i. Evaluate alternate power transfer and drive devices for the rotary joint. j . Conduct detailed control system analysis. k. Conduct detailed investigations of composite structures and assembly techniques. 1. Investigate tension-brace concepts and compare them with the built-up section approach. m. Evaluate the local crippling stress characteristics of the basic thin material elements of the structure. n. Establish the design environments for launch into low earth orbit, transfer to synchronous orbit as well as those associated with fabrication and assembly. o. Continue investigation of near optimum antenna structural design approaches as environments, geometry, and characteristics with respect to manufacturing, assembly, maintenance, and life are matured. p. Investigate techniques to limit the maximum temperature experienced by the structural elements at the same time achieving high power output for the transmitting antenna. q. Conduct detailed investigation of transient thermal effects. r. Continue detailed investigation of approaches to establish and limit cost of assembly. s. Continue detailed investigation of transport, assembly, positioning, and maintenance operations to define man’s role and to define the equipment needed for effective support. 1.2.2.7 Receiving Antenna a. An array of small independent elements able to collect and rectify incident microwave power is required for low cost and high efficiency. b. A linearly polarized dipole with GaAs Schottky barrier diode is recommended.
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