Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-09-29
1986-08-26
Jordan, Charles T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 7A, 367 90, G01S 1300, G01S 1358, G01S 966
Patent
active
046085688
ABSTRACT:
A speed detecting device comprises a comparing circuit for comparing the amplitude of a Doppler signal with a reference amplitude value, and an excluding circuit for excluding a speed signal corresponding to the Doppler signal of the amplitude smaller than the reference amplitude value, whereby the speed signal corresponding to the Doppler signal of the amplitude larger than a predetermined value.
One embodiment of the device further comprises a circuit for selecting and outputting a Doppler signal of the largest amplitude, thereby detecting a vehicle speed based on the Doppler signal of the largest amplitude.
Another embodiment of the device comprises a modulator for sequentially changing transmitting frequency of the Doppler radar into a plurality of frequencies at a predetermined period, a detector circuit for detecting each Doppler signal from the Doppler radar in synchronism with the change of the transmitting frequency, a signal processing circuit for forming a Doppler signal corresponding to the transmitting frequency, and a selecting circuit for selecting a Doppler signal of the largest amplitude.
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Jordan Charles T.
Kabushiki Kaisha Komatsu Seisakusho
Steinberger Brian S.
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