Method and apparatus for reporting a missile threat to a commercial aircraft
First Claim
1. A method for reporting a missile threat to a commercial aircraft, comprising the steps of:
- providing the commercial aircraft with a missile warning system in which the warning system operates at a classified level and has internal buses which in part carry classified information from one module to another within the missile warning system;
from the output of the missile warning system generating and transmitting an emergency notification signal to the ground reporting a missile threat; and
,preventing the classified information contained within the missile warning system from appearing on the transmission of the emergency notification signal.
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Accused Products
Abstract
An automatic system is provided for alerting ground personnel as to the existence of a threat to commercial aircraft in which the threat is determined by a classified system, but in which the local area network employed by the military missile warning is isolated from an unclassified local network coupled to the aircraft'"'"'s transponder which transmits the threat existence and status to ground personnel. The barrier to transmitting classified information involves both filtering between the classified LAN and unclassified LAN, the use of only discrete signaling lines in the classified LAN isolated by opto-electronics to provide physical separation between the two local area networks, and communications formatting which precludes the transmission of classified information across the barrier between the classified local area network and the unclassified local area network.
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Citations
20 Claims
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1. A method for reporting a missile threat to a commercial aircraft, comprising the steps of:
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providing the commercial aircraft with a missile warning system in which the warning system operates at a classified level and has internal buses which in part carry classified information from one module to another within the missile warning system; from the output of the missile warning system generating and transmitting an emergency notification signal to the ground reporting a missile threat; and
,preventing the classified information contained within the missile warning system from appearing on the transmission of the emergency notification signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for reporting a missile threat to a commercial aircraft, comprising:
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a missile warning system having modules interconnected with a classified local area network; an emergency notification warning system utilizing the aircraft'"'"'s transponder system for transmitting an emergency notification signal to the ground indicating the detection of an incoming missile as determined by said missile warning system; an unclassified local area network connecting an output of said missile warning system to said unclassified local area network; and
,a filter system for preventing classified information from being transmitted from the missile warning system to said unclassified local area network. - View Dependent Claims (15, 16, 17, 18)
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19. The method for preventing classified data carried on a classified local area network from being disseminated to an unclassified local area network, comprising:
providing at least one of a physical partition between the classified local area network and the unclassified local area network only discrete signal lines for the management of the classified data, optical isolators at the ends of each line, the frequency response of the optical isolators being a narrow band frequency response, a predefined interface which controls the format of and response to the classified data, the predefined interface constituting a barrier between the classified data and data to be transmitted on the unclassified channel. - View Dependent Claims (20)
Specification