Title: Doppler radar for forecasting collision

Abstract: A Doppler radar for forecasting collision, in which three consecutive Doppler signals are obtained by radiating microwave forwardly from the front of a car, the frequency of the microwave being consecutively switched in three steps at a constant interval, and combining the aforesaid microwave and reflected microwave reflected from an object for obtaining intelligence about the distance of the object from the car front, residual time left for the object to reach the car front as well as forecasting collision or non-collision from two of the three Doppler signals and obtaining intelligence about the sense of relative velocity of the object relative to the car front from the remaining Doppler signal and one of the aforesaid two Doppler signals.

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Inventors: Watanabe, Masahiro (Sagamihara, JA)
Shibuya, Hideo (Sagamihara, JA)
Sakai, Yasuhide (Kawasaki, JA)
Hori, Ryuji (Yokohama, JA)
Kamiharako, Mistuaki (Yokohama, JA)
Sato, Kazuo (Toyota, JA)

Application Number: 442240
Filing Date: 1974-02-13
Publication_date: 1976-04-20
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JA); Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota, JA)
Primary Class(es): 342/112 342/72, 342/114
Other Classes:
US Patent Ref:

2476301	Jul, 1949	Jenks	343/7.
3394342	Jul, 1968	Walker	343/7.
3684309	Aug, 1972	Uchiyamada et al.	343/7.
3697985	Oct, 1972	Faris et al.	343/7.
3750172	Jul, 1973	Tresselt	343/9.
3766554	Oct, 1973	Tresselt	343/9.

Other Refs:
Primary Examiner: Hubler, Malcolm F.
Assistant Examiner:
Attorney: Stevens, Davis, Miller & Mosher