cost, high reliability and low heat transfer capabilities. Passive control will be predominant in the SGD-1 TCS. A critical item in the SGD-1 is its Phase Array Antenna (PAA) 10m x 10m. In fact, considering that the PAA will have an efficiency of 70% transmitting at 35GHz (technology to be developed) the internal radiation of the PAA electronics raises to 60kW as shown in Figure 10.3.7. Figure 10.3.7 Efficiency of SDG-1 Phased Array The next calculation gives an idea of heat radiated from the rear side of the PAA. The general thermal control tools of the SGD-1 are listed in Table 10.3.9. Table 10.3.9 SDG-1 Passive Thermal Control
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