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The horizontal axis represents time and the vertical axis is divided into three levels from bottom to top are labeled mean noise level is denoted by G sub rec, P sub n sub i, threshold detection level 1 by G sub rec, P sub t sub min (1), and threshold detection level 2 by G sub rec, P sub t sub min (2) respectively. The radar detects the Target 1 above the threshold detection level 1 at G sub rec, P sub r sub 1 with a false alarm and Target 2 above the threshold detection level 2 at G sub rec, P sub t sub min. The false alarm is detected between the target 1 and the target 2.