Precision Loran-C Navigation for the Harbor and Harbor Entrance Area,

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Abstract:

THE U. S. Coast Guard is engaged in a long-term program to evaluate the potential and develop the technology for precision navigation using Loran-C. The Coast Guard has taken a three-pronged approach to harbor and harbor entrance HHE navigation-user equipment development, time difference TD surveying, and grid stability analysis. These three aspects of HHE Loran-C navigation were addressed in separate papers presented in October, 1979. This report updates and consolidates the three papers, and is intended to serve as a source document on the Coast Guards approach to HHE Loran-C navigation. User equipment is being developed which combines time differences from a precision Loran-C receiver with survey information from a data tape cassette using simple algorithms to present the piloting situation on a CRT display. The algorithms, hardware, and software are described, and the results of summer and winter 1979 tests on the St. Marys River are given. It is concluded that accuracies of better than 25 meters are achievable. Three methods are described for surveying the Loran-C time difference coordinates of waypoints and prominent physical features of a harbor area for precision Loran-C navigation. Resutls are presented from field measurements on the St. Marys River Mini Loran-C Chain using existing visual aids to navigation as a position reference. The survey methods described provide for accurate and timely Loran-C grid survey over a wide range of harbor areas. The general features of each method and details of the visual aids to navigation approach are presented. Analysis of field measurements show survey capability on the order of ten nanoseconds.

Author(s):
Olsen, D. L. ; Ligon, J. M. ; Sedlock, A. J. ; Isgett, C. E.
Author Organization(s):
COAST GUARD WASHINGTON D C OFFICE OF RESEARCH AND DEVELOPMENT
Supplementary Note:
Updates and consolidates three papers presented at the Annual Technical Symposium of the Wild Goose Association (8th) on 17-19 Oct 79 at Williamsburg, VA.
Pagination:
0154

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
USCG-D-34-80
 Subject Terms
Joint Capability Areas:
JCA_3_Force Application; JCA_3.1.1_Maneuver to Engage; JCA_3.1_Maneuver; JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.1_Analyze Problem; JCA_1_Force Support; JCA_4_Logistics; JCA_1.2_Force Preparation; JCA_1.2.3_Educating; JCA_5.6.3_Assess Achievement of Objectives; JCA_5.6_Monitor; JCA_6_Net Centric; JCA_6.4.1_Secure Information Exchange; JCA_1.3_Human Capital Management; JCA_6.1.1_Wired Transmission; JCA_1.3.2_Personnel Management; JCA_6.1.3_Switching and Routing; JCA_6.1_Information Transport; JCA_6.4_Information Assurance; JCA_1.2.5_Lessons Learned
Modernization Areas:
Space; Quantum Science and Computing; Microelectronics
Communities of Interest:
Ground and Sea Platforms
Descriptor(s):
*ELECTROMAGNETIC WAVE PROPAGATION, *HARBORS, *LORAN, *NAVIGATION CHARTS, ALGORITHMS, SURVEYS, DELAY, RIVERS
Field(s)/Group(s):
Radiofrequency Wave Propagation
Keyword(s):
Harbor navigation, Precision navigation, Time difference surveying, Inertial surveying, Microwave surveying, CCZ(Coastal Confluence Zone), Saint Marys River, Miniloran chains
Report Date:
1980 May 01