Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1996-11-18
1999-02-16
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342128, G01S 1334
Patent
active
RE0360953
ABSTRACT:
A time-sharing FM radar system. A plurality of beam radiating and receiving means, an FM signal generating means, a transmitting unit, a receiving unit, and a direction detecting means are configured to minimize power consumption and interference between channels. The beam radiating and receiving means are arranged to radiate partially overlapping beams in space and to receive return beams. The FM signal generating means generates an FM signal. The transmitting unit includes a plurality of transmitting switching circuits each comprised of a plurality of amplifiers. Each amplifier corresponds to one of the beam radiating and receiving means, and is configured to intermittently amplify and distribute a portion of the FM signal generated by the FM signal generating means to its corresponding beam radiating and receiving means. The receiving unit includes a plurality of receiving switching circuits and a single mixer. The receiving switching circuits comprise a plurality of amplifiers each corresponding to one of the beam radiating and receiving means. The amplifiers amplify signals received by the beam radiating and receiving means intermittently and in different timing. The mixer is configured to generate beat signals by mixing received signals output from the receiving switching circuits and a portion of the FM signal generated by said FM signal generating means. The direction detecting means detects a direction to the target based upon a ratio of the amplitude levels of the beat signals.
REFERENCES:
patent: 5181037 (1993-01-01), Komatsu
patent: 5229774 (1993-07-01), Komatsu
Komatsu Satoru
Urabe Masanobu
Hellner Mark
Honda Giken Kogyo Kabushiki Kaisha
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