Radar device

A radar device comprising:

• a plurality of transmission antennas;
• a plurality of reception antennas;
• a number Ns of transmission circuits connected to the transmission antennas and configured to output a transmission signal;
• a number Nr of reception circuits connected to the reception antennas and configured to acquire reception signals;
• a control unit configured to process the reception signals;
• and
• a housing unit configured to house the transmission antennas, the reception antennas, the transmission circuits, the reception circuits, and the control unit;
• wherein
• Ns and Nr are each integers of 2 or more,
• the plurality of the transmission antennas and the plurality of the reception antennas are arranged such that:
• (i) at least one of the plurality of the transmission antennas and the plurality of the reception antennas is arranged at unequal intervals;
• (ii) among a group of virtual antennas assumed for each transmission antenna with respect to the plurality of reception antennas according to a phase difference of the reception signals between the reception antennas, in a collection of sets of the virtual antennas in which virtual positions overlap and a combination of a transmission circuit and a reception circuit do not match, there are included at least Ns+Nr−2 unique sets of virtual antennas, each being a set in which a combination of a transmission circuit and a reception circuit does not overlap with any other set;
• (iii) at least one different wiring length set is included, which is a set of virtual antennas with overlapping virtual positions and different wiring lengths;
• and
• (iv) a total number of belonging sets, which are sets of virtual antennas belonging to at least one of the unique sets and the different wiring length set, is at least Ns+Nr−1 sets,
• the control unit includes:
• an error acquisition unit configured to acquire error information relating to at least one of the phase difference and amplitude difference of the reception signals corresponding to a wiring length difference between the virtual antennas, based on a comparison result of the reception signals between the virtual antennas in the at least Ns+Nr−1 belonging sets;
• and
• an estimation unit configured to estimate temperature information related to internal temperature of the housing unit according to the error information.