为了使数据可靠地传输，链路设计中往往盲目加大发射机功率，提高天线增益来提高系统的余量。
For the purpose of reliable transmission, the system margin is increased blindly through enhancing the transmitter power or the antenna gain in link design.
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.
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