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US 6,664,919 B2Granted
Radar device
AssigneeFujitsu Ten Limited
InventorOsamu Isaji
Life of this patent
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AssigneeFujitsu Ten Limited
InventorOsamu Isaji
Estimating the term…
The present invention relates to a radar device and, particularly, to a radar device mounted on a vehicle to be used for a collision alarm and the like. The invention provides a radar device that has a unit for removing the FMAM noise without lowering the signal detection sensitivity. The radar device transmits a frequency modulation signal by switching the frequency modulation signal with a first switching signal, receives a signal reflected from a target object, switches the reception signal with a second switching signal, mixes the switched reception signal with the transmission signal, and further mixes the mixed signals with a third switching signal thereby to obtain a beat signal. The radar device obtains a distance to the target object and a relative speed of the target object from the beat signal. The second switching signal and the third switching signal have the same switching frequency, and have a predetermined phase difference between the phases of the two switching signals to cancel and remove an amplitude modulation component included in the frequency modulation signal.
A radar device that transmits a frequency modulation signal by switching the frequency modulation signal with a first switching signal, receives a signal reflected from a target object, switches the reception signal with a second switching signal, mixes the switched reception signal with the transmission signal, further mixes the mixed signal with a third switching signal thereby to obtain a beat signal, and obtains a distance from the target object and a relative speed between the self and the target object from the beat signal, wherein
Dependencies are inferred from the claim text.