复杂运动目标雷达回波建模及参数估计  

Radar Echo Modulation and Parameters Estimation for Complex Motion Targets

作　　者：赵会宁[1] 贺思三[1] 龙戈农[1] 

机构地区：[1]空军工程大学防空反导学院,陕西西安710051

出　　处：《计算机仿真》2013年第11期6-10,共5页Computer Simulation

摘　　要：针对光学区等效散射中心散射系数是随角度变化这一问题,研究运动目标雷达回波优化建模。为提高对雷达回波描述的准确性,提出利用如下调幅-调相模型对复杂运动目标的雷达回波进行建模:采用Q阶多项式对调幅函数和包含高阶误差项的三阶多项式对相位进行建模。针对上述模型设计了估计算法:首先通过快速算法估计幅度与相位参数的初始值;然后利用最优化方法在初始值附近对信号的似然函数进行优化得到最终估计结果。仿真及实测数据分析结果表明,所提算法能有效的对模型参数进行估计;模型中所引入的高阶相位误差项能够对较小的、三阶以上的相位函数进行拟合,所引入的调幅多项式能对散射系数的变化进行拟合,为信号回波的准确建模提供了依据。The scattering cofficient of efficicent scattering centers in target varies as the line of sight in optical re- gion. This paper researched the problem of how to optimize the modeling of radar echo of complex motion target. To improve the accuracy of radar echo description, the following AM-FM function was proposes to model the radar ech- oes of complex moving targets ： the amplitudes of scattering centers were modeled with Q-order polynomial functions, the phases of scattering centers were modeled with cubic polynomial which includes higher-order error items. Also, a parameter estimation algorithm was proposed in this paper. Firstly, the rough parameters of amplitude and phase were estimated by a fast algorithm, and then the accurate estimation results were obtained by optimizing the maximum like- lihood estimation about the rough parameters. Simulation results show that the proposed algorithm can estimate the model parameters effectively; the introduced higher-order phase error term can fit a small higher-order phase error bigger than third-order and the AM function can fit the variation of scattering coefficient during observation interval. The proposed model provides a better description of radar echo.

关 键 词：复杂运动 调幅-调相函数 参数估计 

分 类 号：TN955[电子电信—信号与信息处理]