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**. :** 0421200023\0016

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** (.):** order statistics, statistical hypotheses testing, detection systems, probabilities of detection and false emergence, mathematical modeling

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** (.):** The concept of truncated order statistic is introduced. Analytical expressions are derived for the mean value and the variance of truncated order statistic for a threshold determined by the number of the variation series member. The algorithm of noisy signal detection is developed for detection systems, which employ the algorithm of statistical hypotheses testing and energy criterion of detection. The algorithm uses statistical characteristics of the order statistic.

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