Radar apparatus and method for determining range side lobe

1. A radar apparatus, comprising:

an estimation circuit that outputs a plurality of pieces of data each including information in which a distance to a target and a direction to the target are estimated based on a reception signal including a reflected wave that is a radar signal reflected by the target, the radar signal being transmitted by the radar apparatus, and information on a relative velocity with respect to the radar apparatus; and

a processing circuit that determines a range side lobe component in the target based on the estimated distance, the estimated direction of one or more pieces of data selected from the plurality of pieces of data and the relative velocity.

2. The radar apparatus according to claim 1 ,

wherein the processing circuit determines another piece of data as the range side lobe component, the other piece of data being a piece of data in which each of a difference from the estimated direction of the selected one or more pieces of data and a difference from the estimated distance of the selected one or more pieces of data is within a first threshold.

3. The radar apparatus according to claim 2 , wherein:

each of the plurality of pieces of data includes information on power,

the processing circuit groups one or more pieces of data into one or more groups, the one or more pieces of data being one or more pieces of data in which the power is equal to or greater than a second threshold, the one or more groups being one or more groups in which each of the difference from the estimated distance and the difference from the estimated direction is within a third threshold, and

the processing circuit sets one piece of the one or more pieces of data included in the one or more groups as the selected one or more pieces of data.

4. The radar apparatus according to claim 2 ,

wherein the processing circuit outputs information on a piece of data different from the other piece of data that has been determined as the range side lobe component among the plurality of pieces of data.

5. The radar apparatus according to claim 1 ,

wherein the processing circuit outputs information indicating whether each of the plurality of pieces of data is the range side lobe component.

6. The radar apparatus according to claim 1 ,

wherein the estimated direction is one or both of an azimuth angle and an elevation angle.

7. The radar apparatus according to claim 1 , further comprising:

a transmission antenna and a reception antenna, the transmission antenna being used to transmit the radar signal, the reception antenna being used to receive the reflected wave, one or both of the transmission antenna and the reception antenna including a plurality of antenna elements.

8. The radar apparatus according to claim 7 ,

wherein the plurality of antenna elements is arranged on a two-dimensional plane.

9. A method for determining a range side lobe, comprising:

outputting a plurality of pieces of data each including information in which a distance to a target and a direction to the target are estimated based on a reception signal including a reflected wave that is a radar signal reflected by the target, the radar signal being transmitted by the radar apparatus, and information on a relative velocity with respect to the radar apparatus; and

determining a range side lobe component in the target based on the estimated distance, the estimated direction of one or more pieces of data selected from the plurality of pieces of data and the relative velocity.