Multi - Modal Standof Through - the - Wal Imaging Radar and Personnel

The ability to detect and locate stationary and moving individuals through building wals from significant standof distances provides increased situational awareness and considerable tactical advantage to security and military personnel. This paper discusses the design, implementation and detection algorithms of an ultrawideband (UWB) compact standof imaging radar for through the wal detection and identification of human targets. The conceptual system operates in S-band and operates using a UWB stepped frequency mode for highresolution imaging and location and a continuous wave (CW) mode for high resolution Doppler estimation. Results from biometric and gait exploitation algorithms presented in this paper are focused on exploiting the micro-Doppler signatures present in the UWB response. Micro-Doppler has previously been used for both personnel detection using respiratory and cardiac response in CW radar systems. This work builds on that concept and formulates a system design to combine it with a UWB sensor to alow for high-resolution localization and detection of personnel in high cluter environments. The system design focuses on simultaneous operation of stepped FM and CW modes alowing for high measurement density in both operational modalities. Theory of operation and aspects of system design are presented as wel as simulations detailing radar image reconstruction in through the wal and high cluter environments.