Dissertation > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Scientific exploration equipment and instruments

The Technology Research on Aircraft Passive Sonic Detect and Identification

Author GeXinHong
Tutor BaiFengMing
School Changchun University of Science and Technology
Course Pattern Recognition and Intelligent Systems
Keywords Aircraft Passive audio detection Wavelet Analysis Feature Extraction Neural Networks
CLC V248
Type Master's thesis
Year 2007
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With the development of electronic jamming , anti-radiation missiles , stealth technology in modern warfare , as the main part of the airborne early warning system radar increasingly vulnerable to attack, passive audio detection technology is effective supplement of radar detection technology , it issued audio signal received battlefield target motion as the object of study , they do not signal , which has a strong hidden . Locate and identify aircraft passive audio detection system is divided into two sub-systems , this paper focuses on the identification subsystem . Firstly, the application of modern signal processing means to target audio signal wavelet transform feature extraction methods . Energy scale detail signals based on wavelet theory wavelet decomposition time domain based on the spectral characteristics of two kinds of battlefield targets audio feature extraction algorithm , using this algorithm to obtain a lower-dimensional feature vectors . And design the BP neural network and SOM neural network two classifications is . Target recognition experiments using helicopter II battlefield targets measured acoustic signal data , application of the wavelet analysis feature extraction techniques and classifiers identify classification , to examine their performance .

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