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介绍了循环平稳信号的理论及其自相关函数和谱特性,论述了如何在信号处理中对信号进行循环自相关函数分析来判别信号的循环平稳性。由于感应同步器存在加工工艺误差以及安装上的误差,导致了转台测角系统误差,对误差信号的二阶统计量进行分析证明它为非平稳信号,为小波重构测角系统误差提供了理论依据。采用db3小波对测角系统误差信号进行分解与重构,重构标准差小于测角系统精度,重构信号满足精度要求,可以用重构信号代替原误差信号进行计算机误差补偿。
The theory of cyclostationary signal and its autocorrelation function and spectral characteristics are introduced. It is discussed how to analyze the cyclic autocorrelation function of signal in signal processing to judge the cyclostationarity of signal. Because of the existence of machining process error and installation error of the induction synchronizer, the error of the measurement system of the turntable is caused. The second-order statistics of the error signal is analyzed to prove it is a non-stationary signal, which provides a theory for the error reconstruction of the goniometry system in accordance with. The db3 wavelet is used to decompose and reconstruct the system error signal. The reconstruction standard deviation is less than the accuracy of the angle measurement system. The reconstructed signal can meet the accuracy requirements. The reconstructed signal can be used to replace the original error signal to compensate the computer error.