摘要
本文首先给出了正弦信号干扰下的低通型频谱信号的采样定理,证明了带通信号干扰下的低通型频谱信号的采样定理。运用采样定理,针对控制系统中普遍存在的工频干扰问题,提出离散控制系统采样频率的确定不仅要考虑对象的特性,而且要同时考虑干扰的特性,防止控制系统主要的有效信息频段(低频段)内出现频谱混叠,为信号滤波提供有利条件。这种方法对系统设计已经完成,在调试运行过程中出现未预料到的工频干扰的处理提供了有力的理论支持。
After introducing the sampling theorem for low-pass signal with sine disturbance,the sampling theo-
rem for band-pass disturbed signal is proposed. Based on these sampling theorems,to overcome the influence from
industrial frequency in control system,this paper pointed out that the sampling frequency in discrete control sys-
tem is related to not only object property but also property of interference. To prevent the frequency spectrum
alias in the effective low frequency band of control system from the industrial frequency signal,and to offer good
condition for signal filtering,this method provides a theoretical support to processing the unexpected industrial
frequency interference.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2003年第z2期558-560,574,共4页
Chinese Journal of Scientific Instrument
关键词
工频干扰
频谱混叠
采样定理
Industrial frequency interference
Frequency spectrum alias
Sampling theorem
