中文摘要：

采用平面坐标测量的水面目标跟踪系统,在现有的将目标视为质点的跟踪算法下,如不增加其他先验信息,很难进一步改善目标运动参数的估计精度。基于工程应用,考虑水面舰船的尺寸参数并将其建模为椭圆形目标,利用成熟的图像处理技术获取椭圆目标的尺寸参数。并提出一种基于椭圆目标跟踪的非线性运动参数估计算法;同时从理论上分析了应用中不同目标尺寸参数精度下目标运动参数估计的Cramer-Rao下界（CRLB）.数字仿真分析和初步实测结果表明椭圆形水面目标跟踪的工程可行性,且椭圆目标跟踪系统较传统质点目标跟踪系统收敛速度加快,运动参数估计精度提高。

英文摘要：

Target tracking performance of surface particle target tracking system for position measurement of traditional two-dimensional coordinates is hardly improved on condition that no extra prior information is added.Based on engineering application,a ship was modeled as an elliptical target by considering the dimensions of the surface target,and the shape parameters of elliptical target were attained by a mature image processing technology.Meanwhile,an algorithm for estimating the motion parameters of elliptical target based on nonlinear measurements was presented;and the Cramer-Rao low bound（CRLB） of motion parameter estimation was analyzed for the different parameters of target shape.Simulation analysis and preliminary results show that the elliptical target tracking is feasible,the elliptical target tracking system converges faster than the particle one,and the accuracy of motion parameter estimation of the elliptical target system is higher than that of the particle system.