Radar device

A radar device comprising:

• transmission antennas arranged at an equal distance;
• reception antennas arranged at an equal distance;
• transmission circuits connected to the transmission antennas and configured to output transmitted signals, respectively;
• receiver circuits connected to the reception antennas and configured to acquire received signals, respectively;
• and
• a controller configured to process the received signals, wherein
• a number of the transmission antennas is two or more, and is represented by Ns,
• a number of the reception antennas is two or more, and is represented by Nr,
• the transmission antennas and the reception antennas are arranged such that a number of first combinations of the transmission circuit and the receiver circuit is at least Ns+Nr−2, a number of second combinations is at least one, and a total number of third combinations is at least Ns+Nr−1,
• a first combination is one of the first combinations,
• the first combination is determined by first assuming a virtual antenna for each of the transmission antennas based on a phase difference of the received signals between the reception antennas, then extracting a collection of sets of virtual antennas whose virtual positions overlap and whose combinations of the transmission circuits and the receiver circuits do not match, and finally, among the extracted collection, determining, as the first combination, combinations of virtual antennas whose combinations of the transmission circuits and the receiver circuits are not duplicated with those of other combinations,
• a second combination is one of the second combinations,
• the second combination is a set of virtual antennas whose virtual positions overlap and whose wiring lengths do not match,
• a third combination is one of the third combinations,
• the third combination is a set of virtual antennas belonging to at least one of the first combinations or the second combinations, and
• the controller is configured to perform a compensation process to compensate for at least one of a phase difference or an amplitude difference corresponding to a wiring length difference between the virtual antennas, at least one of a phase difference or an amplitude difference between different transmission circuits, and at least one of a phase difference or an amplitude difference between different receiver circuits, based on a comparison result of the received signals between the virtual antennas in at least Ns+Nr−1 of the third combinations.