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.
