Through-the-wall UWB pulse radar with micro-motion detection

This paper focuses on the feasibility of tracking micro-motion with coherent Ultra-Wide Band Pulsed Radar. The proposed micro-motion detection principle consists in measuring the phase difference of the Ultra-Wide Band carrier waveform between the transmitted and the received pulse signals. Those signals are acquired directly on the working frequency band, with equivalent time sampling techniques. An experiment based on a double staged equivalent time sampling is set to emulate real-time acquisition with an oscilloscope. This experiment shows clear high precision ranging capabilities by revealing a millimeter order woofer displacement equal to lambda/10. This reveals a great potential in phase tracking and confirms the choice to go further on the development of a real time radar. This platform provides refreshing rates of 2 ms, required to developed effective phase detection algorithms for micro- motion detection and tracking of human targets, especially for through-the-wall radar applications when humans remain in static position.