摘要
天线阵元的位置误差会影响其所接收到信号的相位,无人机机翼上安装的共型天线在飞行中由于各种振动因素会产生阵元位置误差,严重影响对地目标的检测和成像。针对无人机机翼振动问题建立三种不同的振动模型,包括强制振动模型、随机初始位移误差模型和随机振动模型,以及各种组合模型,从简单到复杂来研究各种振动对方位估计的影响及补偿技术。建立了弯曲模态、强制振动及各种随机振动的数学模型,并根据这些数学模型对强制振动带来的相位变化进行补偿,并针对常规波束形成算法、MVDR波束形成算法、对角加载的MVDR算法,分别讨论振动在补偿前后对这三种方位估计算法的影响。仿真结果表明在各种振动条件问题中,对角加载的MVDR算法波束估计性能最稳健。
The position errors of antenna array elements introduced by vibrations affect the received signal phrase and direction of arrival （DOA）. Conformal antennas which are widely integrated into the wing skin of Unmanned Aerial Vehicles （UAVs） for synthesis aperture imaging （SAR） and target detection, are subject to unsteady aerodynamic loads. As a consequence, the position and orientation of the phase array antenna were changed. Three different vibration models, including forced vibration model, random initial displacement error model, random vibrating model and their combination, were discussed, and their effect to DOA estimation and compensation technique were analyzed. Several algorithms, such as conventional beamforming, minimum variance distortionless response （MVDR） beamfoming, and diagonal loading MVDR algorithm, were used to verify the effect of vibration before and after compensation to array antenna. Simulation results demonstrate that diagonal loading MVDR algorithms have the best DOA estimation performance for different vibration cases.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2014年第1期137-145,共9页
Journal of System Simulation
基金
西北工业大学基础研究基金JCY20130109
关键词
位置误差
MVDR算法
对角加载MVDR算法
振动
补偿技术
position error
MVDR algorithm
diagonal loading MVDR algorithm
vibration
compensation technology
