Real-Time Frequency-Tracking Method Based on Interpolated Kalman Filter Using Vibration and Surface Noise

Table 1

Frequency measurement accuracy of signals generated by the standard vibration exciter (Hz).

Frequency	FFT	KF	WT	SDFT	IKF	Frequency	FFT	KF	WT	SDFT	IKF
20	0	0	1.0E-1	1.0E-3	1.5E-3	20.2	0.2	0.2	8.0E-3	1.1E-3	2.3E-3
30	0	0	8.6E-2	3.2E-3	3.1E-3	30.3	0.3	0.3	1.7E-2	3.3E-3	4.4E-3
40	0	0	2.5E-1	2.9E-3	6.4E-3	40.7	0.7	0.7	3.7E-2	4.8E-3	7.2E-3
50	0	0	7.1E-2	6.7E-3	7.3E-3	52.3	0.3	0.3	6.5E-1	6.1E-3	7.9E-3
60	0	0	3.1E-1	8.3E-3	8.1E-3	61.3	0.7	1.3	4.6E-2	8.8E-3	9.2E-3
75	1	1	9.4E-2	7.9E-3	8.8E-3	75.3	0.7	1.3	2.2E-1	8.9E-3	9.9E-3
80	0	0	4.4E-1	7.1E-3	8.9E-3	80.3	0.3	0.3	7.0E-1	1.0E-3	1.1E-2
97	1	1	5.2E-1	8.8E-3	9.8E-3	97.7	0.3	1.7	8.3E-2	9.9E-3	1.1E-2
100	0	0	4.9E-1	9.6E-3	9.5E-3	102.7	0.7	0.7	5.3E-1	1.2E-2	1.2E-2
120	0	0	6.9E-1	9.9E-3	9.9E-3	122.3	0.3	0.3	7.5E-2	1.2E-2	1.2E-2