Method and apparatus for establishing low frequency/ultra low frequency and very low frequency communications
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorKonstantinos PAPADOPOULOS
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Abstract
A method for generating electromagnetic waves in the ELF/ULF comprising the steps of using a ground-based Horizontal Electric Dipole (HED) antenna to send electromagnetic pulses upwardly in the E-region of the ionosphere to form an oscillatory or pulsed electric field; allowing said pulsed electric field to interact with magnetized plasma of the lower ionosphere to generate a pulsed horizontal and vertical current which have associated Horizontal and Vertical Electric Dipole moment; and allowing them to radiate.
Claims18
A method for generating electromagnetic waves in the ELF/ULF comprising the step of:
- using a ground-based horizontal electric dipole antenna to send electromagnetic pulses upwardly in the E-region of the ionosphere to form an oscillatory or pulsed electric field, the oscillatory or pulsed electric field interacting with magnetized plasma of the lower ionosphere to generate oscillatory or pulsed horizontal and vertical currents which have an associated electric dipole moment, the oscillatory or pulsed horizontal and vertical currents radiating in the earth-ionosphere waveguide.
Apparatus for communicating from a ground-based transmitter at extra low frequencies to a receiver, comprising;
- a ground-based transmitter having an antenna located near the magnetic dipole of the earth, said transmitter transmitting extremely low frequency signals to said receiver, whereby the signal strength at said receiver is stronger than that associated with signals from an identical ground-based transmitter at upper latitudes.
Apparatus for reliable extra low frequency communication with submarines that does not require the existence of an electrojet in the ionosphere, comprising:
- a ground-based transmitter for transmitting extra low frequency signals from a location near the magnetic equator, whereby signals received at a receiver at said submarine are robustly detected regardless of the non-existence of said electrojet.
Dependencies are inferred from the claim text.