Water vapour induces variable attenuation and delay for mm-wave propagation through the atmosphere which may impede mm-wave VLBI measurements. Therefore, new potential sites require a survey for precipitable water vapour (PWV). We present the preliminary design of a monolithic microwave integrated circuit (MMIC) water vapour radiometer (WVR) observing the 22 GHz water vapour line and 31 GHz liquid water continuum. A unique approach to simulating radiometers is presented which makes use of a combination of RF system simulators and a microelectronic process design kit (PDK). We further present a method for estimating resolution based on a subset of sampled output data to reduce simulation times.
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