QUANTIFYING EXCITATION OF GROUND WAVES BY BURIED AND NEAR-EARTH ANTENNAS

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$49,911.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
9198
Agency Tracking Number:
9198
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
1625 Stierlin Rd, Mountain View, CA, 94043
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DR ROBERT L TANNER
(415) 962-5200
Business Contact:
() -
Research Institute:
n/a
Abstract
AN IMPORTANT FUNCTION OF SURVIVABLE C(3) SYSTEMS IS GROUND WAVE COMMUNICATION FOLLOWING A NUCLEAR EVENT. ANTENNAS MOST LIKELY TO SURVIVE SUCH EVENTS ARE BURIED OR LOW PROFILE NEAR-THE-EARTH ANTENNAS. HOWEVER, THE GROUND WAVE FIELD STRENGTH FOR SUCH ANTENNAS IS NOT EASILY CALCULATED. USUALLY, SUCH CALCULATIONS ARE BASED ON COMPARING THE ANTENNA IN QUESTION TO A "STANDARD" ELECTRICALLY SHORT VERTICAL MONOPOLE. FIELD STRENGTH CURVES ARE READILY AVAILABLE FOR THE "STANDARD" ANTENNA FROM SUCH SOURCES AS THE CCIR RECOMMENDATION 368-4. SUCH GAIN DETERMINATIONS AT ZERO DEGREES ELEVATION ANGLE, HOWEVER, ASSUME PERFECTLY CONDUCTING EARTH. THIS METHOD CANNOT BE APPLIED TO BURIED ANTENNAS SINCE THEY WOULD NOT RADIATE IN A PREFECTLY CONDUCTING EARTH. THEIR ABILITY TO RADIATE DEPENDS UPON THE EARTH'S FINITE CONDUCTIVITY AND PERMITTIVITY. THEREFORE, OTHER METHODS OF CALCULATION MUST BE USED. TCI PROPOSES TO UTILIZE ITS ANALYTICAL EXPERTISE TO ACCURATELY ANALYZE BURIED OR NEAR-EARTH HF ANTENNAS AND DEVELOP SPACE WAVE GAIN, EFFICIENCY AND GROUND WAVE STRENGTH OF THESE BURIED OR NEAR-EARTH ANTENNAS. A GOAL OF THE EFFORT WILL BE TO ESTABLISH A RELATIONSHIP BETWEEN THE GROUND WAVE LAUNCHING EFFICIENCY OF BURIED AND NEAR-EARTH ANTENNAS AND THE MORE CONVENTIONAL VERTICAL MONOPOLES, WHICH WILL PERMIT THE USE OF AVAILABLE GROUND WAVE PROPAGATION CURVES AND CALCULATION TECHNIQUES TO PREDICT THE PERFORMANCE OF C(3) APPLICATIONS OF BURIED AND NEAR-EARTH ANTENNAS.

* information listed above is at the time of submission.

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