Patent ID: 7525477

Claim:
A distance measuring device that measures a distance to an object, comprising: an impulse generator that generates an impulse; a transmission antenna that transmits the impulse generated by the impulse generator; a reception antenna that receives a reflected signal of the impulse, transmitted from the transmission antenna and reflected by the object, and a leakage signal of the impulse, transmitted from the transmission antenna; a distance calculator that calculates the distance to the object, based on the a time difference between the reflected signal and the leakage signal received by the reception antenna; a delay unit that delays the reflected signal and the leakage signal by a plurality of delay times; and an adder unit that adds the delayed reflected signal and the delayed leakage signal to the reflected signal and the leakage signal, respectively, wherein the distance calculator calculates the distance to the object, based on a delay time for an output signal having the highest amplitude among output signals of the adder unit.