Patent ID: 8390509

Claim:
A radar system comprising: a transmission antenna; at least two reception antennas; a transmitting unit that transmits a frequency-modulated transmitting signal as a transmitted wave transmitted via the transmission antenna; a receiving unit that receives reflected waves that are the transmitted waves reflected by targets including a stationary target and a moving target and that are received via the at least two reception antennas as receiving signals of the respective reception antennas; a direction calculating unit that calculates a phase difference between beat signals at respective peak frequencies to calculate directions of the targets on the basis of the calculated phase difference, wherein the beat signals are generated from the transmitting signal and the receiving signals of the respective reception antennas; a storage unit that stores the phase difference, calculated by the direction calculating unit, in a storage area; a prediction unit that predicts whether peak frequencies of the plurality of targets overlap each other on the basis of predicted information, which includes direction information about the directions of the targets, calculated by the direction calculating unit, and which predicts a variation in the peak frequency of each of the beat signals; and a predicted phase difference calculating unit that calculates a predicted phase difference of the stationary target at the time when the peak frequencies overlap each other on the basis of the phase difference stored in the storage area, and that calculates a predicted phase difference of the moving target on the basis of the phase difference calculated by the direction calculating unit and the predicted phase difference of the stationary target, wherein when the prediction unit predicts that the peak frequencies overlap each other, the direction calculating unit calculates the direction of the moving target on the basis of the predicted phase difference of the moving target, calculated by the predicted phase difference calculating unit.