6. TRANSMITTING ANTENNA 6.1 Aperture Illumination and Size 6-1 6.2 Array Types 6-10 6.3 Subarray Types 6-16 6.4 Subarray Dimensions 6-16 6.5 Subarray Layout 6-20 6.6 Tolerance and Attenuation 6-26 6.6.1 Frequency Tolerance 6-26 6.6.2 Waveguide Dimensional Tolerances 6-27 6.6.3 Waveguide Attenuation 6-28 6.7 Mechanical Design and Analysis 6-29 6.7. 1 Thermal Analysis and Configuration 6-29 6.7.2 Materials 6-38 6.7.3 Transportation, Assembly and Packaging 6-43 6.8 Attitude Control and Alignment 6-47 6.9 Conclusions and Recommendations 6-49 7. PHASE FRONT CONTROL 7.1 Adaptive Phase Front Control 7-4 7.2 Command Phase Front Control 7-10 7.2.1 Phase Estimation 7-10 7.2.2 Bit Wiggle 7-14 7.3 Conclusions and Recommendations 7-14 APPENDIX A - RADIO WAVE DIFFRACTION BY RANDOM IONOSPHERIC IRREGULARITIES A. 1 Introduction A-l A. 2 Model for Electron Density Irregularities A-2 A. 3 Phase Fluctuations and Their Spatial Correlation at the Diffracting Screen A-3 A. 4 Phase and Amplitude Fluctuations and Their Spatial and Temporal Correlation Functions on an Observational Plane A-4
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