机载双基雷达3D-STAP杂波抑制方法
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摘要
机载双基雷达杂波空时分布具有严重的距离依赖性,即其分布随距离(俯仰角)的变化而变化,给杂波抑制带来困难,使传统的二维空时自适应处理(2D-STAP)性能变差。三维空时自适应处理(3D-STAP)利用俯仰维信息,将杂波谱分布由二维拓展至三维,通过在三维空间杂波谱分布的曲面上形成自适应凹口,来对杂波进行抑制。通过分析双基任意构型下的杂波在多普勒频率-水平空间频率-垂直空间频率三维空间中的分布特性,结合双基雷达体制特点,对传统3D-STAP算法进行了改进,使3D-STAP算法适用于双基情况,为双基雷达杂波抑制提供了一种新的思路。仿真表明,在典型双基构型下,与2D-STAP相比,该方法能使杂波脊附近的改善因子提高5dB左右,有效提高了杂波抑制能力,有利于低速目标的检测。
The space-time distribution of airborne bistatic radar clutter is of serious range dependence,that is,the distribution varies with the range or elevation angle,which degrades the performance of the conventional two-dimensional space-time adaptive processing(2D-STAP)and thus brings difficulties to clutter suppression.The three-dimensional space-time adaptive processing(3D-STAP)extends the distribution of the clutter spectrum from two dimensions to three dimensions by introducing the array elevation angle.Clutter is then suppressed by forming an adaptive notch on the entire 3D clutter plane.In this paper,3D-STAP in the monostatic radar is improved to the bistatic situation by analyzing the clutter distribution characteristics in the 3D space,that is,the Doppler frequency,the horizontal spatial frequency,and the vertical spatial frequency.It provides a novel idea for the bistatic radar clutter suppression.Simulation results show that the proposed method can improve the improvement factor near the clutter ridge by about 5 dB in the typical case compared with 2D-STAP,which effectively improves the performance of clutter suppression and is beneficial to the detection of low speed targets.
The space-time distribution of airborne bistatic radar clutter is of serious range dependence,that is,the distribution varies with the range or elevation angle,which degrades the performance of the conventional two-dimensional space-time adaptive processing(2D-STAP)and thus brings difficulties to clutter suppression.The three-dimensional space-time adaptive processing(3D-STAP)extends the distribution of the clutter spectrum from two dimensions to three dimensions by introducing the array elevation angle.Clutter is then suppressed by forming an adaptive notch on the entire 3D clutter plane.In this paper,3D-STAP in the monostatic radar is improved to the bistatic situation by analyzing the clutter distribution characteristics in the 3D space,that is,the Doppler frequency,the horizontal spatial frequency,and the vertical spatial frequency.It provides a novel idea for the bistatic radar clutter suppression.Simulation results show that the proposed method can improve the improvement factor near the clutter ridge by about 5 dB in the typical case compared with 2D-STAP,which effectively improves the performance of clutter suppression and is beneficial to the detection of low speed targets.
引文
[1]段锐.机载双基地雷达杂波仿真与抑制技术研究[D].成都:电子科技大学,2009.
[2]王永良,彭应宁.空时自适应信号处理[M].北京:清华大学出版社,2000:35-91.
[3]彭晓瑞,谢文冲,王永良.双基地机载雷达杂波建模及仿真分析[J].系统仿真学报,2011,23(2):257-261.
[4]黄忠言,袁俊泉,王力宝,等.天空双基地预警雷达非平稳杂波特性分析[J].空军预警学院学报,2015,29(4):235-238.
[5]周宇,陈展野,张林让,等.非均匀环境下利用雷达参数信息的STAP方法[J].电子科技大学学报,2016,46(6):905-910.
[6]冯为可,张永顺,于伟洋.基于杂波距离方位谱的机载非正侧MIMO雷达STAP方法[J].空军工程大学学报(自然科学版),2016,17(4):41-45.
[7]杨鹏程,吕晓德,刘宇,等.基于RDNLMS的机载外辐射源雷达杂波对消[J].电子与信息学报,2016,38(10):2488-2494.
[8]许华健,杨志伟,廖桂生,等.一种稳健的非均匀杂波协方差矩阵估计方法[J].电子与信息学报,2017,39(5):1036-1043.
[9]段克清,谢文冲,陈辉,等.基于俯仰维信息的机载雷达非均匀杂波抑制方法[J].电子学报,2011,39(3):585-590.
[10]吴旭姿,刘峥,谢荣.非正侧阵雷达距离模糊杂波抑制新方法[J].西安电子科技大学学报(自然科学版),2017,44(2):1-7.
[11]高飞,谢文冲,王永良.非均匀杂波环境3D-STAP方法研究[J].电子学报,2009,37(4):868-872.
[2]王永良,彭应宁.空时自适应信号处理[M].北京:清华大学出版社,2000:35-91.
[3]彭晓瑞,谢文冲,王永良.双基地机载雷达杂波建模及仿真分析[J].系统仿真学报,2011,23(2):257-261.
[4]黄忠言,袁俊泉,王力宝,等.天空双基地预警雷达非平稳杂波特性分析[J].空军预警学院学报,2015,29(4):235-238.
[5]周宇,陈展野,张林让,等.非均匀环境下利用雷达参数信息的STAP方法[J].电子科技大学学报,2016,46(6):905-910.
[6]冯为可,张永顺,于伟洋.基于杂波距离方位谱的机载非正侧MIMO雷达STAP方法[J].空军工程大学学报(自然科学版),2016,17(4):41-45.
[7]杨鹏程,吕晓德,刘宇,等.基于RDNLMS的机载外辐射源雷达杂波对消[J].电子与信息学报,2016,38(10):2488-2494.
[8]许华健,杨志伟,廖桂生,等.一种稳健的非均匀杂波协方差矩阵估计方法[J].电子与信息学报,2017,39(5):1036-1043.
[9]段克清,谢文冲,陈辉,等.基于俯仰维信息的机载雷达非均匀杂波抑制方法[J].电子学报,2011,39(3):585-590.
[10]吴旭姿,刘峥,谢荣.非正侧阵雷达距离模糊杂波抑制新方法[J].西安电子科技大学学报(自然科学版),2017,44(2):1-7.
[11]高飞,谢文冲,王永良.非均匀杂波环境3D-STAP方法研究[J].电子学报,2009,37(4):868-872.