Wireless communication inside shielded envelope
First Claim
1. A method for attenuating electromagnetic (EM) signals passing through a body of a mobile platform, comprising:
- shielding the body of the mobile platform to provide a first degree of reduction in a signal-to-noise ratio of an EM signal radiating into an interior cabin area of said mobile platform from outside of said mobile platform; and
generating a noise signal within an interior cabin area of the mobile platform, and within a predetermined frequency band, to raise an EM noise floor in said interior cabin area of said mobile platform to provide a second degree of reduction in the signal-to-noise ratio of said EM signal radiating into said interior cabin area.
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Accused Products
Abstract
A system and method for preventing use of cellular/PDA devices on-board a mobile platform, such as an aircraft. The system involves using the shielding of the fuselage of the aircraft to provide a first degree of signal-to-noise ratio attenuation of signals from terrestrial wireless access points entering into the interior cabin area of the aircraft. A noise floor lifter subsystem raises the noise floor level within the aircraft to provide a second degree of attenuation of the signal-to-noise ratio of the signal entering the aircraft. By using the shielding of the fuselage, communication of the cellular/PDA devices can be prevented with a lesser degree of noise floor lifting within the aircraft, thus reducing the chance of interference with terrestrial wireless access points and/or interference with important navigation or avionics subsystems within the aircraft.
43 Citations
16 Claims
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1. A method for attenuating electromagnetic (EM) signals passing through a body of a mobile platform, comprising:
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shielding the body of the mobile platform to provide a first degree of reduction in a signal-to-noise ratio of an EM signal radiating into an interior cabin area of said mobile platform from outside of said mobile platform; and
generating a noise signal within an interior cabin area of the mobile platform, and within a predetermined frequency band, to raise an EM noise floor in said interior cabin area of said mobile platform to provide a second degree of reduction in the signal-to-noise ratio of said EM signal radiating into said interior cabin area. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for reducing electromagnetic (EM) signals passing through a body of a mobile platform, comprising:
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shielding the body of the mobile platform to provide a first degree of reduction of a signal-to-noise ratio of EM signals radiating into an interior cabin area of said mobile platform from outside of said mobile platform; and
generating a white noise signal within an interior cabin area of the mobile platform, and within a frequency band used by a user operated wireless device, to raise an EM noise floor in said interior cabin area of said mobile platform to provide a second degree of reduction in the signal-to-noise ratio of said EM signal radiating into said interior cabin area;
said first and second degrees of reduction of said signal-to-noise ratio cooperatively being sufficient to prevent use of said user operated wireless device within said interior cabin area. - View Dependent Claims (9, 10, 11, 12)
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13. A system for attenuating electromagnetic (EM) wave signals passing through a body of a mobile platform, comprising:
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shielding material covering at least a substantial portion of the body of the mobile platform to provide a first degree of reduction in a signal-to-noise ratio of an EM signal radiating into an interior cabin area of said mobile platform from a wireless access point located outside of said mobile platform; and
a noise signal generator disposed within an interior cabin area of the mobile platform, for generating a noise signal within a frequency band used by a user operated wireless device, to raise an EM noise floor in said interior cabin area of said mobile platform to provide a second degree of reduction in the signal-to-noise ratio of said EM signal radiating into said interior cabin area, said first and second degrees of reduction of said signal-to-noise ratio cooperatively preventing use of said user operated wireless device within said interior cabin area. - View Dependent Claims (14, 15, 16)
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Specification