Accession Number:

ADP006878

Title:

The Utility of High Frequency Ground Wave in a Distributed Communication System,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1991-06-01

Pagination or Media Count:

6.0

Abstract:

The Johns Hopkins University Applied Physics Laboratory JHUAPL has investigated high frequency ground wave HFGW communication in mountainous terrain. Using a broadband, discone antenna and 100 watts of power, communication links in the 20 to 30 MHz band of at least 50 and, in some cases, as much as 115 km have been established over mountainous paths. Links were non-line-of-sight, and immune to ionospheric fading. Digital and wide-band frequency hopping communications have been demonstrated using HFGW. The discone antenna is about 3.5 m high when assembled and can be made extremely portable. The special characteristics of the 20 to 30 MHz band coupled with the properties of the discone antenna would offer advantages to distributed communication systems in mountainous terrain. This paper presents HFGW results and discusses how this medium may be exploited in a distributed system which uses both frequency and spatial distribution. Key Words Sky Wave Hop, Meteor Trail Reflection, and Ground Waves...

Subject Categories:

  • Radio Countermeasures
  • Electrical and Electronic Equipment
  • Radio Communications
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE