STUDY OF ENVIRONMENTAL CONSTRAINTS IN THE COASTAL HARBOR RADIOTELEPHONE SYSTEM
Effects of nonstationary noise and signal propagation characteristics on communications within the Coastal Harbor Radiotelephone System are discussed. This system provides ship-to-shore and ship-to-ship radiotelephone service for the vessels operating within the coastal waters of the United States. Service is furnished on radio frequencies between 2 and 3 MHz with expected over-water coverage distances from about 30 to 300 miles. Before January 1, 1977, ship-to-shore transmissions were either double-sideband AM (A3) or single-sideband reduced-carrier (A3A). Transmission from shore-to-ship was single-sideband full-carrier (A3H) for detection by conventional AM receivers or single-sideband reduced-carrier (A3A) for detection by single-sideband receivers. After Jan 1, 1977, conversion to only single-sideband transmission has taken place. It is shown that daytime communications in the Coastal Harbor System is effectively limited to a distance of 400 miles. As a result of the nonstationary noise environment, the nighttime usable range is essentially limited to 200 miles.
- IEEE Vehicular Technological Group Annual Conference, 27th, Orlando, Florida, March 16-18 1977.
Institute of Electrical and Electronics Engineers (IEEE)3 Park Avenue, 17th Floor
New York, NY United States 10016-5997
- Halpern, S W
- Publication Date: 1977
- Pagination: p. 237-238
- TRT Terms: Coasts; Communication systems; Noise; Ports; Radio; Radio signals; Radio stations; Radio telephone; Radio wave propagation; Transmission
- Old TRIS Terms: Coastal harbor radiotelephone; Coastal radio stations; Propagation effects; Radio transmission; Single sideband communications; Single-sideband transmission
- Subject Areas: Environment; Marine Transportation; Operations and Traffic Management;
- Accession Number: 00158446
- Record Type: Publication
- Source Agency: Engineering Index
- Report/Paper Numbers: Conf. Rec.
- Files: TRIS
- Created Date: Aug 31 1977 12:00AM