Communications: directive radio wave systems and devices (e.g. – Aircraft collision avoidance system – With transponder
Patent
1994-10-06
1997-04-22
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
Aircraft collision avoidance system
With transponder
342 37, G01S 1387, G01S 1393
Patent
active
056232683
ABSTRACT:
A device is provided for interrogating airborne SSR transponders at an airport, in which in certain regions which are made non-active, P1 pulses are transmitted followed, with the correct timing, by P2 pulses which have the same or a larger amplitude than the P1 pulses. As a consequence, SSR transponders in these regions are blocked or muted, and this blocking or muting is repeated, whereas in one or a few selected regions, normal interrogating signals are transmitted. Spreading of transmitted pulses to higher levels above ground is countered by keeping the energy of the pulses low and the vertical gain of transmitter antennas small.
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"Performance measurements of the transponders aboard aircraft at Gatwick Airport" (London) Eurocontrol Experimental Centre, EEC Task No. AV08, WPDG No. 1/86/RS, EEC Report No. 195.
International Standards, Recommended Practices and Procedures for Air Navigation Services, Aeronautical Telecommunications, Annex 10 to the Convention on Internat'l Civil Aviation, vol. I, Fourth Ed of vol. I,--Apr. 1985, Pt.I&II.
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British Technology Group Ltd.
Lobo Ian J.
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