A radar system comprising: multiple transmission radars (100-n Tx) for emitting transmission signals with different frequencies, each frequency being generated using a pulse signal and an intrapulse modulation signal used for performing frequency modulation on the pulse signal; a receiving unit (220-n Rx) for converting received signals of the transmission signals that return from a target on reflection, into a reception video signal; a frequency domain transforming unit (231-n Rx) for transforming the reception video signal into signals based on a velocity and a range in such a way that Doppler frequencies of the target belongs to a same velocity bin number regardless of a change in the frequencies of the transmission signals where the transformation is performed by using a chirped z-transform whose transform function is changed on the basis of the transmission frequencies; a correlation unit (232-n Rx; 232a-n Rx) for generating reference signals based on a transmission frequency of the multiple transmission radars and a Doppler frequency corresponding to the velocity in each velocity bin number, and performing pulse compression by correlation process in the frequency domain between output signals from the frequency domain transforming unit and the reference signals, to generate signals based on a velocity and a range after correlation, the signals being separate for each of the transmission frequencies of the multiple transmission radars; an integrating unit (233-n Rx) for integrating output signals from the correlation unit using target arrival angle candidates, to generate band-synthesized signals based on a velocity and a range after correlation; a target candidate detecting unit for performing detection of a target candidate on output signals from the integrating unit on a basis of signal strength; and a target's relative-velocity/relative-range/arrival-angle calculating unit for calculating a relative velocity, a relative range, and an arrival angle of the target candidate. multiple transmission radars (100-n Tx) for emitting transmission signals with different frequencies, each frequency being generated using a pulse signal and an intrapulse modulation signal used for performing frequency modulation on the pulse signal; a receiving unit (220-n Rx) for converting received signals of the transmission signals that return from a target on reflection, into a reception video signal; a frequency domain transforming unit (231-n Rx) for transforming the reception video signal into signals based on a velocity and a range in such a way that Doppler frequencies of the target belongs to a same velocity bin number regardless of a change in the frequencies of the transmission signals where the transformation is performed by using a chirped z-transform whose transform function is changed on the basis of the transmission frequencies; a correlation unit (232-n Rx; 232a-n Rx) for generating reference signals based on a transmission frequency of the multiple transmission radars and a Doppler frequency corresponding to the velocity in each velocity bin number, and performing pulse compression by correlation process in the frequency domain between output signals from the frequency domain transforming unit and the reference signals, to generate signals based on a velocity and a range after correlation, the signals being separate for each of the transmission frequencies of the multiple transmission radars; an integrating unit (233-n Rx) for integrating output signals from the correlation unit using target arrival angle candidates, to generate band-synthesized signals based on a velocity and a range after correlation; a target candidate detecting unit for performing detection of a target candidate on output signals from the integrating unit on a basis of signal strength; and a target's relative-velocity/relative-range/arrival-angle calculating unit for calculating a relative velocity, a relative range, and an arrival angle of the target candidate.