Radar apparatus and antenna apparatus therefor
The present disclosure relates to a radar apparatus and an antenna system for the radar apparatus. A first transmitting antenna group and a first receiving antenna group are constituted by elongating some of a plurality of transmitting antennas and a plurality of receiving antennas in a first direction of vertical directions, a second transmitting antenna group and a second receiving antenna group are constituted by elongating the other antennas in a second direction opposite to the first direction, transmitting antennas to transmit transmission signals and receiving antennas to receive reflection signals reflected from an object are appropriately selected, thereby being able to improve horizontal and vertical angular resolving power in both of mid/long-range sensing and short-range sensing.
1. A radar apparatus, comprising:
a transmitting antenna set configured to include: a first transmitting antenna group including a first transmitting antenna elongated in a first direction of vertical directions; and a second transmitting antenna group including a second transmitting antenna and a third transmitting antenna that are elongated in a second direction opposite to the first direction and spaced from the first transmitting antenna by a first vertical distance;
a receiving antenna set configured to include: a first receiving antenna group including a first receiving antenna and a second receiving antenna that are elongated in the first direction; and a second receiving antenna group including a third receiving antenna and a fourth receiving antenna that are elongated in the second direction and spaced from the first receiving antenna group by a second vertical distance;
a transceiver configured to transmit transmission signals through the transmitting antenna set and receive reflection signals reflected from an object through the receiving antenna set; and
a processor obtaining information about the object by processing the received reflection signal,
wherein the third receiving antenna and the fourth receiving antenna each include k array antennas, the second transmitting antenna, the third transmitting antenna, the first receiving antenna, and the second receiving antenna each include 2 k array antennas, and the first transmitting antenna includes 4 k array antennas.
2. The radar apparatus of claim 1 , wherein a horizontal distance between the second transmitting antenna and the third transmitting antenna is two times a horizontal distance B between the third receiving antenna and the fourth receiving antenna.
3. The radar apparatus of claim 2 , wherein when a horizontal distance among the first receiving antenna, the first transmitting antenna, and the second transmitting antenna group is A, the first receiving antenna and the second receiving antenna are spaced by a horizontal distance 2 A respectively left and right from the second receiving antenna group.
4. The radar apparatus of claim 3 , wherein the horizontal distance A among the first receiving antenna, the first transmitting antenna, and the second transmitting antenna group is two times larger than the horizontal distance between the third receiving antenna and the fourth receiving antenna.
5. The radar apparatus of claim 4 , wherein the k is 2 and the horizontal distance B between the third receiving antenna and the fourth receiving antenna is not larger than the wavelength of transmission signals.
6. The radar apparatus of claim 4 , wherein the k is 1 and the horizontal distance B between the third receiving antenna and the fourth receiving antenna is half or less than the wavelength of transmission signals.
7. An antenna system for a radar apparatus, the system comprising:
a transmitting antenna set configured to include: a first transmitting antenna group including a first transmitting antenna elongated in a first direction of vertical directions; and a second transmitting antenna group including a second transmitting antenna and a third transmitting antenna that are elongated in a second direction opposite to the first direction and spaced from the first transmitting antenna by a first vertical distance; and
a receiving antenna set configured to include: a first receiving antenna group including a first receiving antenna and a second receiving antenna that are elongated in the first direction; and a second receiving antenna group including a third receiving antenna and a fourth receiving antenna that are elongated in the second direction and spaced from the first receiving antenna group by a second vertical distance,
wherein the third receiving antenna and the fourth receiving antenna each include k array antennas, the second transmitting antenna, the third transmitting antenna, the first receiving antenna, and the second receiving antenna each include 2 k array antennas, and the first transmitting antenna includes 4 k array antennas.
8. The antenna system of claim 7 , wherein a horizontal distance between the second transmitting antenna and the third transmitting antenna is two times a horizontal distance B between the third receiving antenna and the fourth receiving antenna.
9. The antenna system of claim 8 , wherein when a horizontal distance among the first receiving antenna, the first transmitting antenna, and the second transmitting antenna group is A, the first receiving antenna and the second receiving antenna are spaced by a horizontal distance 2 A respectively left and right from the second receiving antenna group.
10. The antenna system of claim 9 , wherein the horizontal distance A among the first receiving antenna, the first transmitting antenna, and the second transmitting antenna group is two times larger than the horizontal distance between the third receiving antenna and the fourth receiving antenna.
11. The antenna system of claim 10 , wherein the k is 2 and the horizontal distance B between the third receiving antenna and the fourth receiving antenna is not larger than the wavelength of transmission signals transmitted through the transmitting antenna set.
12. The antenna system of claim 10 , wherein the k is 1 and the horizontal distance B between the third receiving antenna and the fourth receiving antenna is half or less than the wavelength of transmission signals transmitted through the transmitting antenna set.