Radar device

A radar apparatus, comprising:

• four transmission antennas;
• three reception antennas;
• a radar transmission circuit to which the four transmission antennas are connected and which, in operation, outputs a radar signal;
• and
• a radar reception circuit to which the three reception antennas are connected and which, in operation, inputs a reflected wave signal that is the radar signal reflected by a target, wherein
• the three reception antennas are arranged in a first direction in a first order of a first antenna, a second reception antenna, and a third reception antenna,
• the first reception antenna is adjacent to the second reception antenna at a first interval,
• the second reception antenna is adjacent to the third reception antenna at a second interval,
• a length of the first interval is shorter than a length of the second interval,
• the four transmission antennas are arranged in the first direction in a second order of a first transmission antenna, a second transmission antenna, a third transmission antenna, and a fourth transmission antenna,
• the first transmission antenna is adjacent to the second transmission antenna at a third interval,
• the second transmission antenna is adjacent to the third transmission antenna at a fourth interval,
• the third transmission antenna is adjacent to the fourth transmission antenna at a fifth interval,
• a length of the third interval is greater than a length of the fourth interval,
• the length of the fourth interval is greater than a length of the fifth interval, and
• the three reception antennas are arranged at different positions from the four transmission antennas.

A radar signal processing method, comprising:

• outputting a radar signal by a radar transmission circuit to which three transmission antennas are connected;
• and
• inputting a reflected wave signal that is the radar signal reflected by a target by a radar reception circuit to which four reception antennas are connected, wherein
• the three transmission antennas are arranged in a first direction in a first order of a first transmission antenna, a second transmission antenna, and a third transmission antenna,
• the first transmission antenna is adjacent to the second transmission antenna at a first interval,
• the second transmission antenna is adjacent to the third transmission antenna at a second interval,
• a length of the first interval is shorter than a length of the second interval,
• the four reception antennas are arranged in the first direction in a second order of a first reception antenna, a second reception antenna, a third reception antenna, and a fourth reception antenna,
• the first reception antenna is adjacent to the second reception antenna at a third interval,
• the second reception antenna is adjacent to the third reception antenna at a fourth interval,
• the third reception antenna is adjacent to the fourth reception antenna at a fifth interval,
• a length of the third interval is greater than a length of the fourth interval,
• the length of the fourth interval is greater than a length of the fifth interval, and
• the three transmission antennas are arranged at different positions from the four reception antennas.

A radar signal processing method, comprising:

• outputting a radar signal by a radar transmission circuit to which four transmission antennas are connected;
• and
• inputting a reflected wave signal that is the radar signal reflected by a target by a radar reception circuit to which three reception antennas are connected, wherein
• the three reception antennas are arranged in a first direction in a first order of a first reception antenna, a second reception antenna, and a third reception antenna,
• the first reception antenna is adjacent to the second reception antenna at a first interval,
• the second reception antenna is adjacent to the third reception antenna at a second interval,
• a length of the first interval is shorter than a length of the second interval,
• the four transmission antennas are arranged in the first direction in a second order of a first transmission antenna, a second transmission antenna, a third transmission antenna, and a fourth transmission antenna,
• the first transmission antenna is adjacent to the second transmission antenna at a third interval,
• the second transmission antenna is adjacent to the third transmission antenna at a fourth interval,
• the third transmission antenna is adjacent to the fourth transmission antenna at a fifth interval,
• a length of the third interval is greater than a length of the fourth interval,
• the length of the fourth interval is greater than a length of the fifth interval, and
• the three reception antennas are arranged at different positions from the four transmission antennas.