Figure 7-49. Microwave power transmission system phase front control concepts. sensitive power density indicators with rapid response characteristics. If one such sensor were required for each 100 m2 of rectenna area, the total number required for the proposed system would approach one million. The Command system offers a valid system for safety monitoring and control, but does not appear to possess a capability of resolution to the degree necessary for high order phase corrections. The Adaptive phase front control system (Fig. 7-49) requires a calibrated phase reference distribution system at the transmitter array, linking subarray elements to the central reference signal. It also requires at least 1652 receiver units (one for each subarray) to accept the ground developed pilot beam, compare it to the reference signal, and make appropriate phase adjustments. The heart of this system is the reference signal and its distribution, and this is the phase that requires the most development. A number of ways to carry out phase reference distribution have been discussed including calibrated coaxial line, space-fed laser techniques, and combinations of these. It
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