| 摘要 |
PURPOSE:To correct a phase error and to obtain accurately an azimuth angle error signal and an elevation angle error signal by amplifying a sum signal and a difference signal obtained as the output of a monopulse comparator through respective intermediate frequency amplifiers. CONSTITUTION:An input signal 1 from a target is received by a multi(four)-beam antenna 30 constituting a monopulse antenna to obtain antenna outputs 2, 3, 4, and 5 corresponding to the four beams, and they are inputted to a monopulse comparator 31 to obtain the sum signal 6, the 1st error signal 7 containing error information on an azimuth angle, and the 2nd difference signal 8 containing error information on an elevation angle. The 1st switch output 9 obtained by dividing the 1st difference signal 7 and the 2nd difference signal 8 by time is supplied to the 2nd mixer 34 to obtain the 2nd mixer output 13 by using a local oscillator output 25, and the output is amplified by the 2nd intermediate amplifier 36 to obtain the 2nd intermediate frequency amplifier output 13, which is inputted to a synchronous detector 37. A digital computing element 44 obtains the azimuth angle error signal 16 and elevation angle error signal 17. |
