scholarly journals Hybsync: Nanosecond Wireless Position and Clock Synchronization Based on UWB Communication with Multisensors

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Pengyu Lei ◽  
Zhitian Li ◽  
Bo Xue ◽  
Haifeng Zhang ◽  
Xudong Zou
Keyword(s):  
High Precision ◽  
Clock Synchronization ◽  
Inertial Sensor ◽  
Cooperative Work ◽  
Two Phase ◽  
Work Systems ◽  
Application Problem ◽  
Deviation Measurement ◽  
Time Information ◽  
Uwb Communication

PNT (positioning, navigation, and timing) is the core functional part of kinds of wireless sensor network, which can provide high-precision timing and positioning services for cooperative work systems. Unfortunately, the mature wireless PNT schemes are generally based on GNSS and other auxiliary sources to complete the high accuracy synchronization process, which cannot be applied to GNSS degraded and denied environments such as mines, underground application. In order to solve the application problem of high-precision wireless PNT, Hybsync—a novel non-GNSS-aided wireless PNT architecture, is proposed in this paper, which integrates the information from the UWB communication, inertial sensor, and camera to achieve great PNT performance. Hybsync improves the accuracy of time deviation measurement by collecting and recording timestamps in hardware layer, and with the coarse/fine synchronization two-phase calibration, Hybsync greatly improves the accuracy of time deviation adjustment, thus providing accurate time information for the whole system. Besides, Hybsync uses the VINS framework to further integrate the real-time information of IMU and camera to complete the multinode positioning service. Under the premise that the cost is much lower than existing solutions, Hybsync can provide nanosecond-level clock synchronization and centimeter-level positioning. Experiments prove that Hybsync supports high-precision clock synchronization and positioning of more than 10 nodes; the maximum clock synchronization error is 3 ns, and the positioning error is 7 cm. It can provide accurate time and position services for cooperative work systems under complex and GNSS-denied conditions.

Analysis of Influence of Ephemeris-Time Information on Accuracy of Solving a Navigation Problem by Signals of GLONASS System

2020 ◽  
Vol 25 (5) ◽  
pp. 465-474
Author(s):  
V.O. Zhilinskiy ◽  
◽  
D.S. Pecheritsa ◽  
L.G. Gagarina ◽  
◽  
...  
Keyword(s):  
High Precision ◽  
Satellite Navigation ◽  
Satellite System ◽  
Navigation Systems ◽  
Navigation Problem ◽  
Satellite Navigation System ◽  
Study Results ◽  
Accuracy Of Measurements ◽  
Huge Impact ◽  
Time Information

The Global Navigation Satellite System has a huge impact on both the public and private sectors, including the social-economic development, it has many applications and is an integral part of many domains. The application of the satellite navigation systems remains the most relevant in the field of transport, including land, air and maritime transport. The GLONASS system consists of three segments and the operation of the entire system depends on functioning of each component, but primarily, the accuracy of measurements depends on the basis forming of the control segment and management, responsible for forming ephemeris-time information. In the work, the influence of ephemeris-time information on the accuracy of solving the navigation problem by the signals of the GLONASS satellite navigation system has been analyzed. The influence of both ephemeris information and the frequency information, and of the time corrections has been individually studied. The accuracy of the ephemeris-time information is especially important when solving the navigation problem by highly precise positioning method. For the analysis the following scenarios of the navigation problem solving have been formed: using high-precision and broadcast ephemeris-time information, a combination of broadcast (high-precision) ephemeris-time information, and high-precision (broadcast) satellite clock offsets and two scenarios with simulation of the calculation of the relative correction to the radio signal carrier frequency. Based on the study results it has been concluded that the contribution of the frequency-time corrections to the error of location determination is of the greatest importance and a huge impact on the error location, while the errors of the ephemeris information are insignificant

scholarly journals Self-reported use of technology by orientation and mobility clients in Australia and Malaysia before the COVID-19 pandemic

2021 ◽  
pp. 026461962110190
Author(s):  
Lil Deverell ◽  
Jahar Bhowmik ◽  
Abdullah Al Mahmud ◽  
Bee Theng Lau ◽  
Fakir M Amirul Islam ◽  
...  
Keyword(s):  
Low Vision ◽  
Two Phase ◽  
Face To Face ◽  
Use Of Technology ◽  
Orientation And Mobility ◽  
Independent Travel ◽  
The 1960S ◽  
In Transit ◽  
Real Time Information ◽  
Time Information

Since the 1960s, many electronic travel aids have been developed for people with low vision or blindness to improve their independent travel skills, but uptake of these specialist devices has been limited. This study investigated what technologies orientation and mobility (O&M) clients in Australia and Malaysia have, use, like, and want to support their travel, to inform technology research and development. This two-phase mixed-methods study surveyed O&M clients face-to-face in Malaysia ( n = 9), and online in Australia ( n = 50). Participants managed safe walking using a human guide, long cane, or guide dog when their vision was insufficient to see hazards, but a smartphone is now a standard travel aid in both Australia and Malaysia. Participants relied on smartphone accessibility features and identified 108 apps they used for travel: for planning (e.g., public transport timetables), sourcing information in transit (e.g., GPS location and directions, finding a taxi), sensory conversion (e.g., camera-to-voice, voice-to-text, video-to-live description), social connections (e.g., phone, email, Facebook), food (e.g., finding eateries, ordering online), and entertainment (e.g., music, games). They wanted to ‘carry less junk’, and sought better accessibility features, consistency across platforms, and fast, reliable, real-time information that supports confident, non-visual travel, especially into unfamiliar places.

A Methodology for Remote Debug, Test and Maintenance Based on IEEE 1588

2011 ◽  
Author(s):  
Peter Ro¨ssler ◽  
Roland Ho¨ller ◽  
Martin Zauner
Keyword(s):  
High Precision ◽  
Clock Synchronization ◽  
Automotive Electronics ◽  
Mechatronic Systems ◽  
Ieee 1588 ◽  
Remote Testing ◽  
Synchronization Protocol ◽  
Precision Clock

This work describes a new methodology for the purpose of remote testing, debugging and maintenance of networked electronic and mechatronic systems which makes use of the IEEE 1588 high-precision clock synchronization protocol. After the underlying concepts of IEEE 1588 are briefly sketched, the paper describes how functionalities like testing, debugging and maintenance can benefit from a network-wide notion of time as provided by the IEEE 1588 standard. An implementation of the IEEE 1588 protocol with support for test, debug and maintenance as well as links to the integration of the proposed concept into existing tools are presented. Further, the proposed approach is discussed under consideration of recent standardization efforts. Finally, a case study from the area of automotive electronics is described.

scholarly journals Single-Element Dual-Interferometer for Precision Inertial Sensing

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4986
Author(s):  
Yichao Yang ◽  
Kohei Yamamoto ◽  
Victor Huarcaya ◽  
Christoph Vorndamme ◽  
Daniel Penkert ◽  
...  
Keyword(s):  
High Precision ◽  
Degrees Of Freedom ◽  
Dynamic Range ◽  
Inertial Sensor ◽  
Single Element ◽  
Inertial Sensing ◽  
Optical Readout ◽  
One Step ◽  
Isolation Systems ◽  
Laser Interferometers

Tracking moving masses in several degrees of freedom with high precision and large dynamic range is a central aspect in many current and future gravitational physics experiments. Laser interferometers have been established as one of the tools of choice for such measurement schemes. Using sinusoidal phase modulation homodyne interferometry allows a drastic reduction of the complexity of the optical setup, a key limitation of multi-channel interferometry. By shifting the complexity of the setup to the signal processing stage, these methods enable devices with a size and weight not feasible using conventional techniques. In this paper we present the design of a novel sensor topology based on deep frequency modulation interferometry: the self-referenced single-element dual-interferometer (SEDI) inertial sensor, which takes simplification one step further by accommodating two interferometers in one optic. Using a combination of computer models and analytical methods we show that an inertial sensor with sub-picometer precision for frequencies above 10 mHz, in a package of a few cubic inches, seems feasible with our approach. Moreover we show that by combining two of these devices it is possible to reach sub-picometer precision down to 2 mHz. In combination with the given compactness, this makes the SEDI sensor a promising approach for applications in high precision inertial sensing for both next-generation space-based gravity missions employing drag-free control, and ground-based experiments employing inertial isolation systems with optical readout.

scholarly journals A runtime stability analysis of clock synchronization precision on a time-triggered bus prototype

2009 ◽  
Vol 20 (1) ◽  
pp. 45-52
Author(s):  
Fabiano C. Carvalho ◽  
Carlos E. Pereira
Keyword(s):  
Stability Analysis ◽  
Distributed Systems ◽  
High Precision ◽  
Can Bus ◽  
Clock Synchronization ◽  
Time Base ◽  
Embedded Control ◽  
Control Applications ◽  
Synchronization Algorithm ◽  
Transmission Schedule

This paper provides a runtime stability analysis of the Daisy-Chain clock synchronization algorithm running over CASCA - a time-triggered extension of CAN bus. The main objective is to show with practical results how to achieve global time base of high precision and how this precision is affected by the modification of the TDMA transmission schedule. That contributes by providing some basic guidelines for the task of designing time-triggered, TDMA-based distributed systems for embedded control applications.

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