摘要
在硬件电路中,低通滤波器在滤波的同时使输入信号产生非线性相位偏移。针对这个问题,提出基于比例积分控制器的恒定相移低通滤波电路。该电路利用低通滤波器与比例积分控制器级联,设置低通滤波器的极点值等于比例积分控制器积分时间常数的倒数,且低通滤波器的阶数与比例积分控制器的个数相同,从而使信号经过低通滤波器与比例积分控制器的相位偏移的和为恒定值。理论分析与仿真表明,与全通滤波器和零相移滤波器实现线性相移或恒定相移相比,提出的电路计算简单,误差较小,并且容易实现。
The low-pass filter could make the input signal suffer nonlinear phase shift while it is working in the hardware circuit. To solve the problem, this paper presented a low-pass circuit of constant phase shift based on proportional integral controller, which was achieved by cascade of low-pass filter and proportional integral con- troller, pole value of low-pass filter was set equal to the reciprocal of proportional integral controller integral time constant, and the orders of low-pass filter was the same as the number of proportional integral controllers, when the signal passes through the filter and the controller, phase shift of which was equal to constant value. Result of theoretical analysis and simulation showed that the circuit was of less calculation amount, less error and easier to implement, compared with the all-pass filter and zero-phase-shift filter, the circuit achieved a con- stant linear phase shift or constant phase shift.
出处
《探测与控制学报》
CSCD
北大核心
2013年第5期69-73,共5页
Journal of Detection & Control
基金
国家自然科学基金项目资助(61004127)
关键词
电路
滤波
低通
相移
circuit
filtering
low pass
phase shift
