Radar for vehicle and method of operating the same

1. A radar for a vehicle, comprising:

Tx antennas for a middle range;

Tx antennas for a short range;

Rx antenna columns for a middle range each configured to have a long shape vertically and be horizontally disposed;

Rx antenna columns for a short range each configured to have a long shape vertically and be disposed between some of the Rx antenna columns for the middle range; and

a control unit configured to process signals of radio waves that are reflected from a specific object after the radio waves are radiated by the Tx antennas for the middle range and that are received by the Rx antenna columns for the middle range or signals of radio waves that are reflected from a specific object after the radio waves are radiated by the Tx antennas for the short range and that are received by the Rx antenna columns for the short range,

wherein the Rx antenna columns for the middle range that overlap with the Rx antenna columns for the short range are configured to selectively connect to a middle range reception circuit or a short range reception circuit by switches, and

wherein Rx antenna columns for the long range that do not overlap with the Rx antenna columns for the short range are grouped every two or more, and the grouped Rx antenna columns are connected to a single reception line, and Rx antenna columns for the long range that overlap with the Rx antenna columns for the short range are connected to respective reception lines.

2. The radar according to claim 1 , wherein Rx antennas included in each of the Rx antenna columns for the middle range and each of the Rx antenna columns for the short range are vertically arranged.

3. The radar according to claim 1 , further comprising:

a transmission circuit configured to supply power for transmitting Tx radio waves to the Tx antennas for the middle range or the Tx antennas for the short range in response to an instruction from the control unit; and

a Tx switch unit configured to selectively connect the Tx antennas for the middle range or the Tx antennas for the short range and the transmission circuit in response to an instruction from the control unit.

4. The radar according to claim 1 , further comprising:

a reception circuit configured to demodulate the signals received by Rx antennas for the middle range or Rx antennas for the short range and to transfer the demodulated signals to the control unit; and

an Rx switch unit configured to selectively connect the Rx antennas for the middle range or the Rx antennas for the short range and the transmission circuit in response to an instruction from the control unit.

5. The radar according to claim 1 , wherein the control unit is configured to control the Tx antennas for the middle range so that the Tx antennas radiate Tx radio waves in a first time interval and to control the Tx antennas for the short range so that the Tx antennas radiate Tx radio waves in a second time interval.

6. The radar according to claim 5 , wherein the control unit is configured to:

group the signals, received by the Rx antenna columns for a long range that overlap with the Rx antenna columns for the short range, every two or more and process the grouped signals in the interval in which the Tx radio waves for the middle range are radiated, and

process each of the signals received by the Rx antenna columns for the short range in the interval in which the Tx radio waves for the short range are radiated.

7. A method of operating a radar for a vehicle, comprising Tx antennas for a middle range, Tx antennas for a short range, Rx antenna columns for a middle range each configured to have a long shape vertically and be horizontally disposed, and Rx antenna columns for a short range each configured to have a long shape vertically and be horizontally disposed, the method comprising:

selectively connecting the Tx antennas for the middle range or the Tx antennas for the short range to a transmission circuit;

tracking a middle range object based on signals of radio waves that have been reflected from a specific object after the radio waves are radiated by the Tx antennas for the middle range and that have been received by the Rx antenna columns for the middle range; and

tracking a short range object based on signals of radio waves that have been reflected from a specific object after the radio waves are radiated by the Tx antennas for the short range and that have been received by the Rx antenna columns for the short range,

wherein the Rx antenna columns for the short range are disposed between some of the Rx antenna columns for the middle range,

wherein the Rx antenna columns for the middle range that overlap with the Rx antenna columns for the short range selectively connect to a middle range reception circuit or a short range reception circuit by switches, and

wherein Rx antenna columns for the long range that do not overlap with the Rx antenna columns for the short range are grouped every two or more, and the grouped Rx antenna columns are connected to a single reception line, and Rx antenna columns for the long range that overlap with the Rx antenna columns for the short range are connected to respective reception lines.

8. The method according to claim 7 , wherein tracking the middle range object comprises performing Adaptive Cruise Control (ACC).

9. The method according to claim 7 , wherein tracking the short range object comprises performing a stop & go function for preventing a short range collision.

10. The method according to claim 7 , wherein:

the tracking the middle range object comprises grouping signals, received by Rx antenna columns for the long range that overlap with the Rx antenna columns for the short range, every two signals and processing the grouped signals; and

the tracking the middle range object comprises processing each of signals received by the Rx antenna columns for the short range.

11. The method according to claim 7 , wherein Rx antennas are vertically arranged in each of the Rx antenna columns for the middle range and each of the Rx antenna columns for the short range.