1. An intrusion detection system comprising: a first time modulated ultra wideband (TM-UWB) radar, wherein said first TM-UWB radar is adapted to transmit UWB pulses and receive signal returns, and wherein said UWB pulses have a wavelength corresponding to the center frequency of said UWB pulses; a second TM-UWB radar, spaced a distance from said first TM-UWB radar, said distance being greater than ¾ of said wavelength, wherein said second TM-UWB radar is adapted to transmit further UWB pulses, and wherein said further UWB pulses have said wavelength; and a processor in communications with at least said first TM-UWB radar, wherein said processor detects intrusion based on said signal returns.