| 摘要 |
PURPOSE:To extract only an objective signal from the signal congested with >= two waves, by measuring the pulse repetition period and the pulse width of a received unknown signal to generate a gate signal synchronized with the objective signal. CONSTITUTION:The unknown signal received by an omnidirectional antenna 31 is detected and amplified and is supplied to a circuit 35, which measures a pulse repetition period PRI and a pulse width PW, and a video signal display equipment 36 such as an A scope. Meanwhile, the output of a directional rotary antenna 40 is detected and is supplied to a gate signal generating circuit 39 and a switch circuit 43. PRI and PW data from the circuit 35 or PRI and PW data which are set manually by the operator while watching the display equipment 37 are applied to the circuit 39 to generate a gate signal synchronized with a signal to be extracted from the signal obtained from the detector 42. The switch circuit 43 is operated by this generated gate signal to take out the signal to be extracted. |
