Communications: directive radio wave systems and devices (e.g. – Radar reflector
Patent
1984-06-20
1987-01-20
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar reflector
G01S 1390
Patent
active
046383158
ABSTRACT:
A rotor tip synthetic aperture radar is described including a rotor operable to rotate, a radar receiver positioned in the rotor and for relaying received signals to a second position such as the cab of a helicopter. A radar transmitter and receiver located within the second location for transmitting radar signals towards a target and for receiving target reflected signals relayed from the rotor tip. The doppler frequency shift imposed on the relayed target reflected signals is cancelled by generating a pilot signal at a predetermined frequency and transmitting the pilot signal to the rotor tip which has a receiver for receiving the pilot signal and for relaying the pilot signal back to the second location and frequency multipliers and mixers for generating a first order doppler frequency shift signal appropriately scaled to cancel the doppler frequency shift signal of the target reflected signals when the two are subtracted in a mixer.
REFERENCES:
patent: 3182131 (1965-05-01), Barnes
patent: 3317909 (1967-04-01), Waetjen
patent: 3325736 (1967-06-01), Waetjen
patent: 3428898 (1969-02-01), Jacobsen et al.
patent: 3450842 (1969-06-01), Lipke
patent: 3611376 (1971-10-01), Gutleber
patent: 3942115 (1976-03-01), Wolejsza, Jr.
R. F. C. Vessot and M. W. Levine, "Gravitazione Sperimentale," Accademia Nazioinale del Lincei, Rome, 1977, p. 371.
Hellner Mark
Sutcliff W. G.
Tubbesing T. H.
Westinghouse Electric Corp.
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