Multiplex communications – Wide area network – Packet switching
Patent
1993-12-27
1995-08-08
Hsu, Alpus
Multiplex communications
Wide area network
Packet switching
370 76, 370 953, 375285, 375346, 379 63, 455 63, H04J 400, H04M 1100
Patent
active
054405440
ABSTRACT:
An integrated full duplex radio data link for aircraft capable of a sustained 4 to 8 Mb/sec raw data transfer rate communicates on newly proposed dedicated digital channels (DDC) for radio communications between the existing analog VHF amplitude modulated (AM) voice channels, and causes no perceptible interference to the remaining AM voice channels. While the present invention is intended primarily for terminal areas and airport surface applications, it may be employed with enroute applications. The present invention transmits AM encoded digital aircraft identification information appended to AM voice transmissions. An ground unit strips off the aircraft identification and assigns a DDC frequency to that aircraft unit over a control uplink channel (CUC) for further data communication. Downlink information, such as acknowledgement of the DDC assigned is transmitted over a digital control downlink channel (CDC). Data communication then proceeds on the DDC. The data is transmitted as a low power encoded signal having a constant envelope, and narrow bandwidth. Any interference from the DDC into the AM voice channel appears as background "white noise" to the AM receiver. The channel assignment scheme allows the present invention to function at an acceptable bit error rate.
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Nov. 1993--"Integrated VHF Data Link for Air Traffic Control Applications", Handouts for a Presentation at the Air Traffic Control Assoc. (ATCA) Conference.
Nov. 1993--"12.5 khz Offset Channel High Capacity VHF Data Link", Handouts Given During the Presentation to the FAA at Emergy Riddle Aeronautical Univ., Daytona Beach, Fla.
Apr. 1993--Confidential `White Paper` Marked as `GE Confidential` Sent to the Federal Aviation Administration (FAA) in Response to a Broad Area Announcement RFI 930219-0465.
Dec. 1992--"Integrated VHF Data Link Concept for Air Traffic Control Applications", Slides of a Talk Given to the FAA at General Electric CR&D, Schenectady, N.Y.; and the FAA and Mitre Corp. which Evaluates Proposals for the FAA, at the FAA.
Oct. 1992--"Integrated VHF Data Link Concept for Air Traffic Control Applications", Slides of a Talk Given to the FAA and Mitre Corp., Washington, D.C.
Oct. 1992--"Integrated VHF Data Link Concept for Air Traffic Control Applications" Provided as a Confidential Document to the FAA and Mitre Corp.
General Electric Company
Hsu Alpus
Snyder Marvin
Zale Lawrence P.
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