Grating Lobe Suppression of Multicycle IR-UWB Collaborative Radar Sensor in Wireless Sensor Network System

A novel algorithm for the separation between distributed radar sensor nodes of the virtual nonlinear array is proposed for collaborative beamforming in the wireless sensor network (WSN) system. The proposed algorithm can produce a single beam radiation pattern of the collaborative virtual radar array. The presented radiation pattern is proposed for the Gaussian-shaped multicycle impulse radio ultra-wideband (IR-UWB) beamforming, which effectively reduces the grating lobes, despite electrically large separation between transmitting nodes. A prototype for the time-domain beam-pattern measurement is developed for proof of concept. The measurement results show better than 6 dB suppression for sidelobe radiation.