Radar apparatus and radar method
A radar apparatus includes: a radar transmission signal generator, which in operation, outputs a plurality of radar signals; a switching controller, which in operation, switches among plurality of transmitting antennas in sequence in a determined order to every one radar signal transmission period; and a radio transmitter, which in operation, transmits one radar signal every one radar signal transmission period through a allocated transmitting antenna to which switching has been made. A plurality of transmission timings at which the allocated transmitting antennas to which switching have been made transmit each of the plurality of radar signals within a determined period have identical time differences from a reference timing within the determined period.
1. A radar apparatus comprising:
a radar signal generator, which in operation, outputs 2*Nt radar signals, Nt being an integer that is greater than 1;
a switching controller, which in operation, allocates two of the 2*Nt radar signals to each of first to Nt-th transmitting antennas in first to (2*Nt)-th non-overlapping radar signal transmission periods; and
a radio transmitter, which in operation, transmits one of the 2*Nt radar signals from one of the first to Nt-th transmitting antennas in each of the first to (2*Nt)-th non-overlapping radar signal transmission periods,
wherein the radio transmitter transmits the two radar signals allocated to the first transmitting antenna in the first and 2*Nt-th non-overlapping radar signal transmission periods, respectively, through the first transmitting antenna, and
wherein the radio transmitter transmits the two radar signals allocated to the Nt-th transmitting antenna in the Nt-th and (Nt+1)-th non-overlapping radar signal transmission periods, respectively, through the Nt-th transmitting antenna.
2. The radar apparatus according to claim 1 , wherein the radar signal generator generates the 2*Nt radar signals using complementary codes.
3. The radar apparatus according to claim 1 , wherein the radar signal generator generates the 2*Nt radar signals using Spano codes.
4. The radar apparatus according to claim 1 , wherein each of the first to (2*Nt)-th non-overlapping radar signal transmission periods has a same length.
5. The radar apparatus according to claim 1 , wherein Nt is greater than 2.
6. A radar method comprising:
outputting 2*Nt radar signals, Nt being an integer that is greater than 1;
allocating two of the 2*Nt radar signals to each of first to Nt-th transmitting antennas in first to (2Nt)-th non-overlapping radar signal transmission periods; and
transmitting one of the 2*Nt radar signals from one of the first to Nt-th transmitting antennas in each of the first to (2*Nt)-th radar non-overlapping signal transmission periods,
wherein the two radar signals allocated to the first transmitting antenna are transmitted in the first and 2*Nt-th non-overlapping radar signal transmission periods, respectively, through the first transmitting antenna, and
wherein the two radar signals allocated to the Nt-th transmitting antenna are transmitted in the Nt-th and (Nt+1)-th non-overlapping radar signal transmission periods, respectively, through the Nt-th transmitting antenna.
7. The radar method according to claim 6 , comprising generating the 2*Nt radar signals using complementary codes.
8. The radar method according to claim 6 , comprising generating the 2*Nt radar signals using Spano codes.
9. The radar method according to claim 6 , wherein each of the first to (2*Nt)-th non-overlapping radar signal transmission periods has a same length.
10. The radar method according to claim 6 , wherein Nt is greater than 2.