A new approach is proposed to detect scatterers embedded in reciprocal media from scattering data.The new method is rooted on\r\nphysical considerations, in particular, on the optical theorem applicable to wavefields (e.g., acoustic, electromagnetic, and optical).\r\nThe approach exploits insight gained fromthe optical theoremwhich assigns physical energy interpretations to the wave data from\r\ntime reversal mirrors and cavities fromwhich one can deduce the presence of unknown scatterers in unknown background media.\r\nTheproposed approach is ideally suited for target detection in complex, highly reverberating unknown environments such as indoor\r\nfacilities, caves, tunnels, and urban canyon.
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