滑动频率估计算法在微波测量液位中的应用

在微波测量液位的系统中,正弦信号的频率估计是实现液位测量的关键.比较并分析了离散FFT变换的两种正弦信号频率估计方法:Rife比值法和三角形法,提出了一种滑动频率估计方法,通过实时确定比例因子,得到了滑动频谱校正算法.实验结果表明,该方法频率估计精度较高,估计性能优于单一的Rife法、三角形法,适合于低信噪比条件下的实...

Sliding frequency estimation algorithm in the application of microwave liquid level measurement

In the microwave liquid level measurement system,the frequency estimation of sine signal is the key to achieve liquid level measurement.The article compares sinusoidal frequency estimation methods of the discrete FFT transform,Rife ratio method and triangle method and proposed a sliding frequency estimation method.Through real-timely determining the scale factor,the sliding spectrum correction algorithm has been achieved.Experimental results show the new algorithm has high estimation accuracy, its estimation performance is better than single Rife method or triangle method,and it is suitable for real-time signal processing under low SNR.