基于发射波束域-平行因子分析的MIMO雷达收发角度估计

摘要

该文提出了基于发射波束域-平行因子分析的双基地MIMO雷达收发角度估计方法.针对传统MIMO雷达发射功率分散的问题,将发射功率聚集范围与期望发射方向矢量相结合,提出了发射波束加权矩阵的优化准则,并转化为二阶锥规划形式,通过内点法求出其数值解,进而利用平行因子分析(PARAFAC)算法估计出收发角度.仿真结果表明:离线设计得到的波束加权矩阵使发射功率聚集于感兴趣的目标空域,且近似服从均匀分布,因此,在发射功率和角度估计算法相同时,基于发射波束域的角度估计精度优于全向等功率发射时的角度估计精度.%A new algorithm to jointly estimate the DOD-DOA of bistatic MIMO radar is proposed based on transmit beamspace-parallel factor. For the problem of the power being transmitted dispersedly in traditional MIMO radar, the optimizing criterion for designing beam weight matrix is proposed combining the focus range of the transmit power with the desired transmitting steering vector. This constrained optimizing formula can be reformed to a standard Second Order Cone Programming (SOCP) fashion and be solved with interior-point method. Furthermore, the DODs and DOAs of target are estimated by using the PARAllel FACtor (PARAFAC) algorithm. The simulation results illustrate that: the beam weight matrix which can be designed off-line makes the transmitting power focus within the spatial sector of interesting targets. And the distribution of the transmitting power in that spatial sector is approximately uniform. Therefore, when the same angle estimation algorithm and the same transmit power are utilized, the transmit beamspace-based MIMO radar can perform better angular accuracy than the traditional MIMO radar.