Experimental demonstration of nanosecond-accuracy wireless network synchronization

Abstract-Clock synchronization is ubiquitous in wireless systems for communication, sensing and control. In this paper we design a scalable system in which an indefinite number of passively receiving wireless units can synchronize to a single master clock at the level of discrete clock ticks. Accurate synchronization requires an estimate of the node positions. If such information is available the framework developed here takes position uncertainties into account. In the absence of such information we propose a mechanism which enables simultaneous synchronization and positioning. Furthermore we derive the Cramer-Rao bounds for the system which show that it enables synchronization accuracy at sub-nanosecond levels. Finally, we develop and evaluate an online estimation method which is statistically efficient.

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“…is a projector matrix. After inserting (21) into (20), the maximum likelihood estimate of x can be obtained by solvinǧ…”

Section: B Minimization Methodsmentioning

confidence: 99%

“…Time synchronization schemes are evolving to provide nanosecond-level synchronization, which requires accounting for signal time-of-flight between nodes. A scalable multihop scheme to synchronize the nodes to nanosecond accuracy was proposed in [20].…”

Section: A Prior Art and Our Contributionsmentioning

confidence: 99%

Scalable and Passive Wireless Network Clock Synchronization in LOS Environments

Zachariah

Dwivedi

Händel

et al. 2017

IEEE Trans. Wireless Commun.

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“…However, it has proved very challenging to realize, as the timer in each network node is derived from an independent oscillator which is affected by long/short term frequency drifts and jitter, and many alternative timekeeping methods present limitations in terms of precision or network size. [5] Locata Corporation, a privately-owned Australian company with a US subsidiary, has invented a new radiolocation technology that provides precise PNT in many environments where GPS coverage is marginal, unavailable, or actively denied for modern applications. Locata technology breakthroughs provide ground-based PNT capabilities that deliver positioning advances which, in many scenarios, far exceed the performance and reliability available from space-based GPS signals.…”

Section: Introductionmentioning

confidence: 99%

Wide Area Wireless Network Synchronization Using Locata

Powers¹,

Colina²

2016

The Precise Time and Time Interval Systems and Applications Meeting

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Mr. Powers began his civil servant career in 1987 working at the Naval Research Laboratory developing and testing GPS satellite atomic clocks. He provided support for the Navy PTTI program including work supporting the development of HP5071 Cesium clocks, GPS timing receivers and other Navy timing systems. Mr. Powers worked with various agencies on the development of remote deployed timing systems supporting the highest level user requirements. Mr. Powers was lead test engineer on the DISA Loran replacement program during which GPS timing systems were developed for deployment at over 400 remote DoD telecommunication sites. Mr. Powers was responsible for maintaining and upgrading all NRL PTTI clock measurement systems. Mr. Powers worked with the GPS joint program office assisting in development of the NAVWAR program, special research studies and various GPS user equipment test programs. In 1997, Mr. Powers joined the USNO Time Service Department providing expertise in the area of precise time transfer with a focus of GPS. Mr. Powers continue his advisory duties to the GPS program office supporting space atomic clock development, modernized GPS III navigation message design, GPS accuracy improvement studies, GPS UE development and test support to name a few. Working with DISA the USNO NTP program was moved to a dedicated DISA network circuit. Mr. Powers served on numerous technology readiness/assessment panels including GPS IIIA satellite program and the AEHF FAB-T program, both with a focus on atomic clocks and advanced time keeping systems. Mr. Powers is presently the GNSS and Network Time Transfer Operations Division Chief with a staff of 5 civil servants and 1 contractor. The GNSS Operations Division is charged with providing the UTC reference used by GPS as part of the GPS UTC timing service. He is also a member of the US Working Group on GNSS interoperability, with a focus on making the navigation time scales of each GNSS system interoperable. Over the past ten years, agreement on navigation and UTC time scale interoperability has been reached with QZSS, Galileo and GLONASS.

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“…This additional clock drift introduces a significant error in the accuracy of ranging, as demonstrated in this paper. We highlight that most of the results published in literature [79], [151] and [152] use costly equipment such as high-speed oscilloscope, field programmable gate array (FPGA), and TDC at the receiver, which gives the opportunity to precisely determine the pulse's TOA.…”

Section: State-of-the-artmentioning

confidence: 99%

“…In [151], [161], a non-coherent UWB system with two 8 bit-1.5 Gsps ADCs were used to sample the signal and a Virtex4 Xilinx FPGA was used to process the sampled data. Similarly, in [152] a real time sampling receiver with ADC sampling rate at 2.5 GSps was used along with the FPGA. Moreover, in [162], a receiver with 8 bit-2.88 GS/s real time sampling ADC was used along with FPGA.…”

Section: State-of-the-artmentioning

confidence: 99%

High resolution indoor localization system using ultra wideband impulse radio

Vashistha¹

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Assoc. Prof. Choi Look Law for providing me the opportunity to pursue higher degree. I am also thankful to him for providing me the invaluable project direction and imbibing in me, the professional ethics of work. I would also like to thank my thesis advisory committee Assoc. Prof. Tay Wee Peng and Assoc. Prof. A. S. Madhukumar for their invaluable suggestions. I extend my sincere thanks to Prof. Tay for his rigorous reviews, which has improved the quality of my thesis. Their excellent cooperation and suggestion provided me with an impetus to work and made the completion of work possible.Next, I am thankful to my mother Nikita Sharma who has raised me up in life against all odds with many sacrifices. I will always be indebted to her for the unconditional love, care, support, and blessings. Many thanks to my brother Ankur Vashistha for being a source of inspiration and showing me the directions in life. I want to extend a deepest gratitude to my wife Shubha Sharma who is a constant source of love, support and motivation for me. She encouraged me and stood by me in my lowest times. I want to thank all my family members for their continuous support.I am thankful to my research group members Dr. Manmohan Sharma, Mr. Arif Hussain for their help and suggestions during the period of my work. I am also thankful to all the staff members of

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Experimental demonstration of nanosecond-accuracy wireless network synchronization

Cited by 14 publications

References 11 publications

Scalable and Passive Wireless Network Clock Synchronization in LOS Environments

Scalable and Passive Wireless Network Clock Synchronization in LOS Environments

Wide Area Wireless Network Synchronization Using Locata

High resolution indoor localization system using ultra wideband impulse radio

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