Effects of Antenna Orientation in Ultra Wideband Indoor Positioning System

Chansamood, Panthip; Wisadsud, Sodsai; Maneerat, Kriangkrai; Sanpechuda, Taweesak; Chinda, Krisada; Kaemarungsi, Kamol

doi:10.1109/ecti-con47248.2019.8955437

Cited by 4 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because

varies according to the distance

, a normalized bias error

is used in the calibration. The calibration should be performed at multiple calibration points, as shown in Figure 3 , to reflect the error characteristics of the UWB transceiver, which vary according to the direction of the signal [ 34 ].

is computed as the average of the normalized biases measured at the calibration points as follows:

where

represent the true and estimated position of the i th calibration point,

denotes the distance between the robot and

, and

is the number of calibration points.…”

Section: Methodsmentioning

confidence: 99%

Component-Wise Error Correction Method for UWB-Based Localization in Target-Following Mobile Robot

Bae

Son

Song

et al. 2022

Sensors

View full text Add to dashboard Cite

Target-following mobile robots have gained attention in various industrial applications. This study proposes an ultra-wideband-based target localization method that provides highly accurate and robust target tracking performance for a following robot. Based on the least square approximation framework, the proposed method improves localization accuracy by compensating localization bias and high-frequency deviations component by component. Initial calibration method is proposed to measure the device-dependent localization bias, which enables a compensation of the bias error not only at the calibration points, but also at the any other points. An iterative complementary filter, which recursively produces optimal estimation for each timeframe as a weighted sum of previous and current estimation depending on the reliability of each estimation, is proposed to reduce the deviation of the localization error. The performance of the proposed method is validated using simulations and experiments. Both the magnitude and deviation of the localization error were significantly improved by up to 77 and 51%, respectively, compared with the previous method.

show abstract

“…Because

varies according to the distance

, a normalized bias error

is computed as the average of the normalized biases measured at the calibration points as follows:

where

represent the true and estimated position of the i th calibration point,

denotes the distance between the robot and

, and

is the number of calibration points.…”

Section: Methodsmentioning

confidence: 99%

Component-Wise Error Correction Method for UWB-Based Localization in Target-Following Mobile Robot

Bae

Son

Song

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…Each node has four anchors at a fixed distance, and a tag is placed between them. In UWB-based devices, the antenna orientation affects the positioning performance, and researchers have found that a vertical orientation yields better results than a horizontal orientation [42]. Therefore, we placed the antennas of the four anchors in a vertical orientation, with the antennas of anchors 3 and 4 rotated by 90 degrees.…”

Section: Uwb-based Relative Positionmentioning

confidence: 99%

Relative-Position Estimation Based on Loosely Coupled UWB–IMU Fusion for Wearable IoT Devices

Sagar¹,

Kim²,

Park³

et al. 2023

Computers, Materials &Amp; Continua

View full text Add to dashboard Cite

Relative positioning is one of the important techniques in collaborative robotics, autonomous vehicles, and virtual/augmented reality (VR/AR) applications. Recently, ultra-wideband (UWB) has been utilized to calculate relative position as it does not require a line of sight compared to a camera to calculate the range between two objects with centimeter-level accuracy. However, the single UWB range measurement cannot provide the relative position and attitude of any device in three dimensions (3D) because of lacking bearing information. In this paper, we have proposed a UWB-IMU fusion-based relative position system to provide accurate relative position and attitude between wearable Internet of Things (IoT) devices in 3D. We introduce a distributed Euler angle antenna orientation which can be equipped with the mobile structure to enable relative positioning. Moving average and min-max removing preprocessing filters are introduced to reduce the standard deviation. The standard multilateration method is modified to calculate the relative position between mobile structures. We combine UWB and IMU measurements in a probabilistic framework that enables users to calculate the relative position between two nodes with less error. We have carried out different experiments to illustrate the advantages of fusing IMU and UWB ranges for relative positioning systems. We have achieved a mean accuracy of 0.31 m for 3D relative positioning in indoor line of sight conditions.

show abstract

“…During the distance ranging from 20 m, the MAPE in distance reached 3 m. There were no distance measurements when the tag was placed horizontally. Chansamood et al [27] investigated the impact of antenna orientation between the initiator and responder. The authors claimed that the highest range could be achieved when the initiator and receiver were placed vertically.…”

Section: Ranging Experiments In Dual Communication Modementioning

confidence: 99%

Ultra-Wideband-Based Time Occupancy Analysis for Safety Studies

Fakhoury,

Ismail

2023

Sensors

View full text Add to dashboard Cite

This study investigates the use of ultra-wideband (UWB) tags in traffic conflict techniques (TCT) for the estimation of time occupancy in a real-world setting. This study describes UWB technology and its application in the TCT framework. Many experiments were conducted to evaluate the accuracy of the occupancy time measurement using a UWB-based tag. The UWB performance was measured using data from UWB tags as well as a video camera system by subtracting the time occupancy within a conflict zone. The results show that the UWB-based system can be utilized to estimate occupancy time with a mean absolute error difference from ground truth measurements of 0.43 s in the case of using two tags and 0.06 s in the case of using one tag in an 8 m × 8 m study area with double-sided two-way communication. This study also highlights the advantages and limitations of using UWB technology in TCT and discusses potential applications and future research directions. The findings of this study suggest that the UWB-based localization of multiple tags needs further improvements to enable consistent multi-tag tracking. In future work, this technology could be utilized to estimate post-encroachment time (PET) in various traffic scenarios, which could improve road safety and reduce the risk of collisions.

show abstract

Effects of Antenna Orientation in Ultra Wideband Indoor Positioning System

Cited by 4 publications

References 3 publications

Component-Wise Error Correction Method for UWB-Based Localization in Target-Following Mobile Robot

Component-Wise Error Correction Method for UWB-Based Localization in Target-Following Mobile Robot

Relative-Position Estimation Based on Loosely Coupled UWB–IMU Fusion for Wearable IoT Devices

Ultra-Wideband-Based Time Occupancy Analysis for Safety Studies

Contact Info

Product

Resources

About