Connection Inhibition Apparatus and Method
AssigneeAeromobile, Ltd.
InventorsZoran Dobrosavljevic, Anthony Peter Hulbert
Life of this patent
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Abstract
The apparatus transmits in a first zone, for example, an aircraft, a masking signal which masks transmissions from a second zone outside of the first. By doing this a mobile cellular telephone is inhibited from connecting or attempting to connect to base-stations on the ground. A hole in the masking signal spectrum may be provided to enable connection to a base-station within the aircraft. Alternatively, a base-station within the aircraft may be arranged to transmit at a power level greater than the masking signal.
Claims53
Connection inhibition apparatus to prevent mobile communication equipment in a first zone connecting to a base-station in a second zone outside the first zone, the apparatus comprising:
- means to transmit a masking signal at a frequency or frequencies of the base-station within the first zone to mask transmissions from the second zone to inhibit connection thereto wherein the masking signal is at least one chirped waveform.
A method of inhibiting connection of mobile communication equipment in a first zone to a base-station in a second zone outside the first zone, comprising:
- transmitting a masking signal within the first zone at a frequency or frequencies of the base-station to mask transmissions emanating therefrom to inhibit connection thereto wherein the masking signal is a chirped waveform.
Connection inhibition apparatus to prevent mobile communication equipment in a first zone connecting to a base-station in a second zone outside the first zone, the apparatus comprising:
- means to transmit a masking signal within the first zone to mask transmissions from the second zone wherein the masking signal comprises a spectrum having a hole at a frequency at which a base-station in the first zone operates such that connection to base-stations in the second zone are inhibited and that connection to a base-station in the first zone are permitted.
Connection inhibition apparatus to prevent mobile communication equipment in a first zone connecting to a base-station in a second zone outside the first zone, the apparatus comprising:
- means to transmit a masking signal at the frequency or frequencies of the base-station within the first zone to mask transmissions from the second zone to inhibit connection thereto wherein the masking signal comprises two or more mutually non-coherent signals mutually non-coherent in order to prevent fading in the first zone.
A coupling network for coupling a first and a second masking signal from a first masking signal source, a third masking signal from a second masking signal source which signal being diverse relative to the first masking signal and a transmitter signal to a first and a second antenna, comprising:
- means to couple the first and the third masking signals to respective ones of the first and the second antenna;
- means to combine the transmitter signal and the second masking signal to provide a first combined signal;
- and
- means to couple the combined signal to both antennas.
A method for producing a notched chirped waveform for use as a masking signal comprising the steps of:
- providing a chirped waveform;
- identifying a part of the chirped waveform where a notch is required;
- applying a transform to the identified part to provide spectral components;
- deriving from the spectral components those that are to be nulled;
- applying an inverse transform to the spectral components to be nulled;
- and
- subtracting the inverse transformed spectral components from the chirped waveform to generate the notched chirped waveform.
Dependencies are inferred from the claim text.