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Adaptive Single-Channel Direct Signal Suppression for Ambient Noise Passive Radar Sounding

We present a passive radar sounding approach that performs direct signal suppression (DSS) with a single-channel receiver. The modified passive sounding signal processing algorithm leverages a blind deconvolution filter to estimate the direct path of the ambient noise source before using CLEAN processing for DSS. We then highlight the results of our single-channel DSS technique with both synthetic and experimental data, and we analyze its performance in terms of SNR improvement. We find that by combining an adaptive blind deconvolution approach with the CLEAN algorithm, we obtain an SNR improvement of over 10 dB for both synthetic and experimental data. The single-channel DSS technique is a further step towards low-resource, high SNR passive sounding with ambient radio noise, as it eliminates the requirement for long integration times and a two-channel DSS system.