Device and method for controlling vehicle and radar system for vehicle

1. A device for controlling a vehicle, comprising:

a spectrum generator generating a two-dimensional (2D) spectrum including a range component and a velocity component based on a plurality of chirp signals received from a radar sensor;

a range-velocity map generator generating a range-velocity map corresponding to each height value included in a height set based on the height set, the height set including a velocity of the vehicle and a plurality of height values;

a correlation coefficient determiner determining a correlation coefficient corresponding to each height value included in the height set based on the 2D spectrum and the range-velocity map; and

a target determiner estimating a height of a target based on the correlation coefficient for each height value included in the height set and recognizing the target based on a height of the target.

2. The device of claim 1 , wherein the spectrum generator obtains the range component of the 2D spectrum by executing a primary fast Fourier transform (FFT) on each of the chirp signals received from the radar sensor and obtains the velocity component of the 2D spectrum by executing a secondary FFT between the chirp signals in a result of the primary FFT to thereby generate the 2D spectrum.

3. The device of claim 1 , wherein the range-velocity map generator determines the range-velocity map corresponding to each height value included in the height set based on the height set including the velocity of the vehicle and the plurality of height values and a range set including a plurality of range values, and wherein

the velocity of the vehicle is determined based on a signal from a wheel sensor of the vehicle.

4. The device of claim 1 , wherein the target determiner recognizes an environment in which the target is present based on the correlation coefficient for each height value included in the height set, determines the height of the target present in the recognized environment, and recognizes the target based on the height of the target.

5. The device of claim 1 , wherein the target determiner determines whether the target is present and a material of the target based on the correlation coefficient for each height value included in the height set and determines a structure of the target based on the height of the target and lateral position information for the target.

6. The device of claim 5 , wherein the target determiner determines that the target whose material is a first material is present at a height of a first height value among the plurality of height values included in the height set if the correlation coefficient for the first height value is a first threshold coefficient or more.

7. The device of claim 6 , wherein the target determiner determines that the target whose material is a second material different from the first material is present at the height of the first height value if the correlation coefficient for the first height value is the first threshold coefficient or less and not less than a second threshold coefficient smaller than the first threshold coefficient.

8. The device of claim 6 , wherein the first material includes iron.

9. The device of claim 5 , wherein the target determiner determines whether the structure of the target positioned at the first height value is a first structure based on a lateral position of the target located at a first height value among the height values included in the height set.

10. The device of claim 9 , wherein the first structure includes a tunnel structure.

11. A method for controlling a vehicle, the method comprising:

generating a two-dimensional (2D) spectrum including a range component and a velocity component based on a plurality of chirp signals received from a radar sensor;

generating a range-velocity map corresponding to each height value included in a height set based on the height set, the height set including a velocity of the vehicle and a plurality of height values;

determining a correlation coefficient corresponding to each height value included in the height set based on the 2D spectrum and the range-velocity map; and

estimating a height of a target based on the correlation coefficient for each height value included in the height set and recognizing the target based on a height of the target.

12. The method of claim 11 , wherein recognizing the target based on the height of the target includes determining whether the target is present and a material of the target based on the correlation coefficient for each height value included in the height set, and wherein determining whether the target is present and the material of the target includes determining that the target whose material is a first material is present at a height of a first height value among the plurality of height values included in the height set if the correlation coefficient for the first height value is a first threshold coefficient or more.

13. The method of claim 12 , wherein determining whether the target is present and the material of the target includes determining that the target whose material is a second material different from the first material is present at the height of the first height value if the correlation coefficient for the first height value is the first threshold coefficient or less and not less than a second threshold coefficient smaller than the first threshold coefficient.

14. The method of claim 11 , wherein recognizing the target based on the height of the target includes determining a structure of the target based on the height of the target and lateral position information for the target, and wherein determining the structure of the target includes determining whether the structure of the target positioned at the first height value is a first structure based on a lateral position of the target located at a first height value among the height values included in the height set.

15. A radar system for a vehicle, comprising:

a radar sensor providing a plurality of chirp signals; and

a controller generating a two-dimensional (2D) spectrum including a range component and a velocity component based on the plurality of chirp signals provided from the radar sensor radar sensor, generating a range-velocity map corresponding to each height value included in a height set based on the height set, the height set including a velocity of the vehicle and a plurality of height values, determining a correlation coefficient corresponding to each height value included in the height set based on the 2D spectrum and the range-velocity map, and estimating a height of a target based on the correlation coefficient for each height value included in the height set and recognizing the target based on a height of the target.

16. The radar system of claim 15 , wherein the controller determines the range-velocity map corresponding to each height value included in the height set based on the height set including the velocity of the vehicle and the plurality of height values and a range set including a plurality of range values.

17. The radar system of claim 15 , wherein the controller determines the range-velocity map corresponding to each height value included in the height set based on the height set including the velocity of the vehicle and the plurality of height values and the range component included in the 2D spectrum.

18. The radar system of claim 15 , wherein the controller recognizes an environment in which the target is present based on the correlation coefficient for each height value included in the height set, determines the height of the target present in the recognized environment, and recognizes the target based on the height of the target.

19. The radar system of claim 18 , wherein the controller compares the correlation coefficient for each height value included in the height set with at least one threshold coefficient value, recognizes an environment which the target is present according to a result of the comparison, determines that a height of the target, which is equal to or larger than the threshold coefficient value, is the height of the target present in the recognized environment and stores the height of the target, compares the determined height of the target with at least one threshold difference value, and recognizes the target according to a result of the comparison.

20. The radar system of claim 19 , wherein if there are a plurality of heights of target which are equal to or larger than the threshold coefficient value, the controller determines that a height of target with a highest correlation coefficient among the heights of target equal to or larger than the threshold coefficient value is the height of the target present in the recognized environment.