| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To compensate for an offset of a beam formation phase shifter by a phased array radar. <P>SOLUTION: A high-frequency radio wave output from a phase shifter 21-1 with its amount of phase change remained to be zero and a high-frequency radio wave with its amount of phase change changed to be 90+δby a phase shifter 21-2 are combined with each other by a symmetrically connected mixer 80-12, and a potential on the basis of sinδ, or a DC current component, is output from an amplifier 82-12. When the output of the amplifier 82-12 is positive, a signal for reducing the value of a register 1230 is output from a polarity determination means 1050 through a switch 1210. When a clock pulse reaches the register 1230 from a clock 1030 through the switch 1220, and when the signal for reducing the value of the register 1230 is output, the register value is reduced by, for example, one. A compensation angleδin accordance with the register value is thus updated, and the digital value of the register 1230 is reduced until it is determined by the polarity determination means 1050 that the output of the amplifier 82-12 is zero or negative. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
