A compact integrated 100 GS/s sampling module for UWB see through wall radar with fast refresh rate for dynamic real time imaging

This paper presents the development of a compact integrated sampling module for Ultra Wideband (UWB) see through wall radar. The development of this radar is geared towards see through wall imaging and micro-Doppler detection of any human motions. The radar transmits a UWB impulse signal for high rang resolution and utilizes 8 Vivaldi antenna array as receive array to achieve fine azimuth resolution. UWB data acquisition and high system data rate are two of the main challenges in designing UWB radar. By using equivalent time sampling method, a data acquisition solution is proposed and a compact module is implemented upon integrating a dual channel ADC chip and a Xilinx FPGA in one circuit board. See through wall experiments in a real scenario have been carried out to demonstrate the performance of this compact sampling module. The module supports two equivalent time sampling channels with maximal 100GS/s sample rate. It meets system update data rate requirement for Doppler processing, meanwhile it still can scan 8 receiver antennas and gives out 2D image of targets behind the wall.