微多普勒效應在飛機目標分類中的應用研究
[Abstract]:Aircraft, as one of the main combat tools in modern warfare, plays a key role in the victory of war. The micromotion of rotating parts on the aircraft produces periodic frequency modulation of radar echo, which makes different aircraft targets exhibit different micro-Doppler characteristics. It has important guiding significance and practical value for the research of aircraft target classification technology. Based on the analysis of the mechanism of micro-Doppler effect, this paper aims to study the feature extraction method in aircraft target classification. The main work is as follows: first, for the helicopter, propeller aircraft and jet aircraft, the ideal parameter model of the modulation echo of the rotating parts is derived, and the tail rotor and the number of engines are studied respectively. The effects of blade angle, pulse repetition frequency of radar parameters, beam-dwell time and emission wavelength on the modulation echo of three kinds of aircraft rotating components. From the point of view of inter-class difference and intra-class aggregation, the second moment, waveform entropy, amplitude relative and phase relative feature of target classification are extracted, and the feature vectors of target classification are compared and extracted, which include the second moment in time domain, the waveform entropy in time domain, the relative amplitude and the relative value in phase. Support vector machine classifier is used to classify three kinds of aircraft. The experimental results show that the extracted feature vectors can effectively classify aircraft when the SNR is high, and the classification effect increases with the increase of SNR. These four features are simple and easy to implement, and the computational complexity is also low. So it is beneficial to project realization. Second, because the extraction of jet engine modulation features requires at least a complete target rotation period to be included in the echo, it is usually difficult to satisfy this condition when the radar is operating in a scanning state, so in this case, In this paper, a method for estimating micro-Doppler parameters of scanning radar targets based on partial periodic data is proposed. Firstly, the time-frequency analysis technique is used to transform the signal into time-frequency domain, and the partial periodic micro-Doppler signal is extracted from the time-frequency domain of the echo signal. The microDoppler signal can be expressed in the form of sinusoidal signal. By using the properties of sinusoidal function, the rotational frequency and amplitude of the target can be estimated, and the rotation radius of the target can be estimated. As the inherent characteristic of the target, the rotational radius reflects the structure information and motion characteristics of the target, and provides a powerful basis for target recognition and classification, and describes the moving details of the rotating target more completely. The simulation results show that the proposed method has higher accuracy and lower complexity than the Hough transform method. The effectiveness and robustness of the proposed method are verified by using the measured data.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:E926.3;TN957.51
【共引文獻】
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