Multi-receiver GPS-based direct time estimation for PMUs

Sriramya Bhamidipati, Yuting Ng, Grace Xingxin Gao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Modern power distribution systems are incorporating Phasor Measurement Units (PMUs) to measure the instantaneous voltage and current phasors at different nodes in the power grid. These PMU devices depend on GPS for precise time and synchronization. However, GPS L1 C/A signals are vulnerable because of its low power and unencrypted signal structure. Therefore, there is a need for the development of robust time transfer techniques to ensure power grid stability. We propose a novel multi-receiver direct time estimation (MRDTE) algorithm by utilizing the measurements from multiple receivers triggered by a common clock. We first implement a novel signal processing technique known as the Direct Time Estimation (DTE) that directly correlates the received GPS signal with the corresponding signal replica for each of the pre-generated set of clock states. The most optimal set of clock candidates is then estimated based on the principle of maximum likelihood estimation. By leveraging upon the known geographical diversity of multiple receiver positions, we employ a overall Kalman Filter to obtain a robust corrected clock bias and clock drift at any instant. We demonstrate the increased resilience of our MRDTE algorithm against malicious timing attacks that include jamming and meaconing through outdoor field experiments.

Original languageEnglish (US)
Title of host publication29th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2016
PublisherInstitute of Navigation
Pages833-837
Number of pages5
ISBN (Electronic)9781510834101
DOIs
StatePublished - 2016
Event29th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2016 - Portland, United States
Duration: Sep 12 2016Sep 16 2016

Publication series

Name29th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2016
Volume2

Other

Other29th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2016
CountryUnited States
CityPortland
Period9/12/169/16/16

ASJC Scopus subject areas

  • Computer Science Applications
  • Software
  • Computer Networks and Communications
  • Communication
  • Information Systems
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Multi-receiver GPS-based direct time estimation for PMUs'. Together they form a unique fingerprint.

  • Cite this

    Bhamidipati, S., Ng, Y., & Gao, G. X. (2016). Multi-receiver GPS-based direct time estimation for PMUs. In 29th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2016 (pp. 833-837). (29th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2016; Vol. 2). Institute of Navigation. https://doi.org/10.33012/2016.14682