Decoupling composite modulation models in frequency-scanning interferometry for dynamic absolute ranging using a multi-synchrosqueezing transform

We present a decoupling method for a composite modulation model in a simple frequency-scanning interferometry (FSI) scheme for dynamic absolute ranging. The method employs a multi-synchrosqueezing transform for data processing, enabling accurate and robust estimation of the instantaneous frequency and effective separation of target motion from the interference signal within the composite modulation model. Both simulations and experimental results demonstrate the proposed FSI scheme's superior dynamic ranging performance. In vibration target measurements at a standoff distance of 15 m, the system achieved a relative error of less than 9.78% for amplitude and 1.60% for frequency in the range of 100-1000 Hz in vibration target measurement.