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Passive Bistatic Radar employs a local communications transmitter as an illuminator. A template for matched-filtering is obtained by steering a beam at the transmission source. However this signal is subject to sensor noise and may also contain delayed attenuated copies of the transmitted signal. Demodulation and remodulation of the signal provides a clean template, however this also removes transmitter effects, resulting in a less than ideal mismatched filter. Estimation of the carrier drift allows transmitter effects to be re-introduced to the template signal and results in ambiguity surfaces of improved quality.