CAJ | 학술논문

真假目标识别是弹道导弹防御的一大技术瓶颈，目标识别的正确与否在一定程度上决定了反导系统的成败。微动引起的雷达可观测量微多普勒特征包含了目标的运动、尺寸、形状等大量信息，因此微动特征是当前学术界公认的弹道中段目标识别的有效特征之一，对微动特征的提取为弹道导弹防御目标识别提供了新的解决手段。该文以旋转对称锥形目标为研究对象，根据散射中心理论以及攻防对抗条件，推导了目标两个等效散射中心的位置与回波模型，建立了基于滑动型散射中心的锥体目标进动模型。分析了目标的结构参数与雷达回波微多普勒参数的显式关系，推导出微多普勒随时间变化的解析表达式。结合弹道中段目标识别等应用背景，提出了基于 TFD-Hough变换的联合参数估计的方法。该方法综合两个散射中心的微多普勒参数，联合求解二者的参数空间，对进动和结构参数进行估计。仿真结果表明目标回波的微多普勒时频曲线与解析微多普勒曲线吻合，所提联合参数估计方法可准确估计进动角、进动频率、锥体高度、锥底半径等进动和结构参数。
진가목표식별시탄도도탄방어적일대기술병경，목표식별적정학여부재일정정도상결정료반도계통적성패。미동인기적뢰체가관측량미다보륵특정포함료목표적운동、척촌、형상등대량신식，인차미동특정시당전학술계공인적탄도중단목표식별적유효특정지일，대미동특정적제취위탄도도탄방어목표식별제공료신적해결수단。해문이선전대칭추형목표위연구대상，근거산사중심이론이급공방대항조건，추도료목표량개등효산사중심적위치여회파모형，건립료기우활동형산사중심적추체목표진동모형。분석료목표적결구삼수여뢰체회파미다보륵삼수적현식관계，추도출미다보륵수시간변화적해석표체식。결합탄도중단목표식별등응용배경，제출료기우 TFD-Hough변환적연합삼수고계적방법。해방법종합량개산사중심적미다보륵삼수，연합구해이자적삼수공간，대진동화결구삼수진행고계。방진결과표명목표회파적미다보륵시빈곡선여해석미다보륵곡선문합，소제연합삼수고계방법가준학고계진동각、진동빈솔、추체고도、추저반경등진동화결구삼수。
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.