Sub-mm displacement measure via multi-band phase estimation in a photonics-based radar system

The phase coherence among multi-band signals generated by a photonics-based radar is exploited to perform differential phase estimation for enhanced displacement measures. The system employs stepped frequency continuous waves simultaneously in the S- and X-band, measuring the differential phase over a synthetic band up to 7.4GHz. The experimental results demonstrate a precision < 200µm without using correction algorithms.

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