RADAR CALIBRATION SYSTEM FOR VEHICLES
Disclosed herein is a radar calibration system for vehicles. The radar calibration system for vehicles includes a target simulator receiving a radar signal through a reception antenna, delaying the received signal through a delay line, and transmitting the delayed signal through a transmission antenna, and a radar apparatus transmitting the radar signal to the target simulator through a transmission antenna, receiving the delayed signal from the target simulator through a plurality of reception antennas, calculating phase differences among the delayed signals received through the plurality of reception antennas, and generating and storing phase correction values of reception channels of the plurality of reception antennas to correct the calculated phase differences.
1 . A radar calibration system for vehicles comprising:
a target simulator receiving a radar signal through a reception antenna, delaying the received signal through a delay line, and transmitting the delayed signal through a transmission antenna; and
a radar apparatus transmitting the radar signal to the target simulator through a transmission antenna, receiving the delayed signal from the target simulator through a plurality of reception antennas, calculating phase differences among the delayed signals received through the plurality of reception antennas, and generating and storing phase correction values of reception channels of the plurality of reception antennas to correct the calculated phase differences.
2 . The radar calibration system for vehicles according to claim 1 , wherein the target simulator includes the transmission antenna, the reception antenna, a delay line unit causing the received signal to pass through a delay passage having a predetermined length to delay the signal received through the reception antenna, and a transmission controller transmitting the signal having passed through the delay line unit to the radar apparatus through the transmission antenna.
3 . The radar calibration system for vehicles according to claim 2 , wherein the delay line unit includes an optical cable.
4 . The radar calibration system for vehicles according to claim 1 , wherein the radar apparatus transmits the radar signal to the target simulator through the transmission antenna, receives the delayed signal from the target simulator through a reception antenna array including the plurality of reception antennas, detects phases of the signals received by the reception channels of the plurality of reception antennas, calculates phase correction values causing the phases of other reception channels to be identical with the phase of one reception channel selected from the reception channels, and stores the calculated phase correction values in a memory of the radar apparatus.
5 . A radar calibration system for vehicles comprising:
a target simulator including a transmission antenna, a reception antenna, a delay line unit causing a signal received through the reception antenna to pass through a delay passage having a predetermined length to delay the received signal, and a transmission controller transmitting the signal having passed through the delay line unit to the radar apparatus through the transmission antenna; and
a radar apparatus including a transmission antenna and a reception antenna array including a plurality of reception antennas, transmitting a radar signal to the target simulator through the transmission antenna, receiving a signal transmitted from the target simulator through the plurality of reception antennas, detecting phases of the signals received by reception channels of the plurality of reception antennas, calculating phase correction values causing the phases of other reception channels to be identical with the phase of one reception channel selected from the reception channels, and storing the calculated phase correction values in a memory of the radar apparatus.
6 . The radar calibration system for vehicles according to claim 5 , wherein the delay line unit includes an optical cable.
7 . The radar calibration system for vehicles according to claim 5 , wherein the target simulator and the radar apparatus are arranged so that the signal transmitted by the transmission antenna of the target simulator is transmitted to the radar apparatus in the direction of 0 degrees regardless of the zero point of the signal transmitted by the radar apparatus.