论文部分内容阅读
提出一种简易有效且便于实际系统应用的圆阵幅相误差校正方法.在圆阵中心放置一发射校准信号辅助天线,通过计算比较各阵元接收信号与基准阵元通道接收信号的互相关系数即可得到各阵元通道的相对幅相误差闭式解,计算量较小,估计精度高.1×104次统计独立仿真分析了该方法在不同信噪比和不同快拍数情况下的性能,在校准信号信噪比25dB,采样数400的情况下,幅度估计误差为0.03,相位估计误差为0.5°.对有幅相误差的8元圆阵进行了二维测向实验,经所提方法校正后的阵列测向方位角误差为0.3°、俯仰角误差为1.6°,仿真及实验结果验证了该校准方法的有效性.
A simple and effective error correction method for circular array amplitude is proposed, which is simple and effective and can be applied to practical system.A calibration signal auxiliary antenna is placed in the center of the circular array. By calculating and comparing the cross correlation coefficients between each array received signal and the reference array element channel received signal, The closed-form solution of the relative amplitude and phase error of each array element channel can be obtained, the calculation amount is small and the estimation accuracy is high. The performance of this method under different signal-to-noise ratios and different snapshot numbers is analyzed by 1 × 104 statistical independent simulations , In the case of 25dB signal-to-noise ratio of the calibration signal and 400 samples, the amplitude estimation error is 0.03 and the phase estimation error is 0.5 °. The azimuth error of the array after correction was 0.3 ° and the pitch angle error was 1.6 °. The simulation and experimental results verify the effectiveness of the calibration method.