摘要
针对空间谱估计算法性能对通道幅相不一致敏感的问题,根据实际测向系统接收通道的特点,提出了利用自检信号进行实时校正的方法,将整个通道的校正分为天线到接收通道之间的无源器件预校正和接收通道的实时校正两个部分,先利用0°入射信号和自检信号的接收数据计算得到预校正矩阵,在测向过程中利用自检信号对接收通道进行实时校正。Matlab仿真结果表明实时校正方法可以动态校正通道的幅相不一致误差并且有利于提高MUSIC算法的分辨力,实测数据也表明实时校正方法可以动态的校正通道幅相不一致误差达到提高测向精度的目的。
To solve the problem that the property of spatial spectrum estimation algorithms is sensitive to array channel amplitude-phase mismatch, a real-time calibration method based on self-checking signal is pro- posed according to the characteristic of actual receiving channel. The whole channel calibration is divided into two parts： the pre-calibration of passive devices between antennas and receiving channels and the real-time calibration of receiving channels. At first, it can get the pre-calibration matrix by setting a signal which has direction of arrival of 0°. Then, it can realize real-time calibration using self-checking signal during the process of direction finding. Simulation results of Matlab prove that the proposed real-time calibration method can dynami- cally calibrate the channel amplitude-phase mismatch and it is helpful to prompt the solve ability of MUSIC algorithm. The experimental result in actual direction finding system show that it can calibrate amplitude-phase mismatch real-timely and get higher direction finding precision.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2011年第10期2179-2183,共5页
Systems Engineering and Electronics
基金
黑龙江省教育厅科学技术研究项目基金(11544025)资助课题
关键词
测向系统
实时校正
幅相不一致
自检信号
MUSIC算法
direction finding system
real-time calibration
amplitude-phase mismatch
selfchecking sig-nal
MUSIC algorithm
