基于PM算法的涡旋电磁波引信超分辨测向方法

PM based super-resolution method of azimuth detection for electromagnetic vortex wave fuze

为提高防空导弹无线电引信在低信噪比(SNR)背景下的测向精度,提出了基于传播算子算法(PM)的涡旋电磁波引信超分辨测向方法。通过相控均匀圆阵依次发射不同轨道角动量模态涡旋电磁波照射目标,基于多发单收(MISO)模型推导目标探测回波模型;通过对回波方程的近似变形构造接收信号矩阵;采用PM算法构造空间谱函数,进行谱峰搜索,实现对目标水平方位角的估计。对所提方法的有效性进行仿真验证,结果表明,所提方法可在低信噪比、少阵元情况下实现对目标的精确测向。

To improve the azimuth detection accuracy of air defense missile radio fuze at low signal-to-noise ratio(SNR)background,a super-resolution method of azimuth detection for electromagnetic vortex wave fuze based on propagator method(PM)is proposed.Vortex electromagnetic waves with different orbital angular momentum modes are sequentially emitted to irradiate the target by a phase-controlled uniform circular array,and the target echo mathematical model is derived based on the multiple-input single-output(MISO)model.The received signal matrix is constructed through the approximate deformation of the echo equation.Then,PM is used to construct the spatial spectrum function,and spectral peak searching is performed to estimate the target azimuth.The effectiveness of the proposed method is verified by simulation.Results show that the proposed method can accurately detect the azimuth of a target in the case of low SNR and few elements.