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
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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。Abstract: 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.
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Sinsky A I, Wang P C P. Error analysis of a quadrature coherent detector processor. IEEE Trans on AES 1974, AES-10(11): 880-883.[2]Curchbill F E et al. The correction of I and Q errors in a coherent processor. IEEE Trans. on AES 1981, AES-17(1): 131-137. -
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