For SPS subarray antenna measurements, a proposed electronics measurements equipment block diagram is shown in Fig. 4. Here, use of a microcomputer will permit error compensation of such factors as nonlinearity of receiver and detector. Use of a high precision amplitude reference permits absolute received power measurements. The system is phase locked and the atmospheric effects are normalized out. Key development areas for this concept are a precision calibrated microwave variable attenuator, a precision absolute amplitude reference source, and a precision calibrated standard gain antenna. Fig. 2. Fractional beam power for SPS subarray pattern, (a) Definition of beam parameters, (b) Fractional beam power.
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