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
참고문헌
- M. Skolnik, "Introduction to Radar Systems," 3rd ed. McGraw-Hill, 2002.
- M. A. Richards, J. A. Scheer, and W. A. Holm, "Principles of Modern Radar: Basic Principles," New York, NY, USA: Scitech, 2010.
- S. Liu, M. Liu, P. Li, J. Zhao, Z. Zhu, and X. Wang, “SAR Image Denoising Via Sparse Representation in Shearlet Domain based on Continuous Cycle Spinning,” IEEE Transactions on Geoscience and Remote Sensing, Vol. 55, No. 5, pp. 2985-2992, 2017. https://doi.org/10.1109/TGRS.2017.2657602
- J. Zhang, D. Zhu, and G. Zhang, “Adaptive Compressed Sensing Radar Oriented Toward Cognitive Detection in Dynamic Sparse Target Scene,” IEEE Transactions on Signal Processing, Vol. 60, No. 4, pp. 1718-1729, 2012. https://doi.org/10.1109/TSP.2012.2183127
- D. R. Wehner, "High Resolution Radar," 2nd ed. Boston: Artech House, 1995.
- J. A. Scheer and J. L. Kurtz, "Coherent Radar Performance Estimation," Boston: Artech House, 2012.
- S. R. Axelsson, “Analysis of Random Step Frequency Radar and Comparison with Experiments,” IEEE Transactions on Geoscience and Remote Sensing, Vol. 45, No. 4, pp. 890-904, 2007. https://doi.org/10.1109/TGRS.2006.888865
- J. W. Lee, G. G. Choi and K. Na, "Feature Extraction Using High Range Resolution Profiles for Estimating the Number of Targets," Proc. SPIE Security + Defence Conference, Vol. 10794, 2018.
- B. C. Flores, A. Ugarte, and V. Kreinovich, "Choice of an Entropy-Like Function for Range-Doppler Processing," in Automatic Object Recognition III. International Society for Optics and Photonics, Vol. 1960, pp. 47-57, 1993.
- X. Li, G. Liu, and J. Ni, “Autofocusing of ISAR Images based on Entropy Minimization,” IEEE Transactions on Aerospace and Electronic Systems, Vol. 35, No. 4, pp. 1240-1252, 1999. https://doi.org/10.1109/7.805442
- O. R. Vincent and O. Folorunso, "A Descriptive Algorithm for Sobel Image Edge Detection," in Proceedings of Informing Science & IT Education Conference(InSITE), Vol. 40, pp. 97-107, 2009.
- J. W. Lee and J. H. Shin, "A Study on Modeling for Motion of Chaff Cloud," KIMST Annual Conference Proceedings, No. 148, pp. 308-309, 2016.