摘要
针对任意发射波形合成结构影响下的机载相干MIMO雷达杂波自由度的估计问题。论文提出了一种机载相干MIMO雷达杂波自由度估计的构造法,该方法利用发射波形合成结构直接构造等效矩阵代替杂波协方差矩阵进行求秩。通过递推分解等效矩阵,提出并证明了一种杂波自由度快速估计准则,建立了机载相干MIMO雷达发射波形合成结构、阵列稀布构型与杂波自由度之间的定量关系。研究表明:该方法和准则能够准确预测任意发射波形合成结构下的机载MIMO雷达的杂波特征谱结构。该理论既保证了降秩STAP算法性能的最优又具有较小的计算量,并为最优发射波形合成方案和MIMO STAP算法的设计提供了依据。
This paper focuses on the problem of clutter rank estimation of coherent airborne MIMO radar with arbitrary transmitted waveform synthetic structures.A new construct method of clutter rank estimation for Multiple Input Multiple Output(MIMO) radar is presented.Clutter rank can be estimated by an equivalence matrix which is constructed by the waveform synthetic structures and sparse structure from the method,instead of the computation complicated direct decomposition of the Clutter Covariance Matrix(CCM).A simple and effective estimation rule of clutter rank is proposed and strict proofed based on the decomposition of the construct matrix.The quantitative relationship among the synthetic structures,sparse structure and Degree Of Freedom(DOF) of clutter is established,and the eigenspectrum structure of the clutter under arbitrary transmitted waveform synthetic structures can be obtained from the method and rule.Simulations also verify the accuracy of the method and rule.The proposed theory can be used to design an optimal synthetic structure and effective STAP algorithm.
出处
《电子与信息学报》
EI
CSCD
北大核心
2011年第9期2125-2131,共7页
Journal of Electronics & Information Technology
基金
国家杰出青年科学基金(60925005)
国家自然科学基金(60736009
60901071)资助课题
关键词
MIMO雷达
杂波协方差矩阵
发射波形合成结构
杂波自由度
Multiple Input Multiple Output(MIMO) radar
Clutter Covariance Matrix(CCM)
Transmitted waveform synthetic structure
Degree Of Freedom(DOF) of clutter
作者简介
通信作者:张西川xichuan102@163.com张西川:男,1984年生,博士生,研究方向为MIMO雷达技术、空时自适应信号处理.
张永顺:男,1961年生,教授,博士生导师,研究方向为MIMO雷达技术、自适应阵列处理.
谢文冲:男,1978年生,讲师,研究方向为空时自适应信号处理、自适应阵列处理.