Propagation of the Low Frequency Groundwave over Nonuniform Terrain.

reportActive / Technical Report | Accession Number: ADA057273 | Open PDF

Abstract:

This report examines the utility and limitations of the integral-equation representation of ground-wave propagation over nonuniform terrain. Emphasis is on frequencies between 20 kHz and 200 kHz. The one-dimensional version of the integral groundwave equation is subject to errors caused by topographic irregularities near the great-circle propagation path finite ground conductivity nonuniformities in the earths electrical properties and an approximate integration to reduce the dimension of the equation from two to one. Each of these errors is quantified, and the types of terrain to which the integral ground-wave equation is applicable are defined. A method of numerical solution is developed and used to obtain results for the special case of a smooth, uniform, spherical earth. These results are compared in detail with numerical results obtained from the widely used residue-series representation of ground-wave propagation. The agreement between the two methods is shown to be excellent. Graphical results are given for the ground-wave attenuation function. Author

Author(s):
Field, E. C. ; Allen, R.
Author Organization(s):
PACIFIC-SIERRA RESEARCH CORP SANTA MONICA CALIF
Descriptive Note:
Final rept. 15 Mar-30 Sep 77,
Supplementary Note:
DOI: 10.21236/ADA057273
Pagination:
0060

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PSR-717, RADC-TR-78-68
Contract/Grant Number(s):
F19628-77-C-0120
Task Number(s):
J3
Project Number(s):
2304
Monitor Series:
TR-78-68
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1.4.2_Health Service Delivery; JCA_1.4_Force Support; JCA_5.1.1_Establish and Maintain Unity of Effort with Mission Partners; JCA_5.1_Organize; JCA_5.3_Planning; JCA_1.2.5_Lessons Learned; JCA_6.1.2_Wireless Transmission; JCA_6.1_Information Transport; JCA_6_Net Centric
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*ELECTROMAGNETIC WAVE PROPAGATION, *GROUND WAVES(ELECTROMAGNETIC), ELECTRICAL CONDUCTIVITY, VARIATIONS, RADIATION ATTENUATION, APPROXIMATION(MATHEMATICS), ERROR ANALYSIS, NUMERICAL METHODS AND PROCEDURES, LOW FREQUENCY, LORAN
Field(s)/Group(s):
Radiofrequency Wave Propagation
Keyword(s):
PE61102F, WURADC2304J320
Report Date:
1978 Mar 01