| 摘要 |
A circuit is described which receives enemy radar signals in the form of encoded bursts or pulses, and which immediately generates and transmits, in sequence, a large number of target denial signals which are similar to the received signal. The transmitted signal masks signals from friendly craft, and deceives the enemy by providing rational false targets for him to engage. The carrier frequency of the enemy or threat, signal is detected, and is used to select one of a group of local oscillation signals which are superheterodyned with the received signal to produce an IF (intermediate frequency) signal which is recirculated and and superheterodyned with the local oscillator frequency to produce a series of signals for transmission that are similar to the received signal. The amplitude and offset doppler of each of the target denial signals are individually controlled prior to retransmission to maximize performance. In the recirculation loop, the circulated signal is hard limited, or clipped, and is also low limited, and also passed through a contoured bandpass to avoid the build up of noise.
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