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Comparison between simulation and hardware realization for different clock steering techniques

Gödel, Marion and Schmidt, Tobias Daniel and Furthner, Johann (2019) Comparison between simulation and hardware realization for different clock steering techniques. Metrologia. Institute of Physics (IOP) Publishing. DOI: 10.1088/1681-7575/ab144d ISSN 0026-1394

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Official URL: https://doi.org/10.1088/1681-7575/ab144d

Abstract

Clock steering is an important discipline within the time and frequency community as well as in cognate disciplines such as global navigation satellite systems. In the latter, clock steering is a mandatory tool for realizations of time scales, which first are typically created by algorithms forming a paper clock. Often, this software solution of a time scale is already sufficient. However, sometimes a realization in form of a frequency signal is feasible or even necessary. Future global navigation satellite systems concepts plan to use composite clocks consisting of several different clocks to achieve synchronization of satellites within one orbit with the system time. In this approach, a real clock output in the microwave regime is indispensable. Therefore, a real clock has to be steered against the paper clock to realize the composite clock. Consequently, steering techniques are an essential piece for obtaining a realization. Besides the number of algorithms to choose from, there are several parameters that need to be defined by the user to achieve the best performance for distinct scenarios. In this paper we compare the realization performance and applicability of two different steering techniques, namely linear-quadratic Gaussian control and pole placement, in a simplified hardware setup. The studied scenario consists of a steerable clock consisting of a micro phase stepper which changes the frequency of the output of an oven-controlled quartz oscillator (OCXO) and a rubidium atomic clock (RB). The OCXO in turn is steered to follow the free-running RB as closely as possible. Steering the output of the OCXO introduces a new process in the clock. As a result, the Allan deviation of the steered clock shows a bump which location is dependent on the chosen control interval and steering technique. This has to be considered for the designated operation. We compare simulations of the clock steering with both techniques to real-data results from our laboratory.

Item URL in elib:https://elib.dlr.de/127013/
Document Type:Article
Title:Comparison between simulation and hardware realization for different clock steering techniques
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gödel, MarionUNSPECIFIEDUNSPECIFIED
Schmidt, Tobias DanielTobias.Schmidt (at) dlr.deUNSPECIFIED
Furthner, JohannJohann.Furthner (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Metrologia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1088/1681-7575/ab144d
Publisher:Institute of Physics (IOP) Publishing
ISSN:0026-1394
Status:Accepted
Keywords:Clock steering, Kalman filter
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben GNSS2/Neue Dienste und Produkte
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Schmidt, Tobias
Deposited On:01 Apr 2019 16:02
Last Modified:06 Sep 2019 15:20

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