ویژگی داخل پالسی سیگنال ساطع کننده
Abstract
1-Introduction
2-EMD Analysis
3-Normalized Energy Entropy Feature Extraction
4-Conclusion
5-Acknowledgments
6-References
Abstract
Aiming at this problem that the analysis of instantaneous frequency for radar emitter signal(RES), based on empirical mode decomposition(EMD) the intra-pulse feature extraction method for RES is studied. Using empirical mode decomposition the normalized energy entropy (NeEn) feature is extracted. The experiment result displays that if the signal-to-noise ratio is greater than 12 dB, the feature shows only small fluctuations.
Introduction
The radar emitter signal is a typical non-stationary signal, and the relatively straightforward analysis of non-stationary signals requires the use of localized fundamental quantities and basis functions. The instantaneous frequency(IF) is a concept that has been proposed very early, and it is a basic quantity with locality. The IF is defined under the concept of derivative of the phase for the resolved signal, but this definition often produces some erroneous results in actual signal analysis. Aiming at this problem, the feature extraction method of intra-pulse for RES based on EMD is studied.