Based on analyzing the sources of measurement errors, the correction methods of the errors are introduced and error models of two port calibration are provided.

在对网络分析仪的测量误差来源进行分析的基础上，介绍了误差的主要校准方法，同时给出了二端口校正的误差模型。

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If reciprocity and symmetry exist for passive two port networks of linear time invariant under zero intial condition, the circuit parameters will have some important characters.

对于线性非时变的无源二端口网络，在零初始条件下，若存在互易性及对称性，则其电路参数具有一定的特殊性。

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The main steps and related techniques of the method are introduced, and the simulation models and analysis of simulation results for two port transportation systems are given as well.

本文介绍了这一方法的主要步骤和所采用的技术，并结合两个港口运输系统的研究给出了有关的模拟模型和分析结果。

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