Radar device and object detecting method for radar device

A radar device, comprising:

• a transmission circuit configured to transmit at least a first transmission signal having a first frequency and a second transmission signal having a second frequency different from the first frequency;
• a reception circuit configured to receive the first transmission signal and the second transmission signal, which are transmitted by the transmission circuit and are reflected by one or more objects as a first reception signal and a second reception signal;
• and
• circuitry configured to
• perform a quadrature demodulation with respect to each of the first reception signal and the second reception signal output from the reception circuit;
• rotate at least one of the first reception signal and the second reception signal, which are subjected to the quadrature demodulation, on an IQ plane by a phase angle;
• add the first reception signal and the second reception signal, of which at least one is rotated, so as to highlight a predetermined object among the one or more objects;
• and
• output obtained information relating to the highlighted predetermined object.

An object detecting method for a radar device, comprising:

• transmitting, by a transmission circuit, al least a first transmission signal having a first frequency and a second transmission signal having a second frequency different from the first frequency;
• receiving, by a reception circuit, the first transmission signal and the second transmission signal, which are transmitted by the transmission circuit and are reflected by one or more objects, as a first reception signal and a second reception signal;
• performing, by circuity, a quadrature demodulation with respect to each of the first reception signal and the second reception signal output from the reception circuit;
• storing, in a memory, a predetermined distance to a particular object of the one or more objects;
• rotating at least one of the first reception signal and the second reception signal, which are subjected to the quadrature demodulation, on an IQ plane by a phase angle determined by multiplying a difference in wavenumbers corresponding to the first and second frequencies by the predetermined distance stored in the memory;
• adding or subtracting the first reception signal and the second reception signal, of which at least one is rotated;
• detecting the one or more objects based on a processing result of the addition or subtraction;
• and
• outputting information relating to the detected one or more objects.