基于长电偶极子和大磁圆环的新型电磁矢量传感器双基地多输入多输出雷达角度和极化参数联合估计

针对常规双基地电磁矢量传感器多输入多输出(multiple-input multiple-output,MIMO)雷达中短电偶极子(L/λ<0.1)和小磁环(2π(R/λ)<0.1)辐射效率不足问题,本文根据实际应用中电磁矢量传感器的有效长度来设计新型的发射电磁矢量传感器阵列和接收电磁矢量传感器阵列.首先,通过平行因子算法来实现对双基地MIMO雷达阵列接收数据空时特性的充分利用.这种处理过程能够实现发射俯仰角和接收俯仰角的自动参数配对.然后,针对归一化坡印亭矢量估计器在长电偶极子和大磁圆环约束下无法实现角度和极化参数有效测量的问题,对于利用平行因子算法得到的发射和接收加载矩阵采用新的盲估计算法来实现对角度参数和极化参数的高精度估计.所提出的盲估计算法在不需要电偶极子长度和磁环周长的先验信息的情况下能够有效地实现发射四维参数和接收四维参数的精确估计,且该算法估计得到的八维参数满足自动参数配对特性.最后,详细推导了长电偶极子和大磁圆环约束下双基地MIMO雷达中角度和极化参数估计性能的克拉美罗界.仿真实验表明,对于实际中长电偶极子和大磁圆环组成的新型电磁矢量传感器,本文所提算法具有良好的参数估计性能.通过理论分析和仿真实验结果可以发现,本文的研究工作能够进一步促进电磁矢量传感器在双基地MIMO雷达中的应用.

Joint angle and polarization parameter estimation for the new designed bistatic multiple-input multiple-output radar with long dipoles and large loops

In this paper,a new designed bistatic electromagnetic vector sensors multiple-input multiple-output radar with long dipoles and large loops is proposed to avoid the low inefficient electromagnetically radiation efficiency of original bistatic electromagnetic vector sensors multiple-input multiple-output radar with short dipoles(L/λ<0.1)and small loops(2π(R/λ)<0.1).The new transmitting and receiving sensors are designed based on the effective length of the electromagnetic vector sensor in practical engineering application.Firstly,the Parallel Factor trilinear alternating least square algorithm is proposed to make full use of the spatial-temporal tensor model for received data after matching filtering.And,the closed-form automatically paired two dimensional Direction of Departure and two dimensional Direction of Arrival can be obtained with the aid of the Parallel Factor trilinear alternating least square algorithm.Furthermore,due to the vector-cross-product Poynting-vector algorithm is failed in the condition of the new designed electromagnetic vector sensors with long dipoles and large loops,an efficient blind estimation method without requiring the prior knowledge of the dipoles’electric length L/λand loops’electric radius R/λis detailed derived to deal with the estimation of the transmitting azimuth angle,transmitting polarization angle,transmitting polarization phase difference,receiving azimuth angle,receiving polarization angle and receiving polarization phase difference.And,the estimated transmitting azimuth angle,transmitting polarization angle,transmitting polarization phase difference,receiving azimuth angle,receiving polarization angle and receiving polarization phase difference are also automatically paired without additional angle parameter pair matching process.Finally,the expression of the Cramer Rao Bound is detailed derived for the designed new bistatic electromagnetic vector sensors multiple-input multipleoutput radar.The detailed derived Cramer Rao Bound can provide a benchmark for angle parameter and polarization parameter estimation performance.Additionally,simulation results are conducted to verify the better angle parameter and polarization parameter estimation accuracy of the proposed method for the new designed bistatic electromagnetic vector sensors multiple-input multiple-output radar with long dipoles and large loops.Through theoretical analysis and simulation results,it is can be founded that the length of the electric dipole and the circumference of the loops should be suitable selected to guarantee a better estimation accuracy.Thus,the interesting work in this paper can further promote the engineering application of electromagnetic vector sensor in bistatic multiple-input multiple-output radar.