LORAN-C Harbor and Harbor Entrance Survey: Charleston, South Carolina.
Abstract
LORAN-C is being investigated as a possible aid to navigation in Harbor and Harbor Entrance areas, as outlined in the 1982 Federal Radionavigation Plan. LORAN-C can be used in the repeatable mode for excellent repeatable accuracies using waypoints whose LORAN-C time difference (TD) values have been previously measured. The exact accuracy achievable in a given harbor area depends on many factors and is best determined by measurement. If the true geodetic position is measured with an independent reference positioning system in addition to measuring the LORAN-C TDs, one can use the resulting TDs in the repeatable mode to achieve geodetic accuracies better than + or - 80 meters in many areas. Responding to a U.S. Navy request, we measured LORAN-C TDs simultaneously with Miniranger III, Raydist, and GPS positions along two routes in the Charleston, SC area. The results show that LORAN-C can provide + or - 29 meters geodetic accuracy along the Charleston river route and the ocean route to 20 miles offshore when using surveyed waypoints in the repeatable mode. The accuracy achieved beyond 20 miles was + or - 36 meters due to using a less accurate reference positioning system for surveying that area.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1985
- Accession Number
- ADA154875
Entities
People
- R. L. Gazlay