UWB Positioning Systsem Design: Selection of Modulation and Multiple Access Schemes

2007 ◽  
Vol 61 (1) ◽  
pp. 45-62 ◽  
Author(s):  
Hui Yu ◽  
Enrique Aguado ◽  
Gary Brodin ◽  
John Cooper ◽  
David Walsh ◽  
...  
Keyword(s):  
Multiple Access ◽  
High Performance ◽  
Ultra Wideband ◽  
Good Time ◽  
Modulation Scheme ◽  
Positioning System ◽  
Indoor Environments ◽  
Signal Design ◽  
Positioning Systems ◽  
Design Selection

In densely-populated cities or indoor environments, limited visibility to satellites and severe multipath effects significantly affect the accuracy and reliability of satellite-based positioning systems. To meet the needs of “seamless navigation” in these challenging environments an advanced terrestrial positioning system is under development. This system is based upon Ultra-Wideband (UWB) technology, which is a promising candidate for this application due to good time domain resolution and immunity to multipath. This paper presents a detailed analysis of two key aspects of the UWB signal design that will allow it to be used as the basis of such a high performance positioning system: the modulation scheme and the multiple access technique. These two aspects are evaluated in terms of spectral efficiency and synchronisation performance over multipath channels. Thus this paper identifies optimal modulation and multiple access techniques for a long range, high performance terrestrial positioning system using UWB.

scholarly journals Scale up to infinity: the UWB Indoor Global Positioning System

2021 ◽  
Author(s):  
Luca Santoro ◽  
Davide Brunelli ◽  
daniele fontanelli ◽  
matteo nardello
Keyword(s):  
Scale Up ◽  
Active Role ◽  
Maximum Error ◽  
Absolute Maximum ◽  
Positioning System ◽  
Indoor Environments ◽  
Positioning Systems ◽  
Transmission Mechanisms ◽  
Local Positioning System ◽  
Update Rate

Determining assets position with high accuracy and scalability is one of the most investigated technology on the market. The accuracy provided by satellites-based positioning systems (i.e., GLONASS or Galileo) is not always sufficient when a decimeter-level accuracy is required or when there is the need of localising entities that operate inside indoor environments. Scalability is also a recurrent problem when dealing with indoor positioning systems. This paper presents an innovative UWB Indoor GPS-Like local positioning system able to tracks any number of assets without decreasing measurements update rate. To increase the system’s accuracy the mathematical model and the sources of uncertainties are investigated. Results highlight how the proposed implementation provides positioning information with an absolute maximum error below 20 cm. Scalability is also resolved thanks to DTDoA transmission mechanisms not requiring an active role from the asset to be tracked.

scholarly journals Multi-Sensor Accurate Forklift Location and Tracking Simulation in Industrial Indoor Environments

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1152 ◽  
Author(s):  
Valentín Barral ◽  
Pedro Suárez-Casal ◽  
Carlos J. Escudero ◽  
José A. García-Naya
Keyword(s):  
Inertial Sensor ◽  
Wireless Channel ◽  
Good Choice ◽  
Ultra Wideband ◽  
Positioning System ◽  
Indoor Environments ◽  
Location Algorithm ◽  
Industrial Environments ◽  
Indoor Scenarios ◽  
Industrial Problem

Location and tracking needs are becoming more prominent in industrial environments nowadays. Process optimization, traceability or safety are some of the topics where a positioning system can operate to improve and increase the productivity of a factory or warehouse. Among the different options, solutions based on ultra-wideband (UWB) have emerged during recent years as a good choice to obtain highly accurate estimations in indoor scenarios. However, the typical harsh wireless channel conditions found inside industrial environments, together with interferences caused by workers and machinery, constitute a challenge for this kind of system. This paper describes a real industrial problem (location and tracking of forklift trucks) that requires precise internal positioning and presents a study on the feasibility of meeting this challenge using UWB technology. To this end, a simulator of this technology was created based on UWB measurements from a set of real sensors. This simulator was used together with a location algorithm and a physical model of the forklift to obtain estimations of position in different scenarios with different obstacles. Together with the simulated UWB sensor, an additional inertial sensor and optical sensor were modeled in order to test its effect on supporting the location based on UWB. All the software created for this work is published under an open-source license and is publicly available.

scholarly journals Scale up to infinity: the UWB Indoor Global Positioning System

2021 ◽  
Author(s):  
Luca Santoro ◽  
Davide Brunelli ◽  
daniele fontanelli ◽  
matteo nardello
Keyword(s):  
Scale Up ◽  
Active Role ◽  
Maximum Error ◽  
Absolute Maximum ◽  
Positioning System ◽  
Indoor Environments ◽  
Positioning Systems ◽  
Transmission Mechanisms ◽  
Local Positioning System ◽  
Update Rate

Determining assets position with high accuracy and scalability is one of the most investigated technology on the market. The accuracy provided by satellites-based positioning systems (i.e., GLONASS or Galileo) is not always sufficient when a decimeter-level accuracy is required or when there is the need of localising entities that operate inside indoor environments. Scalability is also a recurrent problem when dealing with indoor positioning systems. This paper presents an innovative UWB Indoor GPS-Like local positioning system able to tracks any number of assets without decreasing measurements update rate. To increase the system’s accuracy the mathematical model and the sources of uncertainties are investigated. Results highlight how the proposed implementation provides positioning information with an absolute maximum error below 20 cm. Scalability is also resolved thanks to DTDoA transmission mechanisms not requiring an active role from the asset to be tracked.

scholarly journals Crowdsensing Influences and Error Sources in Urban Outdoor Wi-Fi Fingerprinting Positioning

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 427 ◽  
Author(s):  
Cristian-Liviu Leca ◽  
Ioan Nicolaescu ◽  
Petrica Ciotirnae
Keyword(s):  
Signal Strength ◽  
Location Based Services ◽  
Valuable Insight ◽  
Positioning System ◽  
Indoor Environments ◽  
Error Sources ◽  
Positioning Systems ◽  
Long Time ◽  
Insight Into

Wi-Fi fingerprinting positioning systems have been deployed for a long time in location-based services for indoor environments. Combining mobile crowdsensing and Wi-Fi fingerprinting systems could reduce the high cost of collecting the necessary data, enabling the deployment of the resulting system for outdoor positioning in areas with dense Wi-Fi coverage. In this paper, we present the results attained in the design and evaluation of an urban fingerprinting positioning system based on crowdsensed Wi-Fi measurements. We first assess the quality of the collected measurements, highlighting the influence of received signal strength on data collection. We then evaluate the proposed system by comparing the influence of the crowdsensed fingerprints on the overall positioning accuracy for different scenarios. This evaluation helps gain valuable insight into the design and deployment of urban Wi-Fi positioning systems while also allowing the proposed system to match GPS-like accuracy in similar conditions.

scholarly journals UWB/Binocular VO Fusion Algorithm Based on Adaptive Kalman Filter

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4044
Author(s):  
Qingxi Zeng ◽  
Dehui Liu ◽  
Chade Lv
Keyword(s):  
Kalman Filter ◽  
Measurement Data ◽  
Ultra Wideband ◽  
Positioning System ◽  
Adaptive Kalman Filter ◽  
Fusion Algorithm ◽  
Position Information ◽  
Positioning Systems ◽  
Visual Odometer ◽  
Navigation Accuracy

Among the existing wireless indoor positioning systems, UWB (ultra-wideband) is one of the most promising solutions. However, the single UWB positioning system is affected by factors such as non-line of sight and multipath, and the navigation accuracy will decrease. In order to make up for the shortcomings of a single UWB positioning system, this paper proposes a scheme based on binocular VO (visual odometer) and UWB sensor fusion. In this paper, the original distance measurement data of UWB and the position information of binocular VO are merged by adaptive Kalman filter, and the structural design of the fusion system and the realization of the fusion algorithm are elaborated. The experimental results show that compared with a single positioning system, the proposed data fusion method can significantly improve the positioning accuracy.

scholarly journals Crowdsensing Influences and Error Sources in Urban Wi-Fi Fingerprinting Positioning

2019 ◽  
Author(s):  
Cristian-Liviu Leca ◽  
Ioan Nicolaescu ◽  
Petrica Ciotirnae
Keyword(s):  
Signal Strength ◽  
Location Based Services ◽  
Valuable Insight ◽  
Positioning System ◽  
Indoor Environments ◽  
Error Sources ◽  
Positioning Systems ◽  
Long Time ◽  
Insight Into

Wi-Fi fingerprinting positioning systems have been deployed for a long time in location-based services for indoor environments. Combining mobile crowdsensing and Wi-Fi fingerprinting systems could reduce the high cost for collecting the necessary data enabling the deployment of the resulting system for outdoor positioning in areas with dense Wi-Fi coverage. In this paper, we present the results attained in the designing and evaluation of an urban fingerprinting positioning system based on crowdsensed Wi-Fi measurements. We first asses the quality of the collected measurements, highlighting the influence of received signal strength on data collection. We then, evaluate the proposed system by comparing the influence of the crowdsensed fingerprints on the overall positioning accuracy for different scenarios. The evaluation helps gain valuable insight into the design and deployment of urban Wi-Fi positioning systems while also allowing the proposed system to match GPS-like accuracy in similar conditions.

scholarly journals Design of Interference-Resilient Medium Access for High Throughput WLANs

2015 ◽  
Vol 2015 ◽  
pp. 1-13
Author(s):  
Luca Reggiani ◽  
Andrea Gola ◽  
Gian Mario Maggio ◽  
Gianluigi Tiberi
Keyword(s):  
Multiple Access ◽  
Network Performance ◽  
High Capacity ◽  
Local Area ◽  
Ultra Wideband ◽  
Indoor Environments ◽  
Performance Study ◽  
Medium Access ◽  
Code Division Multiple ◽  
Control Layer

The proliferation of wireless communications systems poses new challenges in terms of coexistence between heterogeneous devices operating within the same frequency bands. In fact, in case of high-density concentration of wireless devices, like indoor environments, the network performance is typically limited by the mutual interference among the devices themselves, such as for wireless local area networks (WLANs). In this paper, we analyze a protocol strategy for managing multiple access in wireless networks. A network of sensors colocated with the WLAN terminals forms a control layer for managing the medium access and scheduling resources in order to limit collisions and optimize the WLAN data traffic; this control layer is based on a low-power wideband technology characterized by interference robustness, like CDMA (code division multiple access) or UWB (ultra-wideband) for sensors. In this work, we perform an analytical and simulative performance study of the saturated throughput, showing numerical results for the UWB-IR (Impulse Radio) sensors case and highlighting the advantage that can be provided particularly in very high capacity systems, which constitute the necessary evolution of current WLAN versions.

Design and Nanomotion Control of a Noncontact Stage with Squeeze Bearings

2008 ◽  
Vol 2 (1) ◽  
pp. 18-23 ◽  
Author(s):  
Hayato Yoshioka ◽  
◽  
Toshimichi Gokan ◽  
Hidenori Shinno ◽  
Keyword(s):  
High Performance ◽  
Positioning System ◽  
Positioning Systems ◽  
Design Concepts ◽  
Wide Range

As the need to develop high-performance highly accurate positioning has grown in a wide range of industries, it has become necessary to comprehensively study desirable stage positioning systems based on new design concepts. Achieving nanometer positioning requires simultaneous noncontact drive and support of the moving stage. We developed a linear motordriven stage positioning system with squeeze bearings and evaluated squeeze bearing and positioning performance of the proposed positioning system through a series of actual stage driving experiments that confirmed the stage's nanopositioning capability.

INTERFERER REJECTION IMPROVED BY NOISE IN ULTRA-WIDEBAND TELECOMMUNICATIONS

2006 ◽  
Vol 06 (03) ◽  
pp. L317-L328 ◽  
Author(s):  
JOCELYN FIORINA ◽  
DAVID ROUSSEAU ◽  
FRANÇOIS CHAPEAU-BLONDEAU
Keyword(s):  
Signal Processing ◽  
Gaussian Noise ◽  
Multiple Access ◽  
High Speed ◽  
High Accuracy ◽  
Ultra Wideband ◽  
Positioning Systems ◽  
Very High ◽  
Low Rate ◽  
External Impulse

Ultra-wideband technology uses baseband transmission of low-power ultra-short information-bearing impulses, and represents a promising approach for very-high speed wireless communications with multiple access, as well as for low-rate high-accuracy positioning systems. The first demonstrations of the huge potential of ultra-wideband were based on hypotheses of perfect power control and multiuser interferences modeled as white Gaussian noise. Here, by explicitly modeling the interference with an external impulse signal, we demonstrate the possibility of improving the rejection of the interferer thanks to a constructive action of the noise. This is interpreted as a novel instance of the phenomenon of stochastic resonance or improvement by noise in signal processing.

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