Radar systems

Details Radar systems Radar systems

1975-08-27

1978-08-22

Hunt, Brooks H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 956

Patent

active

041092481

ABSTRACT:
A secondary radar system for establishing the position and identity of aircraft etc. on airfields, particularly for controlling their ground movements during bad visibility, comprises a pair of spaced aerials each arranged to successively transmit a particular one of two interrogate pulses, the time relationship between the two pulses being varied such that a predetermined time relationship between the two interrogate pulses obtains at varying distances from said spaced aerials to afford selective interrogation of a transponder receiving the two interrogate pulses, and a third aerial spaced from the pair of spaced aerials for transmitting a further pulse in a second predetermined time relationship with one of the interrogate pulses whereby a selected transponder or transponders receiving said two interrogation pulses in said predetermined time relationship is caused to be suppressed.

REFERENCES:
patent: 3754251 (1973-08-01), Thornberg et al.
patent: 3801980 (1974-04-01), Danton et al.
Benoit et al., Plans & Developments for Air Traffic Systems, 1975, pp. 21-1 to 21-8, May 1975.

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