| 摘要 |
PURPOSE:To enable the detection of a min. sensitivity point or max. sensitivity point with high accuracy, by differentially integrating the receiving output of a directional characteristic antenna by two cyclical gate signals and shifting the phases of the gate signals so as to allow said integration value to approach zero. CONSTITUTION:A directional characteristic antenna 11 is rotated to obtain rotary directional characteristic receiving output.A from a rotary goniometer 16. This output is synthesized with the output of a sense antenna circuit 18 b6y a synthesizer circuit 17 to obtain a synthesis signal C wherein a max. sensitivity point and a min. sensitivity point appears one at a time at every one rotation of an antenna direction. This synthesis signal C is gated by gate signals E, F different in a phase to each other outputted from a time series signal generator 31 and each gate output is differentially integrated by an integrator circuit 41. This integrator circuit 41 is reset at each cycle of the envelope of the receiving output A and the phases of the gate signals E, F are shifted by a judge circuit 45 so as to allow said integration value to approach zero to attain the coincidence of the max. sensitivity point and the min. sensitivity point. |
