hnical Report, 2020. http://handle.itu.int/11.1002/pub/815052de-en "Q13/15 - Network synchronization and time distribution performance." ITU-T Study Groups, Study Period 2017-2020.https://www.itu.int/en/ITU-T/studygroups/2017-2020/15/Pages/q13.aspx Internet Engineering Task Force (IETF) Bjorklund, M. "The YANG 1.1 Data Modeling Language." IETF, RFC 7950, 2016. https://tools.ietf.org/html/rfc7950 Bjorklund, M. "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)." IETF, RFC 6020, 2010. https://tools.ietf.org/html/rfc6020 Enns, R. "NETCONF Configuration Protocol." IETF, RFC 4741, 2006. https://tools.ietf.org/html/rfc4741 Enns, R. "Network Configuration Protocol (NETCONF)." IETF, RFC 6241, 2011. https://tools.ietf.org/html/rfc6241 Jiang, Y., X. Liu, J. Xu, and R. Cummings. "YANG Data Model for the Precision Time Protocol (PTP)." IETF, RFC 8575, 2019. https://tools.ietf.org/html/rfc8575 Shankarkumar, V., L. Montini, T. Frost, and G. Dowd. "Precision Time Protocol Version 2 (PTPv2) Manage- ment Information Base." IETF, RFC 8173, 2017. https://tools.ietf.org/html/rfc8173 Navstar GPS Directorate. "NAVSTAR GPS Space Segment/Navigation User Segment Interfaces." GPS In- terface Specification, Revision L, 2020. https://www.gps.gov/technical/icwg/IS-GPS-200L.pdf Further Reading Chapter 1 European GNSS Service Centre (for the Galileo GNSS system): https://www.gsc-europa.eu/ GPS: The Global Positioning System: https://www.gps.gov/systems/ International System of Units (SI): https://www.bipm.org/en/measurement-units/ National Institute of Standards and Technology (NIST) Time and Frequency Division: https://www.nist.gov/pml/time-and-frequency-division/ Resilient Navigation and Timing Foundation: https://rntfnd.org/ U.S. Coast Guard Navigation Center GPS Constellation: https://www.navcen.uscg.gov/?Do=constellationStatus Chapter 3 GPS: The Global Positioning System: https://www.gps.gov/systems/ U.S. Coast Guard Navigation Center Constellation: https://www.navcen.uscg.gov/?Do=constellationStatu European