Radar apparatus

A radar apparatus, comprising:

• a radar transmission circuit that transmits a radar signal from a transmission array antenna;
• and
• a radar reception circuit that receives, from a reception array antenna, a reflected wave signal that is the radar signal reflected at a target, wherein:
• one of the transmission array antenna and the reception array antenna includes a first antenna element group having m antenna elements arranged at a first interval Dt along a first axis direction, wherein m is an integer of 1 or larger;
• the other one of the transmission array antenna and the reception array antenna includes a second antenna element group having n+1 antenna elements arranged at a second interval Dr(n) along the first axis direction, wherein n is an integer of 1 or larger;
• the first interval Dt satisfies equation 1:
• Dt=nt×dH,
• wherein dH denotes a first basic interval, and nt is an integer of 1 or larger;
• the second interval Dr(n) satisfies equation 2:
• Dr(n)=(nr(n)×nt+1)dH,
• wherein
• nr=[nr(1),nr(2), . . . ,nr(Na−1)],nr(n)=nr(Na−n),
• Na is an integer satisfying 1≤n<Na−1;
• and
• nr satisfies equation 3:
• nr(Na/2)=1,
• when Na is an even number, and
• nr(Na−1)/2)=1
• and
• nr(Na+1)/2)=1,
• when Na is an odd number.