The Extended LM method For Multiple Frequencies Micro-Doppler Radar for Human Heartbeat Sensing

Micro-Doppler radar is attracting attention as a technology to wirelessly sense small movement of human body such as heartbeat measurement. The off-the-shelf 24 GHz micro-Doppler radar can easily detect the human vital signals. To enhance the detection performance, many signal processing algorithms have been proposed. One of key issue for improving the detection performance is the DC-offset estimation of the micro-Doppler radar because the DC-offset has direct impact on the radar's movement estimation accuracy. This paper proposes a new accurate DC-offset estimation algorithm that is based on state-of-the-art multiple frequencies micro-Doppler radar.