滤波器的相频特性对像质影响的仿真

在本文中，我们利用计算机真的方法，研究了多种椭圆低通滤波器和巴特沃思滤波器的相频特性对象质的影响。     

数字频率特性测试仪在教学中的典型应用

数字频率特性测试仪应用DSP和CPLD技术,具有低频范围宽的特性.实验教学中采用数字频率特性测试仪,对有源四端网络频率特性进行了测试,得出特性曲线.     

捷联惯导系统中加速度计的时延补偿研究

In view of the phase shift characteristic inconsisteny between gyros and accelerometers in actual SINS (Strapdown Inertial Navigation System), it’s found that non synchronization velocity errors are considerable under SINS angular motion. Through SINS systemic test, a simple and convenient way to identify the accelerometer time delay parameter is proposed. In this way, a rolling test in gravity fields is designed and the relations between accelerometer time delay parameter and the system’s velocity error are obtained. Moreover, two kinds of methods for non synchronization velocity error compensation are given: one is the time delay extrapolation based on the transfer function model of accelerometer and the other is the velocity error direct compensation based on SINS velocity update algorithm. Finally, by using fiber optic gyro SINS, some experiments are carried out and the results verify that the navigation system’s accuracy is improved effectively and the theoretical analysis is correct.     

滤波器的相频特性对像质影响的仿真

利用计算机仿真的方法,研究了椭圆低通滤波器和Butterworth滤波器的相频特性对像质的影响。这种影响主要有边缘退化、分辨率损失、产生新的干扰条纹和几何畸变以及多波段图像配准精度降低等。     

数字频率特性测试仪在教学中的典型应用

数字频率特性测试仪应用DSP和CPLD技术,具有低频范围宽的特性。实验教学中采用数字频率特性测试仪,对有源四端网络频率特性进行了测试,得出特性曲线。     

振动传感器的相位特性测量

本文描述用激光干涉的方法测量机械振动的幅值及相位,并由此测量振动传感器灵敏度的幅频及相频特性,重点是相频特性,特别是反正切函数的计算方法。