A White Rabbit-Synchronized Accurate Time-Stamping Solution for the Small-Sized Cameras of the Cherenkov Telescope Array

Sanchez-Garrido, Jorge; Jurado, Antonio; Jiménez-López, Miguel; Balzer, A.; Prokoph, H.; Stéphan, M.; Berge, D.; Rodríguez-Álvarez, Manuel; Díaz, Javier

doi:10.1109/tim.2020.3013343

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…The clock and the PPS signals are delivered from the UCTS to the TIB continuously via an RJ45 interface, and the TIB controls when they should be delivered to the TCDS depending on the camera state. In addition, the UCTS timestamps the camera trigger signals delivered by the TIB, also with nanosecond accuracy [16,17]. Besides providing the camera triggers, the TIB assigns a bitmask encoding the actual trigger source (mono, stereo, calibration, pedestal, etc.…”

Section: The Tib In the Cameramentioning

confidence: 99%

A Trigger Interface Board for the Large and Medium Sized telescopes of the Cherenkov Telescope Array

Tejedor

Barrio

Peñil

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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Section: The Tib In the Cameramentioning

confidence: 99%

A Trigger Interface Board for the Large and Medium Sized telescopes of the Cherenkov Telescope Array

Tejedor

Barrio

Peñil

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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“…Although they can achieve up to picosecond-level resolutions on FPGA devices [33], they require complex calibrations, are affected by temperature changes, and require dedicated hardware or extensive logic resources. • Multi-clock: These designs generate several copies of the local clock with known phase delays to reach picosecond-level resolution [34]. They are typically combined with previously exposed methods.…”

Section: B Timestampingmentioning

confidence: 99%

Precise Network Time Monitoring: Picosecond-Level Packet Timestamping for Fintech Networks

2021

Self Cite

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Network visibility and monitoring are critical in modern networks due to the increased density, additional complexity, higher bandwidth, and lower latency requirements. Precise packet timestamping and synchronization are essential to temporally correlate captured information in different datacenter locations. This is key for visibility, event ordering and latency measurements in segments as telecom, power grids and electronic trading in finance, where order execution and reduced latency are critical for successful business outcomes. This contribution presents Precise Network Time Monitoring (PNTM), a novel mechanism for asynchronous Ethernet packet timestamping which adapts a Digital Dual Mixer Time Difference (DDMTD) implemented in an FPGA. Picosecond-precision packet timestamping is outlined for 1 Gigabit Ethernet. Furthermore, this approach is combined with the White Rabbit (WR) synchronization protocol, used as reference for the IEEE 1588-2019 High Accuracy Profile to provide unprecedented packet capturing correlation accuracy in distributed network scenarios thanks to its sub-nanosecond time transfer. The paper presents different application examples, describes the method of implementation, integration of WR with PNTM and subsequently describes experiments to demonstrate that PNTM is a suitable picosecond-level distributed packet timestamping solution.

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“…The GTC telescope (Gran Telescopio CANARIAS) also plans to apply time synchronization methods to its distributed subsystems to improve system performance (Gaggstatter et al 2016). The Cherenkov Telescope Array (CTA) improves the efficiency of acquiring high-energy gamma rays by synchronizing precise timestamps to distributed devices (Sanchez-Garrido et al 2021). In addition to this, the concept of time synchronization was introduced in telescopes for real-time tracking of satellites and satellite laser ranging in order to reduce the latency and at the same time reduce the problem of data loss (Seo et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

Li,

Ye,

Yang

et al. 2024

Res. Astron. Astrophys.

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A time-synchronization strategy for packetized transmission of target position about large-aperture telescope observation control system has been proposed in this study. Compared with the existing telescope tracking strategy, the target position packing and sending strategy based on the time synchronization method proposed in this paper has the advantages of high stability and reliability. Firstly, the telescope tracking observation control method was elaborated in this paper, including the motion pattern during telescope tracking. Then, the strategy for packetizes transmission of target positions based on time-synchronization is established and lists the detailed steps. Finally, the performance of the tracking strategy is verified using the 2.5m telescope for the simulated uniform speed star and the blind-tracking fixed star HIP31216, respectively. The test results show that the accuracy RMS of the tracking strategy proposed in this paper is less than 0.02" at 30 minutes, and the performance is much better than the design requirement of 0.3". The most important advantage of this tracking strategy is that the telescope can guarantee normal tracking for a certain period of time even if the hardware or software of the host computer is abnormal.

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A White Rabbit-Synchronized Accurate Time-Stamping Solution for the Small-Sized Cameras of the Cherenkov Telescope Array

Cited by 9 publications

References 22 publications

A Trigger Interface Board for the Large and Medium Sized telescopes of the Cherenkov Telescope Array

A Trigger Interface Board for the Large and Medium Sized telescopes of the Cherenkov Telescope Array

Precise Network Time Monitoring: Picosecond-Level Packet Timestamping for Fintech Networks

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

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