Abstract
In this paper, we have proposed a phase-derived-range (PDR) method for direct sampling of linear-frequency-modulated radar signals. This method is capable of measuring multiple scatterers' ranges of a target and yields root-mean-squared range error values at subwavelength level; therefore, it has great potential to measure micromotions of moving targets and is of significant importance for target recognition. The main challenge that we have solved is extracting ambiguous Doppler phases from high-resolution range profiles generated through a match filter. For guiding the implementation in radar systems, restraint conditions of radar parameters have been systematically justified based on the principle of ambiguity resolution. We have provided a systematic algorithm flowchart for PDR, especially for wideband direct sampling radars. Both simulated and experimental results under different radar parameter settings are presented and validate the performance.
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