| 摘要 |
<p>PURPOSE:To detect frequency difference when a plurality of high frequency signals having a frequency interval of a channel dividing frequency width or less arrive simultaneously by providing a frequency difference/time difference converting means and a simultaneous arrival signal frequency difference judge means. CONSTITUTION:A plurality of signals approximate in frequency arriving at the same time are distributed to a frequency difference/time difference converting means 31 by a distributor 21 and multiplied by the output signal of a sweep oscillator 23 by a mixer 22 to become a chirp signal. The chirp signal passes through band-pass filters (BPF) 251-25n through a distributor 24 to be applied to a pulse compression filters 261-26n and the outputs of said pulse compression filters are detected by the detectors 271-27n of a simultaneous arrival signal frequency difference judge means 32 to be applied to pulse counters 291-29n through amplifiers 281-28n. The counters 291-29n count the number of compression pulses during one sweep period of the sweep oscillator 23 and the count values are supplied to a judge circuit 30 and, when the count values are 2, the frequency difference of a plurality of the simultaneously arriving signals can be detected from a time interval by time interval measuring circuits 351-35n.</p> |
