On MIMO Radar Subarrayed Transmit Beamforming
On MIMO Radar Subarrayed Transmit Beamforming
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DOI：
10.1109/tsp.2011.2179540
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发表时间：
2012-04
影响因子：
5.4
通讯作者：
D. Wilcox;M. Sellathurai
中科院分区：
文献类型：
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作者：
D. Wilcox;M. Sellathurai
最近文献中提出了多输入多输出 (MIMO) 雷达方案，将发射阵列划分为子阵列，以结合相控阵和 MIMO 雷达技术的优点。在这项工作中，我们利用这种架构显着简化了传输过程，其中优化了 MIMO 雷达阵列的协方差矩阵，以改善目标参数估计的 Cramér-Rao 界限 (CRB)。研究了规则子阵列发射孔径的MIMO有效阵列，给出了获得填充有效孔径的必要条件，这对于保持无模糊、低旁瓣波束方向图具有重要意义。子阵列发射方法的性能根据目标参数估计的 CRB 进行评估，并考虑应用于子阵列的波束形成器的优化以最小化 CRB。正如预期的那样，子阵列传输方案的 CRB 对于全分集传输来说不是最优的，但使用这里开发的迭代波束空间算法可以在一小部分时间内解决。
Multiple-input-multiple-output (MIMO) radar schemes whereby the transmit array is partitioned into subarrays have recently been proposed in the literature to combine advantages of phased array and MIMO radar technology. In this work, we utilize this architecture to significantly simplify a transmit procedure in which the covariance matrix across the MIMO radar array is optimized to improve the Cramér-Rao bound (CRB) on target parameter estimation. The MIMO effective array for regular subarrayed transmit apertures is studied, and necessary conditions to obtain a filled effective aperture are presented, which is important for maintaining nonambiguous, low sidelobe beampatterns. The performance of the subarrayed transmit approach is evaluated in terms of the CRB on target parameter estimation, and the optimisation of the beamformer applied to the subarrays to minimize the CRB is considered. The subarrayed transmit scheme is found to have a CRB which is suboptimal to the full diversity transmission, as expected, but is solvable in a small fraction of the time using an iterative beamspace algorithm developed here.