Patent ID: 7548193

Claim:
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 spatial frequency information generating unit for converting a received signal string obtained by gathering phase-corrected received signals output from the plurality of inter-channel phase correcting units into a signal in a spatial frequency domain; and a sign selecting unit for selecting a signal having a larger amplitude in a spatial frequency spectrum when two signals from a positive direction and a negative direction which are symmetrical with respect to a direction at 0 degree are detected in the spatial frequency information generating unit.