Method and apparatus for detecting surrounding environment based on sensing signals of frequency-modulated continuous wave radar and continuous wave radar
Disclosed herein are a method and apparatus for detecting a surrounding environment based on a Continuous Wave (CW) radar sensing signal and a Frequency-Modulated Continuous Wave (FMCW) radar sensing signal. A method of detecting a target based on a Frequency-Modulated Continuous Wave (FMCW) radar sensing signal and a Continuous Wave (CW) radar sensing signal may include sending, by a radar, the CW radar sensing signal for detecting the target and receiving a first response signal that is a response to the CW radar sensing signal; sending, by the radar, the FMCW radar sensing signal for detecting the target and receiving a second response signal that is a response to the FMCW radar sensing signal; generating, by the radar, the frequency spectrum of a beat signal by performing signal processing on the first response signal and the second response signal.
1. A method of detecting a target based on a Frequency-Modulated Continuous Wave (FMCW) radar sensing signal and a Continuous Wave (CW) radar sensing signal, the method comprising:
sending, by a radar, the CW radar sensing signal for detecting the target and receiving a first response signal that is a response to the CW radar sensing signal;
sending, by the radar, the FMCW radar sensing signal for detecting the target and receiving a second response signal that is a response to the FMCW radar sensing signal;
generating, by the radar, a frequency spectrum of a beat signal by performing signal processing on the first response signal and the second response signal;
when frequency signals are obtained in up-chirp and down-chirp of the frequency spectrum, respectively, adjusting, by the radar, an offset of the frequency spectrum based on information about a velocity of the target; and
detecting, by the radar, the target based on the frequency spectrum of the beat signal and based on the adjusted offset,
wherein,
the radar determines information about a stop object based on a peak value of a frequency band that belongs to a frequency spectrum of the first response signal and that corresponds to moving speed of the radar, and
when a number of the determined stop objects is equal to or higher than a specific number, the radar detects the target based on a correlation between the up-chirp of the second response signal and the down-chirp of the second response signal.
2. The method according to claim 1 , wherein the radar determines that the stop object is present if the peak value of the frequency band corresponding to the moving speed of the radar is a first threshold or higher and determines that the stop object is not present if the peak value of the frequency band corresponding to the moving speed of the radar is less than the first threshold.
3. The method according to claim 1 , wherein the radar detects the target based on the second response signal if the number of stop objects is less than the specific number as a result of determining whether the stop object is present based on the first response signal.
4. A radar for detecting a target based on a Frequency-Modulated Continuous Wave (FMCW) radar sensing signal and a Continuous Wave (CW) radar sensing signal, wherein:
the radar comprises a processor, and
the processor is configured to:
send the CW radar sensing signal for detecting the target and receive a first response signal that is a response to the CW radar sensing signal;
send the FMCW radar sensing signal for detecting the target and receive a second response signal that is a response to the FMCW radar sensing signal;
generate a frequency spectrum of a beat signal by performing signal processing on the first response signal and the second response signal;
when frequency signals are obtained in up-chirp and down-chirp of the frequency spectrum, respectively, adjust an offset of the frequency spectrum based on information about a velocity of the target; and
detect the target based on the frequency spectrum of the beat signal and based on the adjusted offset,
wherein
the radar determines information about a stop object based on a peak value of a frequency band that belongs to a frequency spectrum of the first response signal and that corresponds to moving speed of the radar, and
when a number of the determined stop objects is equal to or higher than a specific number, the radar detects the target based on a correlation between the up-chirp of the second response signal and the down-chirp of the second response signal.
5. The radar according to claim 4 , wherein the radar determines that the stop object is present if the peak value of the frequency band corresponding to the moving speed of the radar is a first threshold or higher and determines that the stop object is not present if the peak value of the frequency band corresponding to the moving speed of the radar is less than the first threshold.
6. The radar according to claim 4 , wherein the radar detects the target based on the second response signal if the number of stop objects is less than the specific number as a result of determining whether the stop object is present based on the first response signal.