Radar device and frequency interference cancellation method thereof

A radar device comprising:

• an antenna unit for transmitting a radar transmission signal to a periphery and receiving a signal reflected from a target;
• an RF unit for generating the transmission signal, converting frequencies of the transmission signal and the reception signal, and amplifying the reception signal;
• a signal processing unit for generating a control signal to generate the transmission signal, and cancelling frequency interference from the reception signal of the RF unit;
• and
• a control unit for generating radar detection information by using an output signal of the signal processing unit, and generating tracking information by accumulating the radar detection information,
• wherein the signal processing unit includes a frequency interference cancellation unit for identifying frequency interference characteristics by comparing an envelope detection value of the reception signal of the RF unit with a predetermined threshold level to cancel a ghost target and the frequency interference that increases a noise level according to the identified frequency interference characteristics,
• the frequency interference cancellation unit cancels the ghost target by counting a minimum number of targets that commonly exist in a frequency hopping repetition interval as a reference of a number of actual targets and cancelling remaining target counts, if a value detected due to generation of the ghost target is equal to or less than the threshold level, and
• the frequency interference cancellation unit reduces the noise level, which is increased due to the frequency interference, by cancelling an interference signal through zero padding during a frequency interference signal time interval and recovering the signal into a continuous signal by using an extrapolation scheme, if the detected value exceeds the threshold level due to an increase in the noise level caused by the frequency interference.