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Methods of Reducing the Minimum Observable Signals in the Presence of Noise
Three proposed methods of reducing the minimum observable signal are evaluated. It is found that two of the methods namely, the "stenode" receiver and the pre-detection "Type A" presentation, offer no appreciable reduction in the minimum observable echo of the conventional radar system.Experiment indicates that homodyne detection, the third proposed method, offers from 5 to 15 decibels of reduction in the minimum observable echo of the conventional radar receiver. The amount of this reduction depends upon the i-f bandwidth of the receiver and the pulse width and repetition rate of the signal appearing at the input of the receiver. Unfortunately, the homodyne reductionin the minimum observable echo is found to be realizable onlyin a radar system operating on stationary targets.
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