Patent ID: 7714772

Claim:
A transmit-receive FM-CW radar apparatus comprising: at least one mixer adapted to downconvert an IF signal; at least one switch provided on an input side of the at least one mixer; and at least one controller adapted to control the at least one switch to turn on and off, wherein the timing of the on and off of the at least one switch depends on a distance from a target, and to select a signal for supplying to the at least one mixer, wherein the at least one controller is adapted to control the at least one switch to turn on and off in different modes and select the IF signal in the different modes for supplying to the at least one mixer, and wherein the different modes consist of a mode for selecting an IF signal corresponding to a about ⅓ from a leading edge of a receive timing interval, a mode for selecting an IF signal corresponding to a portion occupying up to about ⅔ from the leading edge of the receive timing interval, and a mode for selecting an IF signal corresponding to an entire portion of the receive timing interval.