Pulse or digital communications – Repeaters – Testing
Patent
1993-05-17
1995-05-30
Cain, David C.
Pulse or digital communications
Repeaters
Testing
342450, 342454, 342455, 342456, 342457, 342461, H04K 100
Patent
active
054208831
ABSTRACT:
Communication devices and communication network techniques are employed to meet safety-critical, operational requirements for train location and control in railroad and public transit applications. On-board and trackside communication radios participate in a synchronous, time-slotted communication network, providing contentionless and highly responsive access to all participants. Encrypted, validated, and error protected communication links provide reliable and redundant transfer of information among the train, trackside, and control station radios. Spread spectrum communication techniques enable range measurements between all participants. These wireless communication links relay train range measurements to control or processing stations and relay control information (principally speed commands) from the processing stations to the trains. High resolution position location is determined along elevated, at-grade, and in-tunnel tracks using wireless methods and sparse device placement.
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Himes John G.
Kivett James A.
Long David S.
Mayhew Gregory L.
Swensen Marvin D.
Cain David C.
Denson-Low W. K.
Hughes Aircraft Company
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