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- W2326310379 abstract "§This paper describes two modern phased approaches for retrodirective control of the Solar Power Satellite (SPS) transmitter. The first is an all -RF approach that directly conjugates the phase of the received signal at RF and then retransmits the conjugated sig nal. Such an arrangement has certain advantages. Fewer electronics would be needed per subarray with the potential for reduced power consumption and reduced sensitivity to thermal variations. In addition, conjugating the signal at RF allows the beam to mak e an instantaneous adjustment to any misalignment between the transmitter and receiver. Since the SPS phased array transceiver requires tremendous isolation between the transmit and receive powers, a substantial separation in frequency is necessary between the transmit and receive signals. To meet this demand, this all -RF design uses an unconventional second harmonic approach that allows a 2.9 -GHz pilot beam to guide a 5.8 -GHz transmit beam. The second approach being developed uses phase -locked loops to con jugate the pilot beam signal at a low IF frequency. Phase detectors measure the phase difference between the pilot beam signals at adjacent transmit subarrays. Meanwhile, a control loop at each subarray detects the transmitted phase relative to a reference signal common to all transmit elements. The loop compares the detected transmitted phase with the desired phase derived from the pilot receivers and creates an error signal to accelerate or decelerate the phase transmitted out that subarray. This achieves the conjugate phase necessary for retrodirectivity. An advantage of this approach is that it can operate using two independent and arbitrary frequencies for the pilot beam and transmit beam without the need for the expense and high power overhead of a Dig ital Signal Processor. Terrestrial point -to -point as well as laboratory demonstrations are being prepared for the two approaches." @default.
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- W2326310379 date "2004-08-16" @default.
- W2326310379 modified "2023-09-24" @default.
- W2326310379 title "Microwave Wireless Power Transmission with Retrodirective Beam Steering" @default.
- W2326310379 cites W2002992695 @default.
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- W2326310379 doi "https://doi.org/10.2514/6.2004-5640" @default.
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