Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Reexamination Certificate
2005-06-07
2005-06-07
Sotomayor, John B. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
C342S192000, C342S196000, C342S159000, C342S107000, C342S02600R
Reexamination Certificate
active
06903678
ABSTRACT:
A vehicle radar system extracts peak frequencies fbu and fbd of respective beat signals B1to B9representing the frequency difference between a transmission signal fs and a plurality of received signals fr1to fr9. The phase difference of respective beat signals B1to B9at the peak frequencies fbu and fbd is converted into a frequency signal. In the case of reflection from a close range road surface or raindrops, the phase difference of each beat signal is irregular. The peak frequency intensity of a converted frequency signal is small. This system compares the peak frequency intensity of the converted frequency signal with predetermined criterion intensity. Then, the system identifies an objective with a close range road surface or raindrops when the peak frequency intensity of the converted frequency signal is not larger than the predetermined criterion intensity.
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Kumon Hiroaki
Tamatsu Yukimasa
Denso Corporation
Posz Law Group , PLC
Sotomayor John B.
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