The WAAS/L5 signal for robust time transfer: Adaptive beamsteering antennas for satellite time synchronization

David S. De Lorenzo, Sherman C. Lo, Jiwon Seo, Yu Hsuan Chen, Per K. Enge

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

20 Citations (Scopus)

Abstract

Geostationary satellites of the Wide Area Augmentation System (WAAS) offer a novel, robust, and cost-effective means of synchronizing time at widely-separated ground facilities, to levels of ∼50ns, without the need for dedicated long-distance wired communication networks. However, reliance on satellite-based signals for time synchronization in high-reliability applications is problematic without explicit hardening against radio frequency interference (RFI). The primary innovations to be discussed in this paper are: (1) adaptive electronically-steered multi-element antenna arrays and signal processing strategies for RFI mitigation, (2) live signal, synthetic interference, and hardware-in-the-loop testing of jammer cancellation algorithms, and (3) preparations for over-the-air interference tests which will probe the effects of front-end saturation on digital beamsteering performance. We describe a hardware system assembled from readily-available commercial building blocks (data acquisition system, antennas, etc.), and a critical goal of this research is to realize significant GPS anti-jam performance in an open-architecture (or non-defense-related) platform. Therefore, the central innovations in this research enable adaptive electronic beamsteering with high-dynamic-range signals (14-bit 1/Q digitization), employing commercial off-the-shelf (COTS) hardware and computer systems, and targeted for a civilian high-reliability, high-volume (many hundreds of deployed systems) GPS timing application.

Original languageEnglish
Title of host publication23rd International Technical Meeting of the Satellite Division of the Institute of Navigation 2010, ION GNSS 2010
Pages2106-2116
Number of pages11
Publication statusPublished - 2010 Dec 1
Event23rd International Technical Meeting of the Satellite Division of the Institute of Navigation 2010, ION GNSS 2010 - Portland, OR, United States
Duration: 2010 Sep 212010 Sep 24

Publication series

Name23rd International Technical Meeting of the Satellite Division of the Institute of Navigation 2010, ION GNSS 2010
Volume3

Other

Other23rd International Technical Meeting of the Satellite Division of the Institute of Navigation 2010, ION GNSS 2010
CountryUnited States
CityPortland, OR
Period10/9/2110/9/24

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All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Communication

Cite this

De Lorenzo, D. S., Lo, S. C., Seo, J., Chen, Y. H., & Enge, P. K. (2010). The WAAS/L5 signal for robust time transfer: Adaptive beamsteering antennas for satellite time synchronization. In 23rd International Technical Meeting of the Satellite Division of the Institute of Navigation 2010, ION GNSS 2010 (pp. 2106-2116). (23rd International Technical Meeting of the Satellite Division of the Institute of Navigation 2010, ION GNSS 2010; Vol. 3).