南京大学学报（自然科学版）Issue(2)：148-153,6.DOI:10.13232/j.cnki.jnju.2014.02.005
基于微多普勒的锥体目标进动和结构参数估计
Precession and structural parameter estimation of cone-shaped target based on the micro-Doppler
摘要
Abstract
The discrimination of warhead and decoys is one of the main technological bottlenecks in ballistic missile defense system,which means the success or failure of the anti-missile system to some extent.Micro-motion is commonly referred to small mechanical vibrations or rotation in addition to mass translation which may induce additional frequency modulation on the received target echoed signal,called micro-Doppler effect.The characteristic of micro-motion is academically considered as one of the most effective characteristics in ballistic midcourse target recognition.The extraction of the micro-motion characteristics offers new measures for target recognition in ballistic missile defense.And in the many recognition methods,the one based on the micro-motion plays the most important part.Using target micro-motion characteristics for target detection and recognition is a hot topic in radar community recently.This paper obj ects at the midcourse rotational symmetrical cone-shaped target.In this paper,under the background of missile confrontation,the location and model of echo of the two scattering centers on the target are derived and the model of precession of cone-shaped target with sliding scattering center is constructed according to the scattering center theory.The explicit relationship among the structure parameters and the micro-Doppler parameters is analyzed and then the analytical expressions of micro-Doppler are derived.The time frequency distribution-Hough(TFD)transformation is a commonly used method for the parametric estimation of frequency modulated signal,its core being the accurate signal modeling and to design the algorithm of extracting the time-frequency curve according to the frequency changes of signal.In the paper,the parametric estimation method by using the tool of TFD-Hough transformation is studied.Then a joint parameter estimation method based on TFD-Hough Transform is proposed,under which precession and structural parameters are estimated according to the syn-thesized micro-Doppler parameters of two scattering centers and joint solutions of their parameter space.Simulation results show that the time-frequency curves of micro-Doppler echo coincide with the analytical expression.The joint parameter estimation method introduced can be referred to accurate estimation of precession and structural parameters such as precession angle,precession frequency,cone height,conical bottom radius,etc.关键词
目标识别/滑动散射中心/微多普勒/参数估计/时频分布/霍夫变换Key words
target recognition/sliding scattering center/micro-Doppler/parameter estimation/time frequency distribution-hough transformation引用本文复制引用
王兆云,张兴敢,柏业超..基于微多普勒的锥体目标进动和结构参数估计[J].南京大学学报（自然科学版）,2014,(2):148-153,6.基金项目
江苏省产学研前瞻性联合研究项目(BY2012187) （BY2012187）
