一种基于分离抑制比曲线的接收机IQ不平衡校准方法  

An IQ Imbalance Calibration Method Based on Separation Rejection Ratio Curves

作　　者：刘云生 程春悦 LIU Yunsheng;CHENG Chunyue(Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China)

机构地区：[1]北京无线电计量测试研究所,北京100039

出　　处：《宇航计测技术》2025年第1期20-25,共6页Journal of Astronautic Metrology and Measurement

摘　　要：本研究提出了一种边带分离接收机IQ通道幅相不平衡的新校准方法,该方法利用分离抑制比曲线系中不同曲线间抑制比偏差及曲线间增益不平衡变化信息构建方程组,并推导出求解过程,实现了仅需调整数字后端校准系数即可完成接收机幅相不平衡误差校准的目的。本研究基于该校准方法开展了MATLAB数值仿真实验,仿真结果表明,该方法能够实现超过80 dB的镜像抑制比,验证了校准方法的可行性与有效性。新方法解决了边带分离接收机传统校准方法需要在中频端口同时获取幅度和相位信息才能实现对接收机校准的缺点。This research presents a new calibration method for IQ channel amplitude and phase imbalance in a sideband separation receiver.In the new method,the equation set is established based on the rejection ratio difference and the information of gain imbalance between different curves in the separation rejection ratio curve cluster.Then,the solution process is derived,and the aim that calibrating the receivers only by adjusting the digital back-end calibration coefficient is accomplished.This study conducts MATLAB numerical simulation experiments based on the proposed calibration method.The simulation results demonstrate that the method achieves a separation rejection ratio exceeding 80 dB,thereby validating the feasibility and effectiveness of the calibration method.The new method solves the defect that the traditional calibration method of the sideband separation receiver needs to obtain both amplitude and phase information at the IF port in order to realize the calibration of the receiver.

关 键 词：超外差接收机 镜像抑制比 校准因数 

分 类 号：TN98[电子电信—信息与通信工程]