Aircraft internal EMI detection and location
First Claim
1. A system comprising a first antenna located near the front of an aircraft cabin connected to an amplifier connected to a timing circuit, a second antenna located near the rear of an aircraft cabin connected to an amplifier connected to the first said timing circuit such that the difference in the arrival times between the two signals at antenna and the second antenna are used to determine the location of a electromagnetic interference producer between the two antennas.
1 Assignment
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Accused Products
Abstract
A circuit and method to locate a cellular phone or noisy laptop computer in an aircraft uses and antenna each in the front and back of the plane. Arrival time differences of cellular phone pulses are used to locate the offending phone. Three receivers are used to locate a cell phone in a theater audience. Broad band correlation is used to locate an offending laptop computer.
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Citations
12 Claims
- 1. A system comprising a first antenna located near the front of an aircraft cabin connected to an amplifier connected to a timing circuit, a second antenna located near the rear of an aircraft cabin connected to an amplifier connected to the first said timing circuit such that the difference in the arrival times between the two signals at antenna and the second antenna are used to determine the location of a electromagnetic interference producer between the two antennas.
- 7. A method of deriving the location, in an aircraft, of an electromagnetic interference producer comprising the steps of installing two antennas, detecting the output of each of the two antennas, measuring the time difference between the outputs, calculating a actual linear dimensional difference corresponding to the time difference based on the speed of light, subtracting the cable length difference between the two antennas, and calculating a location of the electromagnetic interference producer between the two antennas.
Specification