Multi-spectral THz micro-doppler radar based on silicon-based picosecond pulse radiators

A method for modulation and demodulation using a micro-Doppler effect, the method comprising:

• radiating, using a picosecond pulse generator with an antenna, a train of THz pulses that form a frequency comb comprising a plurality of tones, wherein the frequency comb is reflected from an object such that a frequency of the plurality of tones in the frequency comb are shifted based on the speed of the object and the reflected frequency comb includes a plurality of side tones that are generated due to mechanical movements or vibrations of the object;
• and
• down-converting the reflected frequency comb, including the plurality of side tones, to an intermediate frequency (IF) to recover a THz Doppler signature of the object.