Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-06-03
1978-03-07
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 937, G01S 944
Patent
active
040782352
ABSTRACT:
An obstacle detecting system comprising an oscillating device for generating and directing to an obstacle a first oscillating signal in a first time period and a second oscillating signal having a different frequency than that of the first oscillating signal in a second time period; an antenna for receiving the signals reflected from the obstacle; a detector for mixing the signals received by the antenna and the output of the oscillating device to generate a detected signal which comprises a first signal component derived by mixing the first oscillating signal reflected by the obstacle and received by the antenna with the second oscillating signal generated by the oscillating device and a second signal component derived by mixing the second oscillating signal reflected by the obstacle and received by the antenna with the second oscillating signal generated by the oscillating device; and an information signal circuit for receiving the detected signal and generating information relating to the distance between the antenna and the obstacle and information relating to the relative velocity of the antenna and the obstacle.
REFERENCES:
patent: 3750171 (1970-09-01), Faris
patent: 3766554 (1973-10-01), Tresselt
patent: 3846796 (1974-11-01), Oishi et al.
patent: 3863253 (1973-05-01), Kiyoto et al.
patent: 3864678 (1975-02-01), Yamanaka et al.
Noda Hiroshi
Watanabe Yukiyasu
Hubler Malcolm F.
Mitsubishi Denki & Kabushiki Kaisha
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