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Precise disciplining of a chip-scale atomic clock using PPP with broadcast ephemerides

Kunzi, Florian and Montenbruck, Oliver (2023) Precise disciplining of a chip-scale atomic clock using PPP with broadcast ephemerides. GPS Solutions, 27, p. 165. Springer. doi: 10.1007/s10291-023-01496-4. ISSN 1080-5370.

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Official URL: https://link.springer.com/article/10.1007/s10291-023-01496-4


Over the last decade, chip-scale atomic clocks (CSACs) have emerged as stable time and frequency references with small size, weight, and power (SWaP). While the short-term stability of these devices clearly outperforms other oscillators with similar power consumption, their stability over longer time intervals is notably limited by frequency noise. Such long-term deviations can effectively be compensated by disciplining the clock with respect to a stable time and frequency reference such as Coordinated Universal Time (UTC) or a time scale based on GNSS observations. In view of the limited accuracy of GPS pseudorange observations and broadcast ephemerides, the performance of GNSS-disciplined atomic clocks is commonly limited to the few-nanosecond level. For further improvement, this study combines the use of carrier phase-based precise-point-positioning (PPP) techniques and high-performance broadcast ephemerides to discipline the phase of a CSAC with respect to GNSS broadcast time. Making use of a dual-frequency, dual-constellation GPS/Galileo receiver, a sub-nanosecond time interval error with respect to a national UTC timing laboratory is demonstrated over time intervals from 1 s to several days.

Item URL in elib:https://elib.dlr.de/195896/
Document Type:Article
Title:Precise disciplining of a chip-scale atomic clock using PPP with broadcast ephemerides
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kunzi, FlorianUNSPECIFIEDhttps://orcid.org/0000-0002-4711-8132UNSPECIFIED
Montenbruck, OliverUNSPECIFIEDhttps://orcid.org/0000-0003-4783-745XUNSPECIFIED
Date:July 2023
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 165
Keywords:Time synchronization, Frequency control, Clock steering, CSAC, Precise point positioning, GNSS-disciplined oscillator
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Infrastructure, Flight Dynamics, GPS
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Space Flight Technology
Deposited By: Kunzi, Florian
Deposited On:12 Jul 2023 09:04
Last Modified:12 Jul 2023 09:04

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