Journal of Systems Engineering and Electronics ›› 2011, Vol. 33 ›› Issue (10): 2179-2183.doi: 10.3969/j.issn.1001-506X.2011.10.07

• 电子技术 • 上一篇    下一篇

通道幅相不一致的实时校正方法

司伟建1,2, 初萍1, 孙圣和2   

  1. 1. 哈尔滨工程大学信息与通信工程学院, 黑龙江 哈尔滨 150001;
    2. 哈尔滨工业大学电气工程及自动化学院, 黑龙江 哈尔滨 150001
  • 出版日期:2011-10-15 发布日期:2010-01-03

Real-time calibration method for channel amplitude-phase mismatch

SI Wei-jian1,2, CHU Ping1, SUN Sheng-he2   

  1. 1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China;
    2. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
  • Online:2011-10-15 Published:2010-01-03

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。

Abstract:

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 proposed 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 dynamically 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.