At ASTRON, the Netherlands Institute for Radio Astronomy, we are designing a new generation of radio telescopes. Traditionally, coaxial cables have been used to transport signals from the antenna to the processing facility. For our future telescopes, we aim to replace coaxial cables with optical fibre interconnects. This change requires a synchronised ADC to be implemented close to the...
In the recent years, Cherenkov telescopes have begun to be used for observations in the optical band using the technique of intensity interferometry. Intensity interferometry requires fast detectors—which Cherenkov telescopes already possess, as their cameras are comprised of photomultiplier tubes (PMTs)—as well as time synchronization between two telescopes to record data simultaneously and...
The talk will briefly cover the progress in the EISCAT 3D radar project during the last year and give details of the new possibility of time transfer between the radar sites.
To meet the High-Luminosity LHC demand for enhanced phase stability and replace the outdated RF and timing distribution system (called TTC backbone), an upgrade to a White Rabbit-based system is planned. A compliance test showed a phase variation of less than 30 ps in a proof-of-concept system. In order to assess the quality of the new system in real conditions a test campaign was started in...
This talk provides an overview about the most major steps on White Rabbit within MLE. We present our journey with the Dormouse Card and the enablement of it for ZCU102, ZCU106, ZCU111 platforms. Based on this development a bistatic RADAR setup has been built together with and at KIT. The respective setup is also used in 6G massive MIMO experiments.
As a side effect of the Dormouse related...
This paper presents the establishment and performance evaluation of White Rabbit (WR-PTP) and Precision Time Protocol (PTP) over a 12 km round-trip optical fiber link based on a telecom network, implemented at the Council of Scientific and Industrial Research – National Physical Laboratory (CSIR–NPL), New Delhi, India. Precise time and frequency synchronization is essential for a wide range of...
This short talk will cover WR features needed for guaranteeing a high standard of reliability and availability in telecom applications, such as an enterprise approach to network calibration during the network lifecycle.
The presentation will also introduce the concept of VTTNs (Virtual Time Transfer Networks) and their pivotal role in resilient distributed timescales using WR.
In March 2024 IQD presented at the White Rabbit Collaboration workshop. We gave the first details of a project in which we build an expansion board to be used in the new WRv4 switch. We had some great feedback last year regarding specific use cases for holdover in a White Rabbit environment.
This year we are happy to be back again and to be giving an update on the progress of this project. We...
An overview of the current real world problems on the Stage and Screen, alongside a brief overview of the current work we are carrying out at XPLOR & Production Park.
Usually the WR reference clock is the source of the WR timing signals (10MHz and PPS), however, for low phase noise it is profitable to use the output of the local oscillator.
In many White Rabbit systems the local oscillator has a different frequency than the White Rabbit reference clock which leads to a fixed number of possible phase lock positions.
Using the local oscillator directly...
In 2022, PTP became available to the masses thanks to the availability of the Raspberry Pi Compute Module 4 and its PTP compatible network interface [1], and now the Compute Module 5.
In the meantime, PTP High Accuracy's White Rabbit has remained confined to dedicated boards providing the external oscillators needed to generate the beatnote for fine phase measurement, until 2024's Missing...
The NSF POSE funded Open PHASE effort hosted by UNH-IOL is entering its second year and nearing readiness to support the needs of the White Rabbit Collaboration's certification process. This talk will update the WR Workshop attendees on the goals and mission of the Open PHASE effort, how to participate, steer and benefit from the effort.
