Radar apparatus with multi-input multi-output antenna
The present provides a radar apparatus and an antenna for the radar apparatus. Further, 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 elongated in the first direction; and
a second receiving antenna group including a third receiving antenna and a fourth receiving antenna elongated in the second direction and spaced from the first receiving antenna group by a second vertical distance;
a transceiver configured to transmit time-divided or code-divided transmission signals through the transmitting antenna included in the first transmitting antenna group and the transmitting antennas included in the second transmitting antenna group, and receive reflection signals reflected from the target through the receiving antenna set, in a mid/long-range sensing mode; and
a processor configured to obtain azimuth information of an object on the basis of reflection signals received through all of the receiving antennas included in the first receiving antenna group and the second receiving antenna group, in the mid/long-range sensing mode,
wherein, the transceiver transmits transmission signals time-divided or code-divided through the second transmitting antenna and the third transmitting antenna, and receives reflection signals reflected from the object through the receiving antenna set in a short-range sensing mode, and the processor obtains horizontal azimuth of the object on the basis of reflection signals received through the third receiving antenna and the fourth receiving antenna in the short-range sensing mode, and
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 , further comprising:
a virtual RX antenna creator configured to create one or more virtual RX antenna among first to fourth receiving antennas in the mid/long-range sensing mode, and create one or more virtual RX antennas at sides of the third receiving antenna and the fourth receiving antenna in the short-range sensing mode.
3. 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.
4. The radar apparatus of claim 3 , 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.
5. The radar apparatus of claim 4 , 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 B between the third receiving antenna and the fourth receiving antenna.
6. The radar apparatus of claim 5 , 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.
7. The radar apparatus of claim 5 , 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.
8. The radar apparatus of claim 1 , wherein a first transmission signal in the mid/long-range sensing mode is different in frequency band a waveform from a second transmission signal in the short-range sensing mode.
9. The radar apparatus of claim 8 , wherein a first frequency band of the first transmission signal is smaller than a second frequency band of the second transmission signal, and a first number of waveforms of first transmission signals included in one sensing period is smaller than a second number of waveforms of second transmission signals included in one sensing period.