High Resolution Angle Parameter Estimation for Bistatic EMVS-MIMO Radar Based on a New Designed Array
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摘要: 针对双基地EMVS-MIMO雷达角度参数估计问题，该文通过设计新的发射阵列和接收阵列来实现对双基地EMVS-MIMO雷达角度参数估计精度的提升。相比于半波长的均匀线性发射阵列和接收阵列，所设计的新型阵列能够实现发射端和接收端阵列孔径的扩展。并且，为了避免发射角和接收角的角度参数额外配对过程，该文利用平行因子算法来实现发射角和接收角的角度参数自动配对。同时，相应的发射方位角、发射俯仰角、发射极化角、发射极化相位差和接收方位角、接收俯仰角、接收极化角以及接收极化相位差也是自动配对的。通过利用平行因子算法多次迭代之后得到的方向加载矩阵，对应于发射角和接收角的精粗估计的旋转不变关系可以从方向加载矩阵中进行相应的提取。因此，高分辨的发射角和接收角可以通过精粗估计的结合来实现。相比于当前算法，所提算法具有自动参数配对特性以及较低的计算复杂度。仿真实验表明所提算法具有较高的估计精度。Abstract: A new transmit and receive array in bistatic ElectroMagnetic Vector Sensor Multiple-Input Multiple-Output (EMVS-MIMO) radar system is designed to improve the angle parameter estimation accuracy. Compared with the bistatic EMVS-MIMO radar equipped with half -wavelength spaced uniform linear arrays both in the transmitter and receiver, the new designed transmit and receive array can further enhance the array aperture. And, automatically paired angle parameter matching process for 2D DOD and 2D DOA can be obtained with the aid of the parallel factor trilinear alternating least square algorithm. Meanwhile, the corresponding elevation angle, azimuth angle, polarization angle and polarization phase difference both for transmitter and receiver are also automatically paired. Then, the loading matrices corresponding to transmit and receive array can be obtained by using the parallel factor trilinear alternating least square algorithm. And, high-accuracy and low-accuracy direction sine estimation can be determined by extracting the rotation invariance relationship from the obtained loading matrices. Thus, high resolution angle parameter estimation can be located by combining the high-accuracy estimated results and low-accuracy estimated results. Furthermore, the proposed method can provide automatically paired angle parameter matching process and lower computation complexity than state-of-the-art methods. Simulation results are carried out to verify the excellent angle parameter estimation performance of the proposed method.
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