通过分析同相、正交通道误差对正交解调性能的影响，确定了滤波器最佳设计准则。

The effect of in-phase and quadrature channel errors on digital quadrature demodulation is analyzed and an optimal digital filter design method is selected.

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当滤波器失谐量较大时，得到同相波长转换结果，此时交叉相位调制(XPM)占主导作用，而滤波器起到提取啁啾信息的作用。

And the non-inverted conversion is obtained by large filter detuning, which is used to extract the frequency chirps, and in this condition the cross phase modulation (XPM) is dominant.

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