Proposal of Adaptive Search-and-Rescue Radar System with online Complex-Valued Frequency-Domain Independent Component Analysis

Search-and-rescue radar systems are expected to become more powerful and wider applicable in many disasters such as earthquakes and tsunamis in these days. They should realize not only the detection but also the separation of vital signals from multiple lives under debris. This paper proposes a radar system based on complex-valued frequency-domain independent component analysis (CF-ICA) to distinguish respective victims. Its microwave part working as a continuous-wave single-input multiple-output Doppler radar consists of switched multiple antennas and vector network analyzer for orthogonal detection to generate complex-valued baseband signals. Its processing part is a CF-ICA to realize signal source separation. A preliminary pendulum target experiments demonstrate that the system detects and separates multiple target signals successfully.