SYSTEM DESCRIPTION On or near the Rectenna site, an antenna called the Phase Measurement Antenna (PMA) receives signals from a transmitter located near the center of the Spacetenna, called the Spacetenna Reference Transmitter (SRT), and from the particular power module being phase tuned (calibrated). Analysis of these signals provides sufficient information to generate a phase error correction term which is sent up to the on-board phase control circuitry, shown in Figure 1, of the power module undergoing calibration. I Phase Tuning During Normal Power Transmission Simultaneous with the transmission of the power beam, coherent signals at three different frequencies are transmitted from the Spacetenna. Two of these signals are transmitted from the SRT, and one is transmitted from the power module being phase tuned, as shown in Figure 2. The two signals transmitted from the SRT are respectively called si and sr^, and the signal transmitted by the power module being phase tuned is called s7. The frequency of si is midway between that of sri and S2 so that the beat frequency of si and 52 is the same as that of si and sr1. FIGURE 2 INTERFEROMETRIC PHASE CONTROL FIGURE 1 POWER MODULE PHASE CONTROL CIRCUITRY
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