Detection device, radar device, detection method, and detection program

A detection method for detecting a target based on a reception signal obtained from the reflection signal of a transmission signal, the method comprising:

• acquiring at least one Doppler frequency component that indicates the amplitude level of a reception signal, for at least one Doppler frequency, based on the reception signal;
• inputting the Doppler frequency component to a first filter and a second filter having mutually different time constants to identify a first region and a second region other than the first region, based on reception signal, and to detect an edge of the first region when a difference value between output levels of the first filter and the second filter for the reception signal is over a threshold;
• suppressing a Doppler frequency component representing clutter, out of a portion of the Doppler frequency component corresponding to the second region, to form a decluttered portion of the Doppler frequency component corresponding to the second region;
• and
• combining the reception signal corresponding to the first region and the decluttered portion of the Doppler frequency component corresponding to the second region.

A non-transitory computer readable medium storing a detection program for causing a computer to execute detection to detect a target based on a reception signal obtained from the reflection signal of a transmission signal, the detection program causing the computer to execute:

• Doppler frequency component generation processing to acquire at least one Doppler frequency component that indicates the amplitude level of a reception signal, for at least one Doppler frequency, based on the reception signal;
• region identification processing of the Doppler frequency component by a first filter and a second filter having mutually different time constants to identify a first region and a second region other than the first region, based on the reception signal and to detect an edge of the first region when a difference value between output levels of the first filter and the second filter for the reception signal is over a threshold;
• second Doppler frequency component suppression processing to suppress the Doppler frequency component of clutter, out of the Doppler frequency component corresponding to the second region, to form a decluttered portion of the Doppler frequency component corresponding to the second region;
• and
• combination processing to combine the reception signal corresponding to the first region and the decluttered portion of the Doppler frequency component corresponding to the second region.