传统的自适应波束形成器对各类型的阵列误差较为敏感尤其是在较大的波达方向(Direction of Arrival,DOA)误差存在的情况下,阵列的输出信干噪比严重下降.为了解决这个问题,文中提出了一种新的具有自适应可调误差半径的鲁棒波束形成器.每...传统的自适应波束形成器对各类型的阵列误差较为敏感尤其是在较大的波达方向(Direction of Arrival,DOA)误差存在的情况下,阵列的输出信干噪比严重下降.为了解决这个问题,文中提出了一种新的具有自适应可调误差半径的鲁棒波束形成器.每一步迭代都是以经典的鲁棒Capon波束形成器为基础,且使用的误差不确定度都是依据子空间投影定理推导出的一个二次约束二次规划问题的最优解.由于估计出的导向矢量不确定度均小于传统自适应波束形成器中使用的误差量,因此,阵列的输出性能得以提高.此外,为了能够扩展算法的适用性,引入了可变椭圆不确定集来同时处理多重误差因素.最终的实验结果证明了算法的正确性和有效性.展开更多
The design and analysis of special type beam former, the Butler matrix, toachieve orthogonal beam-forming networks is presented in this paper. A 4 X 4 microstrip planar arrayantenna is assumed to simulate a 4 X 4 Butl...The design and analysis of special type beam former, the Butler matrix, toachieve orthogonal beam-forming networks is presented in this paper. A 4 X 4 microstrip planar arrayantenna is assumed to simulate a 4 X 4 Butler matrix to demonstrate orthogonal beam forming andbeam steering. The dimensions of rectangular patches in the planar array are chosen according to theDolph-Chebyshev current distribution in order to minimize the side-lobe level ratio for a givenvalue of beamwidth. The simulations are carried out using an antenna design and analysis softwarePCAAD. It is shown that orthogonal beams can be formed to cover about 163° angle with a constantbeam crossover level and high directivity.展开更多
文摘传统的自适应波束形成器对各类型的阵列误差较为敏感尤其是在较大的波达方向(Direction of Arrival,DOA)误差存在的情况下,阵列的输出信干噪比严重下降.为了解决这个问题,文中提出了一种新的具有自适应可调误差半径的鲁棒波束形成器.每一步迭代都是以经典的鲁棒Capon波束形成器为基础,且使用的误差不确定度都是依据子空间投影定理推导出的一个二次约束二次规划问题的最优解.由于估计出的导向矢量不确定度均小于传统自适应波束形成器中使用的误差量,因此,阵列的输出性能得以提高.此外,为了能够扩展算法的适用性,引入了可变椭圆不确定集来同时处理多重误差因素.最终的实验结果证明了算法的正确性和有效性.
文摘The design and analysis of special type beam former, the Butler matrix, toachieve orthogonal beam-forming networks is presented in this paper. A 4 X 4 microstrip planar arrayantenna is assumed to simulate a 4 X 4 Butler matrix to demonstrate orthogonal beam forming andbeam steering. The dimensions of rectangular patches in the planar array are chosen according to theDolph-Chebyshev current distribution in order to minimize the side-lobe level ratio for a givenvalue of beamwidth. The simulations are carried out using an antenna design and analysis softwarePCAAD. It is shown that orthogonal beams can be formed to cover about 163° angle with a constantbeam crossover level and high directivity.
