文中用逼近法和双线性变换法，设计了用于圆度测量的高斯数字逼近滤波器，并给出了零相移的递归滤波算法，计算量小，计算效率高，易于实现。
A series of Gaussian digital approximation filters used in roundness measurement were designed on the basis of approximation method and bilinear transformation.
基于移相载波调制，建立了变频器的非线性数学模型。
Based on the phase shift pulse width modulation technology, the mathematical non-linear model is developed.
采用了神经网络PID自适应控制方法，改善了 非线性，降低了环境干扰的影响，提高了压电式 移 相器的性能。
Neural network PID adaptive control scheme was used to enhance the performance of piezoelectric phase shifter by improving the nonlinear performance and depressing the interference of environment.
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