Microsecond accuracy at multiple sites: is it possible without GPS?

Lombardi, Michael A.

doi:10.1109/mim.2012.6314510

Cited by 22 publications

(9 citation statements)

References 17 publications

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“…Despite of the high accuracy it has numerous disadvantages as it entails that all the participating nodes are furnished with a GPS receiver. Outdoor GPS antennas are obligatory in many scenarios; these outdoor antennas are susceptible to vandalism and cannot be installed in underground substations [20,22].…”

Section: ) Gps-based Time Synchronizationmentioning

confidence: 99%

IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

et al. 2020

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Precise time synchronization becomes a vital constituent due to the rigorous needs of several time-sensitive applications. The clock synchronization protocol is one of the fundamental factors that can define the quality of communication. Our study starts with a brief discussion on the application domain of precise time synchronization and comes with an in-depth study of the synchronization with the main focus on the IEEE 1588 Precision Time Protocol (PTP). We have compared the well-known synchronization techniques and conclude that the PTP is the most appropriate answer to robust clock synchronization though challenges are there that requires thoughtful efforts and modification in the current version. The working mechanism and main components of the PTP network are discussed. We have established a testbench using commercially available devices and development boards to evaluate the PTP performance under different configurations. Major sources of synchronization error and other aspects contributing to precision are examined. This paper discussed numerous approaches that could enhance the performance of the PTP protocol. Structures for PTP based wireless clock synchronization required by advanced applications has also been discussed. In the end, paper focuses on the main industrial application areas in which PTP plays an important role, including WLAN, optical data centers, Smart grid, IEC 61850, etc. We conclude the paper by identifying the future trends and research directions for PTP based clock synchronization.

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Section: ) Gps-based Time Synchronizationmentioning

confidence: 99%

IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

et al. 2020

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“…Frequency synchronization is also required by mobile system to facilitate handover between base stations and meet the regulatory requirement [12]. Currently, the base stations are usually equipped with the global navigation satellite system (GNSS) equipment, which can support sub-microsecond accuracy for general receivers [13], and reach a accuracy of less than 5 ns with respect to UTC with dual-frequency receivers for time-keeping purposes [14]. Although most synchronization requirements can be easily satisfied by using GNSS signals, the reception of GNSS antenna needs a good view of sky.…”

Section: Evolving Telecom Synchronization Networkmentioning

confidence: 99%

Precise UTC dissemination through future telecom synchronization networks

Tseng

Siu

Lin

et al. 2015

2015 Joint Conference of the IEEE International Frequency Control Symposium &Amp; The European Frequency and Time Forum

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Precise time has become an essential service for most critical infrastructures. The development of telecommunication synchronization networks may facilitate the use of precise time, which will be a great benefit to a large number of devices connected to the Internet. This paper introduces our preliminary work to evaluate the dissemination of precise time reference through a potential telecom synchronization network. With synchronous Ethernet and IEEE1588v2 on-path support (including Telecom Boundary Clocks), time transfer can be accurate at the level of 100 ns. The other challenges of compensating network asymmetry and establishing traceability to Coordinated Universal Time (UTC) are discussed.

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“…The Loran‐C system functions in the radio frequency of 90–110 kHz . In recent years, the use of the Loran system in navigation has been the focus of attention due to new methods for potential improvement via hardware and processing as well as protection from jamming . One of the most important sources of error in the Loran system is interference arising from received pulses from two different Loran chains that are coincident with each other.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cross-Rate Interference Cancelation by Use of a Novel Phase Code Interval in Loran Navigation System

Bayat

Madani

2017

J Inst Navig

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This work concentrates on improving performance of the Loran system with rejection of cross-rate interference (CRI) by the use of a new phase code interval, the so-called Bayat Phase Code Interval (BPCI), and on the signal in the frequency domain. Indeed, interference will be canceled by removing the common spectral lines between main and interference chains in all integer coefficients of the greatest common divisor frequency of two code intervals. In addition, all interference originating from sky waves that have delay greater than 700 μs is removed by employing both the presented phase code and averaging algorithm. The results demonstrate that if the design is desirable, in the sense that the inverse of the greatest common divisor of BPCI of the considered chain with adjacent interfering chains is equal to an integer multiple of 0.5 kHz, then the proposed BPCI rejects all of the spectral lines of the undesired chain.

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Microsecond accuracy at multiple sites: is it possible without GPS?

Cited by 22 publications

References 17 publications

IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

IEEE 1588 for Clock Synchronization in Industrial IoT and Related Applications: A Review on Contributing Technologies, Protocols and Enhancement Methodologies

Precise UTC dissemination through future telecom synchronization networks

Analysis of Cross-Rate Interference Cancelation by Use of a Novel Phase Code Interval in Loran Navigation System

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