| 摘要 |
Antenna elements A1 to A24 of a ring-shaped array antenna are selectively connected to power combiners each with a switch SH1, SH2 and SH3 one after another. When a direct wave and a reflected wave arrive in the directions of the antenna elements A5 and A3, respectively, the antenna elements A2, A5 and A8 in the power combiner SH2 are selected and their received signals are input into a receiver Rr to obtain therefrom an output Sr(2+5+6, f), and the respective antenna elements of the power combiners SH1 and SH3 are sequentially selected and their received signals are input into a receiver Rm to obtain therefrom outputs Sm(1, f), Sm(3, f). The outputs from the receivers Rr and Rm are caused to interfere with each other in an interferer 11 to detect an interference output to obtain data E(K, L). The antenna elements A3, A4, A6 and A7 are selected and their received signals are applied to the receiver Rr, and the antenna elements of the power combiner SH2 are sequentially selected and their received signals are applied to the receiver Rm, by which data E(K, L) is similarly obtained. For the thus obtained data E(K, L) an evaluation function is calculated for hologram reconstruction.
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