Far-Field Facility Concept The facility concept associated with the 11.33 km mountain top to mountain top range is depicted in Fig. 5. Assuming the maximum klystron transmit r.f. power of 32 kW per subarray, a consideration was the power densities incident on local terrain between transmit and receive site since this may constitute a hazard to personnel. At a range in the order of 500 m the antenna footprint illustrated in Fig. 6 has a peak power density of 179 mW/cm2. (The considered safety limit in the United States is 10 mW/cm2.) Power densities approach the safe limit at about 1.6 km. Figure 7 illustrates power density at 5.0 km where the peak level (1.86 mW/cm2) is well within the safe limit. To assess relative cost between far-field and near-field facility concepts, the facility configurations depicted in Figs. 8 and 9 were employed in conjunction with the proposed measurement electronics shown previously in Fig. 4. The resulting cost estimate for this approach is summarized in Table 5. Fig. 3. State-of-the-art positioner concept.
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