摘要
闪变噪声是无线电元件参量无规则变化引起的具有1/f话密度分布的噪声。这种噪声究竟是一种基本噪声还是一种数学表象,目前尚无定论。本文根据小波分析的基本原理,从信号的正交分解出发,初步从噪声信号中分离出产生闪变噪声的二分之一阶白嗓声。这种噪声分离方法经过陕西天文台国家授时中心实测数据的检验,而且与论述同一问题的其它文献中的方法有所不同,比较简单而切实可行。最后着重指出,闪变噪声是人们为了数学上的对称与完美而提出的,是传统的Fourier频谱分析的不足而产生的。
Flicker noise, which is of l/f type of spectrum, is caused by the irregular variation of the porameters of efortronic elements- It is not clear whether nicker noise is a kind of fundamental nOise or merely a mathematical idea. According to the wave1et theory, the 1/2th white noise which is the source of nicker noise is separated from the noise in an atomic clock. The methed is tested by us-ing the real data obtained in National Time Center. oUr method is different from those described in the papers avai1able on the same problem, which is simple and practicable. Flicker noise has been put forward mere1y for mathematical symmetry and completeness.
出处
《电波科学学报》
EI
CSCD
1997年第3期285-292,共8页
Chinese Journal of Radio Science
基金
国家自然科学基金
中国科学院天文委员会基金
关键词
小波分析
闪变噪声
原子钟
Wavelet theory, Flicker noise,1/2th White noise