Method and apparatus for accomplishing extended range TCAS using

Details Method and apparatus for accomplishing extended range TCAS using Method and apparatus for accomplishing extended range TCAS using

1997-09-30

1999-07-13

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

342 29, 342 30, 701301, G01S 302

Patent

active

059232935

ABSTRACT:
A Traffic Alert and Collision Avoidance System (TCAS) uses a dual bandwidth receiver to achieve extended range operation. During normal operations TCAS radio signals are filtered by a bandpass filter which passes all TCAS radio signals of interest. When extended range operation is desired the TCAS radio signals are filtered by a more narrow bandpass filter. The narrower filter passes only selected TCAS radio signals and improves the signal to noise ratio and thus allows detection of selected TCAS radio signals at extended range. The TCAS system switches between the normal mode and the extended range mode to detect and track aircraft at both near and far distances.

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PCT International application, International Publication No. WO 90/01202 to John Harold Dunlavy, published Feb. 8, 1990, entitled "Improvements to Aircraft Collision Avoidance".
"Introduction to TCAS II", U.S. Department of Transportation, Federal Aviation Administration, Mar. 1990.
"TCAS II Study Guide", Honeywell Inc, Jan. 1993, Pub. No. 03-3841-09-04, pp. 2-1 thru 2-5.

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