共查询到16条相似文献,搜索用时 156 毫秒
1.
2.
3.
4.
5.
6.
7.
针对接收阵列射频通道间增益不一致以及系统感知模型与目标角度信息失配等情况下,基于压缩感知(Compressive Sensing,CS)的多目标波达方向(Direction of Arrival,DOA)估计方法性能下降的问题,提出了一种新的单通道CS-DOA估计方法.引入一种单通道阵列体制,并建立系统模型失配时的DOA稀疏感知模型;将丹茨格(Dantzig Selector,DS)算法和遗传算法相结合,分别对目标角度信息矢量和系统模型失配误差进行交替迭代优化.该方法有效克服了常见CS-DOA方法无法抑制系统模型失配误差的问题,避免了射频通道间增益不一致对DOA估计性能的影响.仿真结果表明:该方法性能优于传统DOA估计算法,能够对任意相关性信号进行有效DOA估计,具有更高的角度分辨力和估计精度. 相似文献
8.
9.
10.
天线阵元的位置误差会影响天线阵元所接收到信号的相位。基于特征值分解的高分辨率波达方向(DOA)估计算法对信号的相位误差非常敏感。针对多输入多输出(MIMO)阵列,本文基于遗传算法,利用自校正思想,构造一个对不同方向空间谱值进行加权求和的自适应权函数,结合MUSIC方法,构建个体适应度函数,实现了MIMO阵列阵元位置误差与DOA的联合在线估计。仿真结果表明该方法进行DOA估计的同时,还可以完成阵列位置误差的在线估计与校正,提高了系统参数估计的鲁棒性。 相似文献
11.
12.
阵元幅相、互耦误差对阵列DOA估计性能产生了严重影响。文章结合误差模型,提出了一种结合校正矩阵特殊结构设定约束条件的误差校正算法,进行的约束设定能够有效避免重复的无益估计过程,减少了运算复杂度,方法简便、快捷,且无需知道辅助源的精确位置信息便能够精确估计出误差参数及来波方位,最后通过仿真试验说明了算法的有效性。 相似文献
13.
14.
15.
Direction-of-arrival (DOA) estimation using an array of sensors relies on an accurate characterization of the array manifold. In the absence of characterization errors, established techniques like MUSIC can be shown to perform well both theoretically and in simulation. However, in the presence of unknown sensor and/or source characteristics, the performance of most methods degrades significantly. We consider the problem of estimating gain and phase errors of an array of sensors whose physical positions are known. Our algorithm assumes that the gain and phase characteristics of the sensors are independent of DOA and employs multiple calibration sources with known DOA's. It differs from other algorithms in that the signal wavelengths are unknown. A least-squares formulation of the problem is then shown to be NP-complete, implying that an efficient solution is unlikely to exist. An implicit, enumerative technique is used to obtain the exact solution. For the special case of collinear sensors, we further show that an inherent ambiguity in the model prevents exact phase characterization unless the wavelength of one calibration source is assumed known. A theorem is presented relating the error in DOA to the difference between the assumed and true wavelengths of this calibration source. Simulation results are presented for both noncollinear and collinear arrays 相似文献