Precision Time Protocol

About: Precision Time Protocol is a research topic. Over the lifetime, 604 publications have been published within this topic receiving 6006 citations. The topic is also known as: PTP & IEEE 1588.

Unbiased Predictive Steering of Local Clocks Utilizing GPS 1PPS Time Signals

Abstract: This work addresses an optimal Global Positioning System (GPS)-based synchronization loop for local clocks utilizing the one pulse per second (1PPS) timing signals. To eliminate sawtooth errors peculiar to the 1PPS signals and optimally steer the clock errors each M seconds, we propose using a ramp predictive finite impulse response (FIR) filter that is known to be optimal for clock models on large averaging horizons. A low-pass filter is used to smooth the hold filter output between the optimally predicted points. A GPS locked crystal clock has been investigated in detail in terms of the time interval error and precision time protocol (PTP) variance. A high efficiency implementation of the proposed synchronization algorithm is demonstrated experimentally.

A Hybrid Wired/Wireless Deterministic Network for Smart Grid

Abstract: With the rapid growth of time-critical applications in smart grid, robotics, autonomous vehicles, and industrial automation, demand for high reliability, low latency and strictly bounded jitter is sharply increasing. High-precision time synchronization communications, such as Time Triggered Ethernet (TTE), have been successfully developed for wired networks. However, the high cost of deploying additional equipment and extra wiring limits the scalability of these networks. Therefore, in this paper, a hybrid wired/wireless high-precision time synchronization network based on a combination of high-speed TTE and 5G Ultra-Reliable and Low-Latency Communications (URLLC) is proposed. The main motivation is to comply with the low latency, low jitter, and high reliability requirements of time critical applications, such as smart grid synchrophasor communications. Therefore, in the proposed hybrid network architecture, a high-speed TTE is considered as the main bus (i.e., backbone network), whereas a Precision Time Protocol (PTP) aided 5G-URLLC-based wireless access is used as a sub-network. The main challenge is to achieve interoperability between the PTP aided URLLC and the TTE, while ensuring high precision timing and synchronization. The simulation results demonstrate the impact of the PTP-aided URLLC in maintaining network reliability, latency, and jitter in full coordination with the TTE-network.

Network-based multi-channel signal processing using the precision time protocol

Abstract: A conventional microphone array system uses a conductor to wire from a microphone to an input via an amplifier While, a wireless transmission for an array system makes the configuration flexible, and it is expected to provide novel applications widely, such as measuring of impulse response in wide area Not only in acoustic research field but also in research area of remote sensing of body motion and so on, data acquisition with a precise time synchronization is essential When a signal received at distributed microphone's position is sent over a computer network, the data is packetized and can include some information at receiving point When a time is included as information at data acquisition position, the time depends on each data acquisition client device Since it is possible to use network time protocol or precision time protocol, multi-channel signal processing can be achieved with ease This paper proposes multiple signals transmission system over a computer network with a time code embedding to synchronize those signals The signal from a client is reconstructed at a server with the time code Since the time differences between clients affects to performance of the multichannel signal processing, smaller error in time at a client is preferred This paper discusses how the error in time between channels affects to performance of the distributed microphone array system

Method and system for merging clocks from multiple precision time protocol (ptp) clock domains

Abstract: Embodiments of a method and device are disclosed. In an embodiment, a method for synchronizing a slave clock in a Time Sensitive Network (TSN) that includes multiple Precision Time Protocol (PTP) clock domains is disclosed. The method involves determining parameters related to multiple PTP clock domains, assigning domain-specific weights to the multiple PTP clock domains based on the determined parameters, generating a control signal for a clock parameter using the domain-specific weights assigned to the multiple PTP clock domains, and adjusting the clock parameter of a slave clock in response to the control signal.

Study and implementation of Precision Time Protocol with C

Abstract: It is an important field of research to achieve precise time synchronization with precision time protocol in network. This paper mainly studies the kernel mechanism of synchronizing the clock between the host and slave devices with PTP, on which base the system is designed and realized through software simulation with the programming tool C#. The precision of synchronization reaches one millisecond. And simulation results show the validity of the proposed controller design method.