RADAR DEVICE

1 . A radar device which transmits a frequency-modulated transmission signal, receives a reception signal which is the transmission signal reflected by an object, and measures a distance to the object, the radar device comprising:

an average amplitude calculation unit which calculates an average amplitude of a beat signal which is based on the transmission signal and the reception signal; and

an interference detection unit which detects an interference signal with respect to the reception signal on a basis of the average amplitude of the beat signal calculated by the average amplitude calculation unit.

2 . The radar device according to claim 1 ,

wherein the interference detection unit detects the interference signal by setting a threshold value obtained by multiplying a predetermined magnification to the average amplitude of the beat signal and comparing the beat signal and the threshold value.

3 . The radar device according to claim 2 ,

wherein the interference detection unit changes the magnification depending on a surrounding environment of the radar device or the object.

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

an interference suppression unit which suppresses interference by the interference signal by multiplying the beat signal by a window function.

5 . The radar device according to claim 4 ,

wherein the window function at least has a value at a position where the interference signal has been detected is larger than or equal to 0 and less than 1.

6 . The radar device according to claim 1 ,

wherein the average amplitude calculation unit calculates an average value or an effective value of the beat signal at predetermined time as the average amplitude of the beat signal.

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

a subtractor which calculates a subtraction beat signal obtained by subtracting the average amplitude from the beat signal; and

a second average amplitude calculation unit which calculates an average amplitude of the subtraction beat signal,

wherein the interference detection unit detects the interference signal on a basis of the average amplitude of the subtraction beat signal calculated by the second average amplitude calculation unit.

8 . The radar device according to claim 7 ,

wherein the interference detection unit detects the interference signal by setting a threshold value obtained by multiplying a predetermined magnification to the average amplitude of the subtraction beat signal and comparing the subtraction beat signal and the threshold value.

9 . The radar device according to claim 8 ,

wherein the interference detection unit changes the magnification depending on a surrounding environment of the radar device or the object.

10 . The radar device according to claim 7 , the radar device further comprising:

an interference suppression unit which suppresses interference by the interference signal by multiplying a predetermined range of the subtraction beat signal, including a position where the interference signal has been detected, by a window function.

11 . The radar device according to claim 10 ,

wherein the window function at least has a value at a position where the interference signal has been detected is larger than or equal to 0 and less than 1.

12 . The radar device according to claim 7 ,

wherein the second average amplitude calculation unit calculates an average value or an effective value of the subtraction beat signal at predetermined time as the average amplitude of the subtraction beat signal.

13 . The radar device according to claim 1 ,

wherein the transmission signal is an FMCW signal obtained by frequency-modulating a continuous wave.