Patent ID: 6335701
Filing Date: 2002-01-01
Classification: G01S

Abstract:
A radar system comprising:a transmitter/receiver for transmitting repeatedly electromagnetic waves which are pulse-modulated with a predetermined pulse width at a predetermined pulse interval, and detecting a phase of a receiving signal reflected from an observation target; A/D converting means for converting the receiving signal into a digital signal at a predetermined sampling interval; range gate means for extracting the receiving signal having a time corresponding to the predetermined pulse width at an interval of a delay time corresponding to a distance from the observation target; data dividing means for dividing the receiving signals into two groups of data, which come from the observation target located at the same distance; first Doppler FFT means for fast-Fourier-transforming one group of data of the two groups of divided data; second Doppler FFT means for fast-Fourier-transforming the other group of data of the two groups of divided data; complex conjugating means for taking a complex conjugate of an output of said second Doppler FFT means; complex multiplying means for performing a complex multiplication for the every same Doppler frequency component with respect to an output of said first Doppler FFT means and an output of said complex conjugating means; and complex adding means for repeating the observation and processing a plural number of times, and coherently adding an obtained result of the complex multiplication the same number of times as the repetitions with respect to the same Doppler frequency component.