摘要
通过采用坐标变换推导出了自适应采样频率与信号瞬时频率之间的关系,利用二阶预测模型获得了信号瞬时频率的估算表达式,从而提出了一种基于信号模型的自适应采样方式;通过实验验证了该自适应采样方式的可行性;同时针对其计算量、收敛速度进行了分析,结果表明:基于信号模型的自适应采样无论是计算量还是收敛速度都有明显的改善。
According to transformation of coordinate, this paper deduces the relation between adaptive sampling frequency and signal instantaneous frequency. And, the expression of signal instantaneous frequency is defined on the basis of second-order prediction model. The experimentations of adaptive sampling were carried out with Matlab. It is shown that the sampling is effective. And the discussion, mainly in calculation task and convergence speed of this adaptive sampling method, shows an obvious improvement in comparison with other methods.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2009年第9期1918-1922,共5页
Chinese Journal of Scientific Instrument
关键词
频率估计
预测模型
自适应采样
frequency estimation
prediction model
adaptive sampling
