Abstract
Signal space projection techniques are introduced to filter the direct-path signal component from the passive coherent location (PCL) receiver target channel. Filter performance is characterised using ambiguity function analysis of the digital audio broadcast (DAB) waveform, considered here as a PCL waveform of opportunity. For ideal DAB phase reference synchronisation, the direct-path component is perfectly eliminated. For non-ideal phase synchronisation, the direct-path component is sufficiently attenuated to permit target detection; approximately 22 dB of direct-path signal attenuation is demonstrated.
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