一种实正弦信号的短时频率估计新方法

New Method of Short-time Frequency Estimation for Real Sinusoid

针对单频实正弦信号,分析了负频率成分对其频谱分析的影响。提出了一种实正弦信号的短时频率估计新方法。此方法基于把实信号转换为复解析信号的思想,把采样信号与它的90°相移组合成为一个单频复解析信号,然后对此复解析信号再做进一步的频谱分析,从而达到通过消除负频率影响来提高频率估计精度的目的。仿真结果验证了该方法的有效性。

Negative frequency contribution to frequency spectrum analysis of real sinusoid is analyzed. This paper presents a new method for short-time frequency estimation with negative frequency contribution eliminated. Based on the idea of transforming real sinusoid into complex signal, a single frequency complex sinusoid is generated by combining sampled signal and its 90 phase shifted version using this method. Frequency spectrum analysis is applied to the complex signal and then the aim, getting high accuracy frequency estimation by eliminating negative frequency contribution, is achieved. The simulation results show the effectiveness of the new method.