FMCW radar system and method using up and down chirp similarity to determine length of target

A frequency modulated continuous wave (FMCW) radar controlling method comprising:

• transmitting a transmission signal for detecting a target object;
• receiving a reception signal including a target signal generated by the transmission signal being reflected by the target object;
• forming a frequency spectrum of the reception signal by processing the reception signal;
• determining a window size based on the frequency spectrum of the reception signal;
• determining spectrum similarity between an up-chirp frequency and a down-chirp frequency based on the window size;
• and
• determining a length of the target object if the spectrum similarity is greater than a preset threshold value,
• wherein the forming the frequency spectrum comprises forming an up-chirp frequency spectrum and a down-chirp frequency spectrum from the reception signal, and
• wherein the determining the window size comprises determining the window size using a head frequency and a tail frequency of the up-chirp frequency and a head frequency and a tail frequency of the down-chirp frequency.

A frequency modulated continuous wave (FMCW) radar controlling system comprising:

• at least one antenna which transmits a transmission signal for detecting a target object and receives a reception signal including a target signal generated by the transmission signal being reflected by the target object;
• and
• a controller which processes at least one of the transmission signal or the reception signal,
• wherein the controller processes the reception signal to form a frequency spectrum of the reception signal, determines a window size based on the frequency spectrum of the reception signal, determines spectrum similarity between an up-chirp frequency and a down-chirp frequency based on the determined window size, and determines a length of the target object if the spectrum similarity is greater than a preset threshold value, and
• wherein the signal processor forms an up-chirp frequency spectrum and a down-chirp frequency spectrum from the reception signal and determines the window size using a head frequency and a tail frequency of the up-chirp frequency and a head frequency and a tail frequency of the down-chirp frequency.