluation Approach

“…Their performances were evaluated with experimental measurements in two scenarios where fixed and moving targets were located in the area respectively. In [19], an Ultra-Wide-Band (UWB) TDoA localization system utilized for an automobile parking system was exhibited. A mean square localization error was used as a metric to evaluate the localization system for a moving source.…”

“…A large number of contributions have been made on the performance evaluation of TDoA localization systems [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. They can be categorized into the simulation, the experiment and the combinations of these two.…”

“…Although these studies provide closed-form solutions to improve the algorithms, they typically assume a simple scenario where only Line-of-Sight (LoS) paths may exist. While, experimental measurements in a realistic area are commonly carried out to evaluate the performance of localization systems [17][18][19][20][21][22][23]. Despite the ability to consider real wave propagation and practical system errors, the experiments show an operation inconvenience as well as high cost, and the measurement results obtained in one area can not be applied to another.…”