MAtrix Radiometric System project MARS. ... Three-module experimental radiometric matrix was designed and put in operation successfully. Flowchart of the one channel is shown in Figure 1. ... Figure 1. ... In figure 2 the receiver module and switch assembly is shown. ... The elementary radiometers are combined ( figure 3 ) into the microwave unit ( one pair of horns shown is out of use ), where they integrated to use unified systems for calibration, power supply and temperature control. ...