Fig. 1. Block diagram for the feature extraction for event detection
Fig. 2. Time-range distribution and probability density function of gradients without preprocessing for one target
Fig. 3. Time-range distribution and probability density function of gradients with preprocessing for one target
Fig. 4. Time-range distribution and probability density function of gradients for one target
Fig. 5. Time-range distribution and probability density function of gradients for two targets
Fig. 6. Time-range distribution and probability density function of gradients for three targets
Fig. 7. Time-range distribution and probability density function of gradients for seduction chaff detection, t = 2.75 s
Fig. 8. Time-range distribution and probability density function of gradients for seduction chaff detection, t = 4.75 s
Fig. 9. Entropy according to time when seduction chaff launches(t = 2.5 s)
Table 1. Entropy according to the number of targets
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