Range-time-frequency representation of a pulse Doppler radar imaging system for indoor localization and classification

Pulse Doppler radars using UWB technology are becoming very popular for their wide range of capabilities and applications. UWB waveforms are used for imaging in indoor environments, target localization and classification behind walls, and evaluating micro-Doppler signatures. Typically, CW and FMCW radars are used for measuring time Doppler frequency shifts and subsequently providing time-frequency signals. Meanwhile, UWB pulse Doppler radars provide range-time-frequency representation. This representation provides both highly accurate range and micro-Doppler information. This 3D representation (i.e. time, frequency, range) can be effectively used for detailed human gait analysis, tracking more than one object at a time even behind walls as UWB radars allow clutter removal and wall mitigation. This paper is an overview of such activities.