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Goal of the Gain Calibration procedure is to calibrate the noise generator by performing several Total Power measurements (using BBC filters previously defined by the user) on a set of radio sources with radio flow known from the literature. Having selected the radio sources on which to calibrate, the procedure automatically plans the slewing, at different elevations, always considering the theoretical flux in Jy. Therefore, for each radio source, these Total Power measurements will be performed:
- ON source (on the radio source, with noise generator OFF)
- OFF source (off radio source with noise generator OFF)
- CAL (off radio source with noise generator ON)
Measurements recorded in every step are used to calibrate the noise generator and the radio telescope and this will allow to record antenna temperature and flux measurements.
NSGen noise generator for absolute calibration can be used only with SPIDER radio telescopes.