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说明以最小二乘拟合方法作零差指示的设计思想,并导出在自增控放大系统中的拟合曲线数学模型;讨论了其工程设计方法及近似误差。实验证明这种以软件为主的零差指示器具有良好的分辨率和准确性。
The design idea of zero difference indication based on the least squares fitting method is introduced, and the mathematical model of the fitted curve in the amplification system is deduced. The engineering design method and approximate error are discussed. Experiments show that this software-based homodyne indicator has good resolution and accuracy.