Probability of detection

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In the case of radar devices , the probability of detection indicates the percentage frequency with which a useful signal is displayed. It is directly dependent on the signal / noise ratio and the set threshold value and should be as large as possible. Usually the radar range is given for a detection probability of 80%. The following calculation algorithm is used for analog radar devices:

If the received echo signal is demodulated and available as a video signal (or as a data word), it is passed through threshold value circuits that should be set so that they allow useful signals above a certain amplitude to pass and largely make the noise ineffective. Since the noise contains noise peaks that are in the order of magnitude of small useful signals, a compromise must be made in the threshold value circuit. On the one hand, useful signals should be displayed from a specified minimum amplitude, on the other hand, the false alarm rate must not exceed a certain percentage.

In older publications, the probability of detection is still referred to using the English term "Blip Scan Ratio".