G - Physics – 01 – S
Patent
G - Physics
01
S
343/28, 343/50
G01S 13/58 (2006.01) G01S 13/88 (2006.01)
Patent
CA 1214244
ABSTRACT OF THE DISCLOSURE 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.
413436
Kabushiki Kaisha Komatsu Seisakusho
Marks & Clerk
LandOfFree
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