彈道導(dǎo)彈的微多普勒特征參數(shù)提取方法研究
[Abstract]:As a remote target detection tool, radar can measure the range, angle and velocity of moving target. With the continuous improvement of radar technology, modern radar has been extended to be used for target fine structure measurement and fine motion feature extraction for target recognition. However, due to the rapid development of target feature control technology in recent years, non-cooperative targets such as false targets, decoys and other non-cooperative targets can be imitated accurately, which makes the target recognition method based on traditional features lose its high efficiency. How to accurately identify non-cooperative targets in military defense has become one of the most important tasks in radar field. The frequency of radar wave is modulated by moving object, which causes the frequency of echo to deviate from the transmitting frequency. This phenomenon is called Doppler effect. If, in addition to the motion of the center of mass of an object, there are some small motions (fretting) in its own structural components, it will cause additional frequency modulation on the echo signal, forming a Doppler sideband associated with the target subject. This phenomenon is called the micro-Doppler effect. MicroDoppler features are the only unique features of an object that are different from other objects and represent fine frequency modulation generated by certain structural components of an object. It can be used as a new idea and method for ballistic missile target recognition with the help of the particularity of the object itself. In this paper, the background and significance of the subject and the development of ballistic missile target recognition are briefly introduced, and then some theoretical knowledge about radar micro-Doppler effect and its characteristics is introduced to pave the way for the development of the thesis. Then the models of different fretting forms (rotation, vibration, precession) of ballistic missile targets are established and analyzed in narrowband and wideband radar respectively. Then, the method of extracting fretting characteristic parameters of ballistic missile based on time frequency analysis is discussed. In this paper, the classification of time-frequency analysis method, the motion modeling of warhead target, the time-frequency characteristic analysis of radar echo, the method of extracting fretting characteristic parameters based on time-frequency analysis method and the simulation are described in detail. At the same time, the characteristic parameters of fretting are simulated and analyzed according to the variation of scattering point and signal-to-noise ratio (SNR). Finally, on the basis of a brief overview of the existing methods for extracting the fretting parameters of ballistic missiles, the cepstrum method and time-frequency method are used to simulate and compare them, and the advantages and disadvantages of the three methods are analyzed. It is proved that the time-frequency analysis method is relatively robust and reliable in ballistic missile target recognition, and it can extract the fretting characteristic parameters of the target.
【學(xué)位授予單位】:河南師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:E927;TN95
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