|
GRAVI Pipeline Reference Manual 1.9.0
|
This file contains code to remove the modulation signal from the metrology data. The main function gravi_metrology_demodulate is called by the gravity_vis recipe before proceeding with the standard metrology reduction. The demodulation is accomplished by splitting the exposure into chunks of no more than 100s duration (over which the change in modulation parameters due to sky motion can be safely neglected), fitting a model for the modulation to each chunk, and removing the modelled component.