NASA Radiated Field of Space To Earth Microwave

SUMMARY Statistics such as average power density pattern, variance of the power density pattern and variance of the beam pointing error are developed for a 1 km diameter monolithic transmitter and related to subsystem hardware parameters such as rms phase insertion error and rms RF power level error. Also a limitation was established on the spectral width of the phase reference used in the phase control subsystem. A 1 km transmitter in space appears technically feasible with performance virtually the same as an ideal antenna providing: (1) the total rms phase error on the transmitter does not exceed 10°, (2) the rms amplitude error on the transmitter does not exceed 10%, (3) the spectral width of the phase reference does not exceed^3 kHz. Given such conditions the first sidelobe level would be within 1.5 db of the error free case with 99.99% confidence. Also, the maximum pointing error would be less than 37 meters with 99.99% confidence.

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