Patent ID: 6703967
Filing Date: 2004-03-09
Classification: G01S

Abstract:
A distance measuring apparatus which radiates a radio wave, receives a reflected wave from an object under measurement, and detects the object under measurement, said distance measuring apparatus comprising:transmitting means for transmitting a first frequency signal and a second frequency signal having a predetermined frequency difference from the frequency of the first frequency signal during a first time period, and transmitting said first frequency signal, said second frequency signal and N frequency signals having a frequency difference equal to an integral multiple of at least twice said predetermined frequency difference during a second time period, where N is an integer at least equal to one, and said first time region is shorter than said second time region; receiving means for measuring a Doppler frequency of the reflected wave from said object under measurement at each of the respective transmission frequencies of said first frequency signal, second frequency signal, and said N frequency signals; and detection processing means for separating a plurality of objects under measurement to detect said object under measurement.