Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1994-07-08
1996-04-09
Bentley, Stephen C.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342114, G01S 1336
Patent
active
055065856
ABSTRACT:
A continuous wave radar for detecting a relative velocity between a target and a mobile object where the radar is loaded, and for detecting whether the mobile object is relatively approaching to or separating from the target. The radar has a hybrid circuit for branching an oscillation signal of a fixed frequency outputted from an oscillator into two oscillation signals. A transmitting antenna is provided for irradiating one of the oscillation signals branched by the hybrid circuit, and a receiving antenna is provided for receiving radio waves reflected from the target. The continuous wave radar further has an image cancel mixer for detecting, on the basis of the frequency of the other oscillation signal branched by the hybrid circuit, a first signal of an upper sideband frequency and a second signal of a lower sideband frequency of the received signal obtained via the receiving antenna. A signal processing circuit is provided for detecting the relative velocity of the mobile object to the target by processing the first and second signals, and detecting a relative approach of the target by processing the first signal or detecting a relative separation of the target by processing the second signal.
REFERENCES:
patent: 3665443 (1972-05-01), Galvin
patent: 4083049 (1978-04-01), Mattern et al.
patent: 4219812 (1980-08-01), Rittenbach
patent: 4499467 (1985-02-01), Rittenbach
patent: 4888744 (1989-12-01), Keeler
IEEE Standard Dictionary of Electrical and Electronics Terms, Third Edition, 1984, pp. 186-187.
Proceedings Letters, Proceedings Of The IEEE, Mar. 1977, p. 493.
Bentley Stephen C.
Fujitsu Limited
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