一种天波雷达SCIT-IAA舰船目标检测方法

A skywave OTHR SCIT-IAA ship target detection method

针对短相干积累时间(SCIT)下一阶海杂波展宽遮蔽大中型舰船目标的问题,提出一种天波雷达SCIT迭代自适应(SCIT-IAA)舰船目标检测方法.该方法首先对回波进行预处理,获得导频矩阵、初始功率谱;然后计算回波的协方差矩阵,并把协方差矩阵的逆作为加权矩阵,利用加权最小二乘估计回波各频点的幅度;最后通过循环迭代的方式更新功率谱直至满足要求,无需建立参数模型.仿真分析和实测数据处理结果表明,该方法提高了短时回波的多普勒分辨率,可检测出海杂波边缘的大中型舰船目标.

Aiming at the problem that the next stage of sea clutter expansion can obscure large and medium-sized ship targets in short coherent integration time(SCIT),this paper proposes a skywave over-the-horizon rada(OTHR)SCIT iterative adaptive approach(SCIT-IAA)ship target detection method.The method preprocesses the echo first to obtain the pilot matrix and the initial power spectrum.Then the covariance matrix of the echo is calculated,and the inverse of the covariance matrix is taken as the weighted matrix,with the amplitude of each frequency point to be estimated by weighted least square.Finally,the power spectrum is updated through cyclic iteration until it meets the requirements,without the need to establish a parameter model.Simulation analyses and data processing results show that the proposed method improves the Doppler resolution of short-time echo and can detect large and medium-sized ship targets at the edge of sea clutter.