A modular water vapour radiometer for comparing water vapour radiometer topologies and calibration techniques

A modular water vapour radiometer (WVR) is presented. This WVR can be used to compare different K-band radiometer topologies and calibration techniques to quantify calibration errors and establish other performance metrics. The base configurations include homodyne, super-heterodyne, and direct detection receivers, while the selectable calibration techniques include internal and external noise sources and tippingcurve calibration.