| 摘要 |
PURPOSE:To measure the incoming directions of pulse-like radio waves accurately and stably by performing bearing measurement by a Watson-Watt system with one receiver. CONSTITUTION:The outputs of antennas An, Aw, As are changed over successively by a change-over circuit consisting of switch circuits S1-S3 and a frequency divider D or the like and are applied to one receiver R. These are applied together with the output of a local oscillator L to a frequency modulator M. The output of the modulator M and the output obtained from suitable steps of the divider D are applied to a bearing discriminator K, and the oscillator L is controlled by the output thereof, whereby a phase lock loop is formed. The outputs of the converter D are applied to a cathode ray tube B through switch circuits S4-S6, delay circuits B1-B2 and amplifiers A1-A3. |
