摘要
对于宽带数字阵列雷达,传统的数字波束形成算法需要预知精确的期望及干扰信号角度,微小的角度估计偏差往往会带来波束性能的急剧下降.针对这个问题,提出了一种基于改进贝叶斯聚焦的宽带自适应波束形成算法.该算法假设期望信号方向满足高斯分布,干扰信号方向满足均匀分布,在此基础上计算宽带聚焦矩阵和数字阵列自适应权重.分析了原贝叶斯聚焦不能用于差波束的原因,介绍了如何将所提改进方法用于自适应单脉冲系统进行高精度测角.仿真实验证明了该算法的正确性和有效性.
For wideband digital array radar,it is necessary for the conventional digital beamforming methods to obtain the direction of arrivial（DOA） of the signal and interference precisely.Little estimating error causes large focusing error,which may also affect the feasibility of the whole system.To solve the problem mentioned above,a new wideband adaptive digital beam forming algorithm based on improved Bayesian focusing method is proposed.It is assumed that the probability functions of DOAs of the interested signal and interferences are uniform and obey the Gaussian distribution respectively.Then the adaptive weight vector and focusing matrix are calculated.The reason why the conventional method cannot be used in different beams is analyzed in details.The procedure of the adaptive monopusle method using the proposed algorithm is also given in this paper.Simulation results verify the correctness and effectiveness of the proposed algorithm.
出处
《电波科学学报》
EI
CSCD
北大核心
2013年第2期237-248,共12页
Chinese Journal of Radio Science
基金
国家自然科学基金资助项目(No.11273017)
