Automated identification of a quiet calibration interval within contaminated calibrator data. The top panel shows the dynamic spectra of a calibrator observation (Cassiopeia A) contaminated by solar emission, with vertical dashed cyan lines marking the start and end of the automatically identified quiet interval. The bottom panel displays the smoothed composite score time series, derived from statistical measures of variability, non-Gaussianity, and entropy across sliding time windows. The horizontal green line marks the 25th percentile threshold used to define ‘quiet’ intervals. The selected segment (between red dashed lines, from 13:48:20 to 13:50:18 UTC) represents the longest continuous window below this threshold and is used for reliable calibration.