PROBLEM TO BE SOLVED: To reduce the average number of times observation is made as needed for determination of target detection when detecting a target on the basis of a signal detection result from a sensor.SOLUTION: A target detector of the present embodiment calculates an evaluation value on the basis of a detected signal amplitude, the probability density function of signal amplitude of a false target, and the probability density function of signal amplitude of a true target when a signal detection result from a sensor that observes a target and detects a signal equal to or greater than a threshold is "signal detected," and calculates the evaluation value on the basis of the signal nondetection probability of the false target and the signal nondetection probability of the true target when the signal detection result is "signal undetected." Meanwhile, the target detector makes determination as to the evaluation value on the basis of an upper-side threshold and a lower-side threshold, determines the termination of determination as to an observation count in the signal detection result when an observation count threshold is reached and selects one of "determination terminated" and "determination pending," and selects and outputs one of "target detected," "target undetected," and "determination pending" on the basis of the result of determination as to the evaluation value and the result of determination as to the observation count.SELECTED DRAWING: Figure 1
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