本文依据功率传输方程，导出了在失配条件下镜像法测量增益的简化公式，分析了失配对增益测量的影响。
A simplified formula of the gain measurement by the image method is derived according to the power transmissions equation. The effect of mismatch on the gain measurement is analysed.
本文分析了子阵d BF在理想通道条件及通道失配情况下的方向性函数，给出了其和差波束方向性函数特性。
We analyze the pattern function of DBF in subarray under the ideal condition and with channel mismatch, and give the pattern functions of sum and difference beam.
同时我们还发现，在一定条件下，晶体损耗能使振幅失配的高斯光束演化成匹配的高斯光束，并最终演化成稳定的明孤波。
It is found that the loss in the crystal can make a mismatched incident Gaussian beam evolve to a matched one, and then become to a steady-state bright soliton.
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