5.2 The Astro-SPAS Reference Concept 5.2.1 Concept Evolution Astro-SPAS was chosen for the advanced demonstrator reference concept for the reasons discussed in Section 3. Specifically, it is an existing platform that contains most of the pointing, power, pay load mass and volume, and other functions needed by this second Powersat demonstrator. The nearly two-tonne payload capability gives it a clear advantage over all possible alternatives. Its simple interfaces allow necessary upgrades and modifications to be made if needed. Astro-SPAS is recoverable and needs only one Shuttle launch, unlike Eureca which requires a separate two Shuttle launches 6 months apart Astro- SPAS is also relatively inexpensive to lease. The reference concepts described below are outlined in less detail than the ASAP demonstrator. This is because its mission and system requirements will depend on the success of the initial demonstrator, and whether a microwave or laser approach is adopted. 5.2.2 . Microwave Advanced Demonstrator The goals of the microwave advanced demonstrator should be to, • transmit much higher power levels than the initial experiment, ♦ perform validation of subsystems and control procedures applicable to a future operational Powersat, and • demonstrate high-precision co-orbiting with a target while transmitting power over an extended period. The reference configuration is shown in Figure 5.2-1 and the mission profile is shown in Figure 5.2-2. A few hours after launch, the Shuttle’s RMS tt
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