Radar device

A radar device for emitting a wave into space, receiving the wave reflected by an object present in the space, and performing signal processing on the received wave to measure the object, comprising:

• an oscillator for generating the wave;
• a transmitting element for emitting the wave generated in the oscillator into the space;
• a local wave extracting unit for extracting a part of the wave generated in the oscillator to output the part of the wave as a local wave;
• a plurality of receiving elements provided at positions different from each other, for receiving an incoming wave and outputting the received wave;
• a plurality of receivers each using the local wave output from the local wave extracting unit to detect the received wave received by each of the plurality of receiving elements to generate a real received signal;
• a plurality of inter-channel phase correcting units for multiplying the real received signal obtained by each of the plurality of receivers by a phase correction factor different for each of the plurality of receivers, the phase correction factor being represented by a complex number;
• a spatio-temporal Fourier transform unit for performing two-dimensional Fourier transform on a phase-corrected received signal output from each of the plurality of inter-channel phase correcting units in a time axis direction as well as in a receiving element direction;
• and
• a sign selecting unit for selecting a signal having a larger amplitude when two signals in a positive direction and a negative direction symmetrical with respect to a direction at 0 degree, which have a positive frequency and a negative frequency symmetrical to each other, are detected in the spatio-temporal Fourier transform unit.