| 摘要 |
<p>A power divider (11) couples a received signal to a pair of signal channels. The first channel includes a pulse signal processor (14) coupled to the power divider (11) through a band reject filter (16). The second channel includes a continuous wave signal detector and processor (20) coupled to the power divider means (11) through a bandpass filter (22). The bandpass and band reject filters (22,16) are responsive to a control signal (18) for tuning the center frequencies of the respective pass band and reject band to a frequency within a predetermined range of frequencies. The continuous wave signal detector and processor (20) determines the frequency of a detected continuous wave signal using the first channel, and tunes, by producing the above-mentioned control signal (18), the center frequencies of the bandpass and band reject filters (22,16) to the frequency of the detected continuous wave signal. The band reject filter (16) rejects the continuous wave signal in the first channel. The continuous wave signal detector and processor (20) then monitors the second channel to detect the absence of the detected continuous wave signal. The pulse signal processor (14) initially detects the presence of a continuous wave signal. The frequency of the largest detected continuous wave signal is passed (24) to a controller (38) in the continuous wave signal detector and processor (20) as an initialisation signal. Only pulses detected by the pulse signal processor (14) are passed to a utilization device (32). <IMAGE></p> |
