分析了噪声背景下实谐波过程ARMA模型系数之间的对称性,并以此为约束条件加入ARMA谱估计方法的求解过程中,从而提出了一种改进的正弦信号频率估计方法.理论分析与计算机仿真表明,对于低信噪比条件下的正弦信号参量估计,这一算法的精度与稳定性都优于仅使用总体最小二乘法(SVD-TLS)的ARMA谱估计方法.-Analysis of real harmonic process noise background symmetry between ARMA model coefficients, and a

RS422总线的应用，在单片机与计算机或其他设备的数据交换中，此接口具有广泛的应用，包含仿真电路与keil程序文件-RS422 bus in microcontroller with computers or other devices for data exchange, this interface has a wide range of applications, including the simulation circuit Keil program files

单片机和计算机进行com口通信，基于PROTEUS仿真结果-SCM and computer com port communication, based PROTEUS simulation results