Common-View LORAN-C as a Backup to GPS for Precise Time Recovery

Abstract

The LORAN-C network is being recapitalized to serve as a backup to GPS for navigation and timing. LORAN-C is being investigated as a precision (sub 100 ns) time recovery system for use in the continental United States. Traditionally, LORAN-C time recovery has been limited by propagation effects (both spatial and temporal) to provide time recovery in the microsecond range. By employing common-view techniques long used in GPS, the potential exists to enhance time recovery performance by over an order of magnitude using LORAN-C. The LORAN-C Accuracy Panel (run by the US Coast Guard) has sponsored a research project to collect data and determine the performance level for time recovery using common-view LORAN-C. This paper presents the results of that work. This paper begins with a short overview of the LORAN-C recapitalization project, with an emphasis on timing enhancements at the transmitting stations. A description of the commonview LORAN-C test network follows. Data collected in Boulder will be corrected via commonview using a near field station and a far field station. Results will be analyzed to determine the dependence of time recovery precision on distance.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2004
Accession Number
ADA427851

Entities

People

  • Casey Biggs
  • Michael Lombardi
  • Tom Celano

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Calibration
  • Clocks
  • Coast Guard
  • Corporations
  • Data Sets
  • Frequency
  • Intervals
  • Loran
  • Measurement
  • Recovery
  • Standards
  • Time Interval Counters
  • Time Intervals
  • Transmitters
  • United States

Readers

  • Energy Conservation and Renewable Energy Engineering.
  • Maritime Security/Maritime Homeland Security
  • Space/Atmospheric Physics.

Technology Areas

  • Space