TDM FMCW radar apparatus and signal processing method of apparatus

A signal processing method of a time-division-multiplexed (TDM) frequency modulated continuous wave (FMCW) radar apparatus, the method comprising:

• a wireless transmission operation of transmitting an FMCW radar waveform signal configured such that at least three consecutive chirps included in a chirp loop of a radar signal have different periods;
• a wireless reception operation of demodulating a baseband FMCW radar signal from an FMCW radar waveform signal reflected by a target, sampling a difference signal between the baseband FMCW radar signal and the transmitted signal, transforming the difference signal into a digital signal, and outputting the digital signal;
• a spectrum analysis operation of determining and outputting a beat frequency and a Doppler frequency from the signal output in the wireless reception operation;
• and
• a Doppler frequency determination operation of measuring phase differences between the at least three consecutive chirps having different periods, which are received in the wireless reception operation, and determining and outputting a true Doppler frequency from the measured phase differences and the Doppler frequency output in the spectrum analysis operation,
• wherein the at least three consecutive chirps have a same frequency,
• wherein both a ramp time and an idle time of a first chirp are same with a ramp time and an idle time of a last chirp, and
• wherein both a ramp time and an idle time of an intermediate chirp are different from the ramp time and the idle time of both the first chirp and the last chirp.