High-accuracy Time-synchronization Technology for Low-latency, High-capacity Communications in the 5G and Beyond 5G eras

2021 ◽  
Vol 19 (12) ◽  
pp. 85-92
Author(s):  
Kaoru Arai ◽  
Makoto Murakami
Keyword(s):  
Time Synchronization ◽  
High Capacity ◽  
High Accuracy ◽  
Low Latency

Study on Aerospace Layering Time Synchronization Architecture and Time Synchronization Algorithm

2012 ◽  
Vol 546-547 ◽  
pp. 1614-1619
Author(s):  
Fei Jiang Huang ◽  
Xiao Chun Lu ◽  
Jun Yang ◽  
Qing Xiao Shan ◽  
Yong Bin Zhou
Keyword(s):  
Time Synchronization ◽  
Rapid Development ◽  
Frequency Standard ◽  
High Accuracy ◽  
Time Frequency ◽  
Aerospace Application ◽  
Visual Model ◽  
Application Systems ◽  
Synchronization Algorithm ◽  
Time And Frequency Standard

The rapid development of various kinds of aerospace application systems requires the appropriate high-accuracy time and frequency standard. This problem can be effectively solved by establishing suitable time and frequency standard in aerospace. Based on the establishment of aerospace satellite visual model, the simulation of satellite visual time on 3-layer constellation structure, including GEO satellite, IGSO satellites and MEO satellites, has been conducted. The visual features of this constellation have been gained. Combining with the major influencing factors of satellite clock correction error, aerospace time synchronization architecture on the basis of layering has been proposed. The time synchronization algorithm in line with this architecture has been researched. The results show that aerospace time frequency standard established based on this layering time synchronization architecture can meet the demand on high-accuracy time frequency of future aerospace application systems.

Enhancing sensitivity for emitter geolocation

2012 ◽  
Vol 4 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Göran Tengstrand ◽  
Peter Hultman ◽  
Jean-François Grandin ◽  
Dario Benvenuti ◽  
Börje Andersson ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Accuracy ◽  
Search Pattern ◽  
Low Latency ◽  
Time Of Arrival ◽  
Antenna Gain ◽  
Sufficient Data ◽  
Angle Of Arrival ◽  
Data Link ◽  
Very High

Angle of arrival (AOA), time of arrival (TOA), and frequency of arrival (FOA) can be measured for a signal from multiple platforms. By combining such measurements it is possible to obtain high-accuracy emitter position estimates. This requires a data link with low latency and sufficient data-rate, and synchronization of the platforms in space, time, and search pattern. Typically several of the platforms will have to make their measurements in the radar sidelobes that require very high receiver sensitivity. This paper focuses on discussing how the sensitivity can be improved using antenna gain or signal processing.

scholarly journals RoboDiff: combining a sample changer and goniometer for highly automated macromolecular crystallography experiments

2016 ◽  
Vol 72 (8) ◽  
pp. 966-975 ◽  
Author(s):  
Didier Nurizzo ◽  
Matthew W. Bowler ◽  
Hugo Caserotto ◽  
Fabien Dobias ◽  
Thierry Giraud ◽  
...  
Keyword(s):  
Data Collection ◽  
Diffraction Data ◽  
High Capacity ◽  
High Accuracy ◽  
Macromolecular Crystallography ◽  
Sample Changer ◽  
High Level

Automation of the mounting of cryocooled samples is now a feature of the majority of beamlines dedicated to macromolecular crystallography (MX). Robotic sample changers have been developed over many years, with the latest designs increasing capacity, reliability and speed. Here, the development of a new sample changer deployed at the ESRF beamline MASSIF-1 (ID30A-1), based on an industrial six-axis robot, is described. The device, named RoboDiff, includes a high-capacity dewar, acts as both a sample changer and a high-accuracy goniometer, and has been designed for completely unattended sample mounting and diffraction data collection. This aim has been achieved using a high level of diagnostics at all steps of the process from mounting and characterization to data collection. The RoboDiff has been in service on the fully automated endstation MASSIF-1 at the ESRF since September 2014 and, at the time of writing, has processed more than 20 000 samples completely automatically.

scholarly journals LiDAR Integrated High-Capacity IR OWC System with Abilities of Localization and Link Alignment

2021 ◽  
Author(s):  
Zhi Li
Keyword(s):  
Wireless Communication ◽  
Continuous Wave ◽  
Beam Steering ◽  
High Capacity ◽  
High Accuracy ◽  
Signal Beam ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Lidar System ◽  
Practical Applications

By using narrow infrared (IR) beams, optical wireless communication (OWC) system can realize ultra-high capacity and high-privacy transmission. However, due to the point-to-point connection approach, a high-accuracy localization system and beam-steering antenna (BSA) are required to steer the signal beam to user terminals. In addition, to achieve link alignment in the receiver, the BSA needs to be within the limited receiver field of view (FoV). This problem greatly limits the practical application of high-capacity IR optical wireless communication and has not been well solved yet. In this paper, we proposed an indoor beam-steering IR OWC system with high-accuracy and calibration-free localization ability by employing a coaxial frequency modulated continuous wave (FMCW) light detection and ranging (LiDAR) system. In the meantime, benefit from the mm-level ranging accuracy of the LiDAR system, a feasible approach to deal with the link alignment issue for practical applications is firstly demonstrated. With the assistance of the LiDAR system, we experimentally achieved the localization of user terminals with a 0.038-degree localization accuracy, link alignment at the receiver and an error-free on-off keying (OOK) downlink transmission of 20 Gb/s in free space at 3-m distance is demonstrated.

High Accuracy and High Capacity Motor Cooling System Using Phase Change of Refrigerant for Semiconductor Lithography Apparatus

2006 ◽  
pp. 329-330
Author(s):  
Alex Ka Tim Poon ◽  
Fukunosuke Nishimatsu ◽  
Masahiro Totsu ◽  
Leonard Kho ◽  
Gaurav Keswani
Keyword(s):  
Phase Change ◽  
Cooling System ◽  
High Capacity ◽  
High Accuracy ◽  
Motor Cooling

scholarly journals Low latency information transfer based on precision time synchronization via wireless interferometry

2021 ◽  
Vol 12 (2) ◽  
pp. 225-235
Author(s):  
Daijiro Koyama ◽  
Yunzhuo Wang ◽  
Nobuyasu Shiga ◽  
Satoshi Yasuda ◽  
Nicolas Chauvet ◽  
...  
Keyword(s):  
Information Transfer ◽  
Time Synchronization ◽  
Low Latency ◽  
Precision Time
Sign in / Sign up

Export Citation Format

Share Document