FMCW radar system and method using up and down chirp similarity to determine length of target
The present disclosure relates to a vehicle radar, a vehicle radar controlling method, and a vehicle radar controlling system. Specifically, the vehicle radar includes a signal transmitter which transmits a transmission signal for detecting a target object, a signal receiver which receives a reception signal including a target signal generated by the transmission signal being reflected by the target object, and a signal processor which processes the reception signal to form a frequency spectrum of the reception signal. Specifically, the signal processor 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.
1. A frequency modulated continuous wave (FMCW) radar comprising:
a signal transmitter which transmits a transmission signal for detecting a target object;
a signal receiver which receives a reception signal including a target signal generated by the transmission signal being reflected by the target object; and
a signal processor which processes the reception signal to form a frequency spectrum of the reception signal,
wherein the signal processor 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.
2. The FMCW radar of claim 1 , wherein the signal processor extracts a magnitude spectrum vector of each of the up-chirp frequency and the down-chirp frequency using the window size and determines the spectrum similarity based on the extracted magnitude spectrum vectors.
3. The FMCW radar of claim 2 , wherein the signal processor uses a correlation coefficient between the extracted magnitude spectrum vectors as the spectrum similarity.
4. The FMCW radar of claim 1 , wherein, if the spectrum similarity is greater than the preset threshold value, the signal processor determines the length of the target object using factors such as the determined window size, a light velocity, and a frequency bandwidth.
5. 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.
6. The FMCW radar controlling method of claim 5 , wherein the determining spectrum similarity comprises extracting a magnitude spectrum vector of each of the up-chirp frequency and the down-chirp frequency using the window size, and determining the spectrum similarity based on the extracted magnitude spectrum vectors.
7. The FMCW radar controlling method of claim 6 , wherein the determining spectrum similarity comprises using a correlation coefficient between the extracted magnitude spectrum vectors as the spectrum similarity.
8. The FMCW radar controlling method of claim 5 , wherein the determining a length of the target object comprises, if the spectrum similarity is greater than the preset threshold value, determining the length of the target object based on the window size.
9. 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.