Optical Fiber Trans-national Time Transfer for Comparing Two UTC Realisations

Dierikx, Erik; Xie, Yunhui; Veghel, Marijn van; Waller, P.; Valceschini, R.; Weber, Johannes; Plantinga, A.; Burger, B.; Koelemeij, J.C.J.; Tour, C. van; Savencu, A.; Coutereel, F.; Pirée, Hugo

doi:10.1109/fcs.2019.8856091

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…Existing optical networks, however, are typically designed to use fiber pairs with upstream optical data traveling in one direction through one fiber and downstream data traveling through the other. In such systems, a bidirectional wavelength channel for WR can nevertheless be achieved using WDM methods as these may also include dedicated bidirectional optical amplifiers for the WR optical signals (Lopez et al, 2010); (Dierikx et al, 2016); (Dierikx et al, 2019); (Smets, 2016); (Boven et al, 2019).…”

Section: Discussion and Outlookmentioning

confidence: 99%

“…WR has been shown to be compatible with optical amplifiers and the existing long-distance fiber-optic telecommunication infrastructure carrying live data traffic (Dierikx et al, 2016); (Boven et al, 2019); (Dierikx et al, 2019). A residual time offset between WR devices of 0.4 ns was demonstrated over a distance of 169 km (Boven et al, 2019).…”

Section: White Rabbitmentioning

confidence: 99%

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Decimeter Positioning in an Urban Environment Through a Scalable Optical-Wireless Network

Tiberius

Janssen

Koelemeij

et al. 2023

navi

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While global positioning systems (GPSs) play a significant role in modern life, they are far from perfect. GPSs and global navigation satellite systems (GNSSs) in general are critical assets for three-dimensional positioning, navigation, and timing (PNT) worldwide. GPSs have built a remarkable track-record since their inception, meeting set performance standards and achieving impressive up-times. GPSs have become a very popular PNT sensors in a large variety of applications, including vital functions such as sustainable energy grids, telecommunication networks, and electronic banking and trading, as well as aviation, logistics and transportation, and unmanned vehicle applications. However, GPSs have several shortcomings and vulnerabilities. Typically, GPSs perform worst where they are needed most, i.e., in densely-built urban areas. In these areas, satellite signals are frequently blocked by objects that are abundantly present in these environments. This may lead to a denial of its PNT functionality. Also, signals are frequently reflected by these objects; these detoured signals are received instead of or immediately adjacent to direct line-of-sight (LoS) signals, thereby degrading its PNT performance. In addition, several authorities have expressed increasing concern about the reliance of

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Section: Discussion and Outlookmentioning

confidence: 99%

Section: White Rabbitmentioning

confidence: 99%

Decimeter Positioning in an Urban Environment Through a Scalable Optical-Wireless Network

Tiberius

Janssen

Koelemeij

et al. 2023

navi

View full text Add to dashboard Cite

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“…Timefrequency reference distribution, over tens of kilometers with sub-nanosecond synchronization accuracy has been demonstrated [19]. High timing accuracy, at the 100 ps level, has already been demonstrated with WR [20], [21]. A 100 ps of timing error will generate 3 cm of ranging bias which may be acceptable for a decimeter level ranging or positioning system [22].…”

Section: B Testbed Synchronization Requirements and Solutionsmentioning

confidence: 99%

A USRP-Based Testbed for Wideband Ranging and Positioning Signal Acquisition

Diouf

Janssen

Dun

et al. 2021

IEEE Trans. Instrum. Meas.

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For validation and demonstration of high accuracy ranging and positioning algorithms and systems, a wideband radio signal generation and acquisition testbed, tightly synchronized in time and frequency, is needed. The development of such a testbed requires solutions to several challenges. Tight time and frequency synchronization, derived from a centrally distributed timefrequency reference signal, needs to be maintained in the hardware of the transmitter and receiver nodes, and wideband signal acquisition requires sustainable data throughput between receiver and host PC as well as data storage at GB level.This paper presents a testbed for wideband radio signal acquisition, for validation and demonstration of high accuracy ranging and positioning. It consists of multiple Ettus X310 USRPs and supports high accuracy (<100 ps) time-deterministic, sustainable signal transmission and acquisition, with a bandwidth up to 320 MHz (in dual channel mode) and frequencies up to 6 GHz. Generation and processing of wideband arbitrary signal waveforms, is done offline. To realize these features, RFNoC compatible HDL units were developed for integration in the X310 SDR platform. Wideband transmission and signal acquisition at a lower duty cycle is applied to reduce the data offloading throughput to the host PC. Benchmarking of the platform was performed to demonstrate sustainable long duration dual channel acquisition. Indoor range measurements with synchronous operation of the testbed show a decimeter-level accuracy.

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“…Time-frequency reference distribution, over tens of kilometers with sub-nanosecond synchronization accuracy, has been demonstrated [19]. High timing accuracy, at the 100-ps level, has already been demonstrated with WR [20], [21]. A 100 ps of timing error will generate 3 cm of ranging bias which may be acceptable for a decimeter level ranging or positioning system [22].…”

Section: B Testbed Synchronization Requirements and Solutionsmentioning

confidence: 99%

Accurate Differentially Private Deep Learning on the Edge

Han

Ouyang

et al. 2021

IEEE Trans. Parallel Distrib. Syst.

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For validation and demonstration of high accuracy ranging and positioning algorithms and systems, a wideband radio signal generation and acquisition testbed, tightly synchronized in time and frequency, is needed. The development of such a testbed requires solutions to several challenges. Tight time and frequency synchronization, derived from a centrally distributed time-frequency reference signal, needs to be maintained in the hardware of the transmitter and receiver nodes, and wideband signal acquisition requires sustainable data throughput between the receiver and host PC as well as data storage at GB level. This article presents a testbed for wideband radio signal acquisition, for validation and demonstration of high accuracy ranging and positioning. It consists of multiple Ettus X310 universal software radio peripherals (USRPs) and supports high accuracy (<100 ps) time-deterministic, sustainable signal transmission and acquisition, with a bandwidth up to 320 MHz (in dual channel mode) and frequencies up to 6 GHz. Generation and processing of wideband arbitrary signal waveforms is done offline. To realize these features, radio frequency on chip (RFNoC) compatible HDL units were developed for integration in the X310 SDR platform. Wideband transmission and signal acquisition at a lower duty cycle is applied to reduce the data offloading throughput to the host's personal computer (PC). Benchmarking of the platform was performed to demonstrate sustainable long duration dual channel acquisition. Indoor range measurements with the synchronous operation of the testbed show a decimeter-level accuracy.

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Optical Fiber Trans-national Time Transfer for Comparing Two UTC Realisations

Cited by 7 publications

References 5 publications

Decimeter Positioning in an Urban Environment Through a Scalable Optical-Wireless Network

Decimeter Positioning in an Urban Environment Through a Scalable Optical-Wireless Network

A USRP-Based Testbed for Wideband Ranging and Positioning Signal Acquisition

Accurate Differentially Private Deep Learning on the Edge

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