AWARDS: Advanced microwave radiometers for deep space stations

The objective of this study, named AWARDS Advanced microWAve Radiometers in Deep space Stations, is the preliminary design of a transmission Media Calibration System MCS to be located at an ESA Deep Space Antenna DSA site. The crucial aspect is the capability to accurately retrieve the tropospheric path delay along the line-of-sight of the deep space probe in order to allow precise tropospheric calibration of deep space observables range and range-rate with particular reference to the BepiColombo spacecraft and its primary DSA at Cebreros ES. The study focuses on two main aspects which lead to the preliminary design of the Mercury Orbiter Radioscience Experiment MORE MCS: the characterization of current microwave radiometers MWRs available at ESA/ESTEC and the atmospheric fluctuation effects on the MCS error budget, in terms of the Allan standard deviation ASD. In the course of the study, further critical aspects have been identified effects of Sun contamination, effects of ground noise emission, and mitigation strategies have been proposed. The final outcome is a preliminary design of the MWR and the entire MCS to be deployed at the ESA/ESTRACK ESA Tracking station network sites and being compliant with MORE requirements.