Identification device and identification method

An identification method used in an identification device including:

• M transmission antenna elements, M being an integer greater than or equal to 1;
• N receivers disposed surrounding a predetermined area and each including a reception antenna element, N being an integer greater than or equal to 3;
• a memory;
• and a circuit, the identification method comprising:
• transmitting, using the M transmission antenna elements, a first transmission signal to a predetermined area including a first living body;
• receiving a first reception signal by each of the N receivers using the reception antenna element during a predetermined period, the first reception signal including a reflection signal obtained as a result of the first transmission signal being reflected by the first living body;
• reading, from the memory, teacher signals which are M×N second reception signals obtained as a result of the N receivers receiving, in advance, second reception signals including reflection signals obtained as a result of second transmission signals being transmitted from the M transmission antenna elements to a second living body and reflected by the second living body;
• calculating a plurality of correlation coefficients from the teacher signals which have been read and M×N first reception signals obtained as a result of each of the N receivers receiving the first reception signal;
• performing biometric authentication of the first living body according to whether or not a maximum value of the plurality of correlation coefficients calculated exceeds a threshold;
• and
• identifying by a predetermined method the first living body and the second living body as identical when the biometric authentication of the first living body is to be performed.