Radar arrangement for measuring velocity of an object

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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343 9R, 343 12A, G01S 1358

Patent

active

044266472

ABSTRACT:
44A radar arrangement (1) suitable for measuring the horizontal velocity v of an aircraft relative to the ground (2) comprises an high-frequency signal generator (10) including a transmitting aerial (9), a receiver including two aerials (12, 11) spaced a distance d apart along a line in the direction of the velocity to be measured and respective mixers (30, 31) and filters (32, 33), and a correlator (15) which determines the value (.tau.=d/v) of the delay of the signals received at the rearmost aerial (11) relative to those received at the foremost (12) for which the correlation is a maximum. The signal generator (10) generates two linearly frequency-modulated waves (E2, E1) and is controlled by the correlator (15) so that the interval between E2 and E1 equals .tau.. The height H of the aircraft can also easily be determined, being directly proportional to the beat frequency at the output of the filters (32, 33).

REFERENCES:
patent: 2686302 (1954-08-01), Capelli
patent: 3143734 (1964-08-01), Raabe
patent: 3147477 (1964-09-01), Dickey, Jr.
patent: 3525568 (1970-08-01), Dreyfus
patent: 3804518 (1974-04-01), Meyr
patent: 3899251 (1975-08-01), Frenk et al.
patent: 3991398 (1976-11-01), Andermo et al.
patent: 4041293 (1977-08-01), Kihlberg
patent: 4106017 (1978-08-01), Roeder et al.

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