| 摘要 |
PURPOSE:To amplify the received outputs of many wave receiving elements with a small number of preamplifiers by sequentially switching first and second switching means, selecting the received outputs of the wave receiving elements in an order of arrangement, and amplifying and sending out the outputs through the preamplifiers. CONSTITUTION:Wave receiving elements 1-120CH are equally divided into (m) pieces in (n) sets. A frequency shifting means is composed of a first switching means SWa, a second switching means SWb and a switch control means. The first switching means SWa selects any one output of the received outputs at the same order from the wave receiving elements in the (n) sets. The selected output is inputted into the respective (m) pieces of preamplifiers P1-P60. The preamplifiers are provided so as to match the corresponding numbers in the sequence. The second switching means SWb selects the outputs of the (m) pieces of the preamplifiers and sends the outputs to a received-wave-beam forming means 1. The switch control means sequentially switches the first and second switching means so as to select the received outputs of the wave receiving elements 1-120CH in the order of arrangement. The signals which are amplified in the preamplifiers P1-P60 are sequentially outputted.
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