天线方向性误差对DOA估计影响及其校正

Effect of antenna directional error on DOA estimation and its calibration

天线阵元的方向性误差会导致基于特征值分解的DOA估计算法性能的下降,因此有必要对阵元方向性误差进行校正。首先建立了存在方向性误差情况下DOA估计的数学分析模型,提出利用空间平滑法和改进空间平滑法对方向性误差进行校正。仿真实验表明,方向性误差对DOA估计的影响主要表现在谱峰峰值的降低。空间平滑法和改进空间平滑法均可以有效地对方向性误差进行校正。

The directional error of antenna array element may cause performance degrading of DOA estimation algorithm based on eigenvalue decomposition. Thus it is necessary to correct the directional errors. The mathematical models for analyzing DOA estimation when there is directional error are established. It is put forward to use spatial smoothing technique and improved spatial smoothing technique for calibrating directional error. The computer simulation results demonstrate that the main effect of directional errors on DOA estimation is that it reduces the peak of spectrum. Spatial smoothing technique and improved spatial smoothing technique can calibrate the directional errors effectively.