单脉冲寻向天线和目标的一体化仿真及测角误差分析

发布时间：2018-03-04 20:29

本文选题：单脉冲天线　切入点：一体化仿真　出处：《电子学报》2014年09期 　论文类型：期刊论文

【摘要】：本文通过矩量法及其高效数值方法(MLFMA)对近距离目标——单脉冲收发天线的电磁互作用进行一体化数值仿真,定量研究了单脉冲天线的近场角度测量特性.在该近场模型中,目标散射近场的幅、相分布和同轴探针激励的喇叭单脉冲天线的辐射场(对应远场和波束)、接收端响应(对应远场差波束)均采用全波数值模拟获得.首先,计算单脉冲天线的辐射场并将其作为对目标照射的激励条件;接着,计算目标散射近场的空间分布;并计算出单脉冲天线所接收到的目标散射场;最后,使用幅值法和相位法计算出单脉冲天线近场测角角度,并在此基础上对近距离测角误差进行研究.在导弹目标算例中,将天线——目标一体化建模和天线口径面上散射近场的幅、相分布计算结果用于近距离条件下单脉冲天线测角误差的研究,并通过频率、距离的变化对测角精度做了对比分析;发现目标近场散射幅、相分布的非均匀性,是导致单脉冲天线近距离角度测量产生较显著的测角误差的主要原因;而频率较低时,测角误差较小.文中给出了物理解释,并提出近距离测向时借助于较低频信号的校正以降低测角误差的建议.
[Abstract]:In this paper, the method of moments and efficient numerical method (MLFMA) for short-range target electromagnetic single pulse antenna interaction integrated numerical simulation, near field angle measurement characteristics of the quantitative study of the monopulse antenna. In the near field model, target scattering near-field radiation field amplitude, phase distribution and coaxial probe the excitation horn monopulse antenna (corresponding to the far field and the beam), the receiver response (corresponding to the far field beam) are obtained by full wave numerical simulation. Firstly, calculate the radiation field of the monopulse antenna as the irradiation to target excitation conditions; then, calculating the spatial distribution of the near-field scattering; and calculate the scattering field of single pulse received by the antenna; finally, using the amplitude method and the phase is calculated by the method of single pulse antenna near field measurement angle, and based on the distance measurement error in missile target were studied. In the example, the antenna target modeling and antenna aperture near field scattering amplitude, phase distribution calculation result to close under the study of pulse antenna angle error, and the frequency of the change in distance to do a comparative analysis on the measurement accuracy; found near field scattering amplitude, non uniform phase distribution that is the main cause of monopulse antenna near distance angle measurement error produced significantly; while the low frequency, small angle measurement error. This paper presents the physical explanation, and puts forward the close direction finding by correcting the low-frequency signal to reduce the error is proposed.

【作者单位】：电子科技大学电子工程学院;
【基金】：国家自然科学基金项目(No.61231001)
【分类号】：TN957.2

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