A Multifrequency Radar System for Detecting Humans and Characterizing Human Activities for Short-Range Through-Wall and Long-Range Foliage Penetration Applications

Abstract EN

A multifrequency radar system for detecting humans and classifying their activities at short and long ranges is described.

The short-range radar system operates within the S-Band frequency range for through-wall applications at distances of up to 3 m.

It utilizes two separate waveforms which are selected via switching: a wide-band noise waveform or a continuous single tone.

The long-range radar system operating in the W-Band millimeter-wave frequency range performs at distances of up to about 100 m in free space and up to about 30 m through light foliage.

It employs a composite multimodal signal consisting of two waveforms, a wide-band noise waveform and an embedded single tone, which are summed and transmitted simultaneously.

Matched filtering of the received and transmitted noise signals is performed to detect targets with high-range resolution, whereas the received single tone signal is used for the Doppler analysis.

Doppler measurements are used to distinguish between different human movements and gestures using the characteristic micro-Doppler signals.

Our measurements establish the ability of this system to detect and range humans and distinguish between different human movements at different ranges.