Investigation of white rabbit for synchronization and timing of netted radar

Inggs, Michael; Sandenbergh, J.S.; Lewis, Simon

doi:10.1109/radarconf.2015.7411882

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…Prior research has shown optical fiber clock distribution to 1000-ports with jitter less than 12 ps, using mode-locked semiconductor lasers [66]. Reliant on the use of a dedicated 1 Gbps synchronization plane, the White Rabbit project can achieve a clock accuracy better than 1ns and precision better than 50 ps spanning distances over 10km [67].…”

Section: Synchronization and Cdr Lockingmentioning

confidence: 99%

PULSE: Optical circuit switched Data Center architecture operating at nanosecond timescales

Benjamin¹,

Gerard²,

Lavery³

et al. 2020

Preprint

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We introduce PULSE, a sub-µs optical circuit switched data centre network architecture controlled by distributed hardware schedulers. PULSE is a flat architecture that uses parallel passive coupler-based broadcast and select networks. We employ a novel transceiver architecture, for dynamic wavelength-timeslot selection, to achieve a reconfiguration time down to O(100ps), establishing timeslots of O(10ns). A novel scheduling algorithm that has a clock period of 2.3ns performs multiple iterations to maximize throughput, wavelength usage and reduce latency, enhancing the overall performance. In order to scale, the single-hop PULSE architecture uses sub-networks that are disjoint by using multiple transceivers for each node in 64 node racks. At the reconfiguration circuit duration (epoch = 120 ns), the scheduling algorithm is shown to achieve up to 93% throughput and 100% wavelength usage of 64 wavelengths, incurring an average latency that ranges from 0.7-1.2 µs with best-case 0.4 µs median and 5 µs tail latency, limited by the timeslot (20 ns) and epoch size (120 ns). We show how the 4096node PULSE architecture allows up to 260k optical channels to be re-used across sub-networks achieving a capacity of 25.6 Pbps with an energy consumption of 85 pJ/bit.

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Section: Synchronization and Cdr Lockingmentioning

confidence: 99%

PULSE: Optical circuit switched Data Center architecture operating at nanosecond timescales

Benjamin¹,

Gerard²,

Lavery³

et al. 2020

Preprint

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“…Their measurement of WRPTP's performance demonstrate sub-nanosecond accuracy over a 5km fiber optic link with a precision below 10ps and a reduced PTP-message exchange rate. Further application of WR like [22] has proved that PTP can provide extremely high timing precision in almost any wired network.…”

Section: B Ptp Applicationmentioning

confidence: 99%

“…Together with hardware and statistical compensation algorithms like Kalman filtering [15] and White Rabbit [29], PTP is presently the most accurate E2E timing method in wired network, especially in optical networks. Many wireless timing methods are optimized for specific networks, applying PTP in those networks is often used as a benchmark [30].…”

Section: A Precision Time Protocolmentioning

confidence: 99%

TAP: A High-Precision Network Timing Method Over Air Interface Based on Physical-Layer Signals

Zhang¹,

Zheng²,

Wang³

2019

IEEE Access

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Absolute time synchronization (timing) is a constant demand in various fields. There are many timing techniques at present. They are mainly based on dedicated equipments such as GNSS or specific protocols such as NTP, PTP, SIB16, etc. Different timing methods are applied according to the scenario, cost and demands for timing accuracy. Recently, the timing demands for some wireless scenarios have become increasingly urgent, like power IoT and auto-driving. However, due to the instability and complexity of radio link, the current methods can hardly meet the demands of high-precision and low cost simultaneously in mobile network. Here we propose a timing method over air interface based on physical layer signals (TAP). Periodic physical layer signals in both downlink and uplink channel are considered to reduce the impact of radio link instability on timing. We implemented the proposed method on an open source LTE software defined radio platform named OpenAirInterface and conducted a series of tests. Our tests prove that TAP can provide microsecond-level timing over the air interface, and it is more stable and precise than PTP. Further simulation shows that using TAP in 5G NR can improve the timing accuracy. INDEX TERMS Air interface, high-precision timing, IoT, physical layer, time synchronization.

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“…Typical time transfer accuracy capabilities of between 1 and 10 ns have been reported using co-axial cable [4], however signal dispersion/attenuation will considerably limit achievable baselines using this method. Longer baselines and higher accuracies have been reported for time transfer using fibre-optics [4][5][6][7][8]. White Rabbit (WR)-a fibre optic based precision time protocol (PTP) originally developed for the Large Hadron Collider project-has been shown to provide sub-nanosecond synchronisation via fibre-optic links [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…In previous literature Lewis et al investigate the use of the WR PTP for synchronisation of multistatic pulse-Doppler radar in Refs. [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Global Navigation Satellite Systems disciplined oscillator synchronisation of multistatic radar

Beasley,

Peters,

Horne

et al. 2023

IET Radar Sonar & Navi

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A fundamental challenge in the practical implementation of multistatic radar systems (MSRS) is the requirement for precise time and frequency synchronisation between the spatially separated radar nodes. The authors evaluate the performance of different classes of commercially available Global Navigation Satellite Systems (GNSS) timing receivers, Local Oscillators (LO) and GNSS Disciplined Oscillators (GNSSDOs) to determine the limitations of using one‐way GNSS Time and Frequency Transfer (TFT) in this application. From evaluating the performance of three pairs of GNSSDOs, it is concluded that one‐way GNSS TFT will likely be suitable only for the synchronisation of fully spatially coherent MSRS with carrier frequencies up to 100 MHz and waveform bandwidths up to 20 MHz. Whereas, in the case of short‐term spatially coherent MSRS, synchronisation of systems with carrier frequencies up to a few GHz and waveform bandwidths of over 100 MHz will likely be possible. The performance of the different classes of GNSSDOs during GNSS denial (holdover) are evaluated, where it is concluded that frequency offsets between LOs at the point of GNSS denial will often significantly contribute, or even dominate, the holdover performance. Analysis of two practical multistatic radar measurements verifies the function of using the GNSSDOs for wireless synchronisation of the ARESTOR MSRS.

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Investigation of white rabbit for synchronization and timing of netted radar

Cited by 11 publications

References 5 publications

PULSE: Optical circuit switched Data Center architecture operating at nanosecond timescales

PULSE: Optical circuit switched Data Center architecture operating at nanosecond timescales

TAP: A High-Precision Network Timing Method Over Air Interface Based on Physical-Layer Signals

Global Navigation Satellite Systems disciplined oscillator synchronisation of multistatic radar

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