Communications: directive radio wave systems and devices (e.g. – Directive – Including directive communication system
Patent
1990-08-17
1991-10-01
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including directive communication system
342372, H04B 700, H01Q 322
Patent
active
050537830
ABSTRACT:
A method and apparatus for causing interruptions in the ionospheric electrojet to produce ULF/ELF/VLF signals enhances low frequency communications capabilities. A high power transmitter heats ionospheric electrons to enhance the electron-neutron collision rate with an antenna beam that can be modulated in the ELF and VLF frequency ranges. In order to increase efficiency of HF to ELF power conversion by more than two orders of magnitude, a heater is swept over a 35 degree cone on timescales faster than the plasma cooling rate at the heating altitude. Thus, the antenna beam is swept over an area of earth atmosphere to cause heating of ionospheric electrons in regions proximate to each other. The antenna is swept at a rate faster than the cooling rate of the atmosphere and is used to heat regions at an altitude of about 90 km. In addition, an electric field generated by the antenna beam is monitored and the heating region is shaped to optimize a vertical component of the electric field.
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