用DSP实现相参处理器I/Q通道幅相误差自动校正  

IMPLEMENTATION OF THE CORRECTOR OF ERRORS IN I & Q CHANNELS WITH DSP

作　　者：张兴敢[1] 朱兆达[1] 

机构地区：[1]南京航空航天大学电子工程系,南京210016

出　　处：《电子科学学刊》1999年第3期311-314,共4页

摘　　要：本文介绍I/Q通道误差自动校正的实现方法。校正网络由组合逻辑组成,可以校正同相支路和正交支路的幅相误差和直流偏移。校正系数由DSP根据相参测试信号算出。当幅度误差为0.1dB,相位误差为5°时,产生的相对镜像电平为-27dB。经过误差自动校正后,相对镜像电平下降到-52dB。This paper describes the implementation of the corrector of I & Q errors in coherent processor. The correcting network consists of combination logic circuit and it can correct the gain and phase imbalances and the bias errors of the in-phase and quadrature channels in coherent signal processing. The correcting coefficients are computed with DSP using a test signal. The image level without correction is about -27dB if the errors of gain and phase in the coherent processor are 0.1dB and 5° respectively. The experimental results show that the image level is reduced to -52dB from -27dB after correcting the errors.

关 键 词：数字信号处理器 相参信号处理 误差校正 DSP 

分 类 号：TN911.72[电子电信—通信与信息系统]