Research on Telemetry Vibration Signal Processing by Hilbert-Huang Transform

The vibration signal of telemetry in missile weapon test has non-linear and non-stationary on the feature segments, so the method of the data processing by Hilbert-Huang transform (HHT) combined with wavelet de-noising is proposed in this paper. At first, zero drift and trend terms must be removed from the signal. Secondly, the intrinsic mode functions (IMF) can be got by empirical mode decomposition (EMD) and wavelet de-noising for each IMF. At last, the time-frequency spectrum is obtained by Hilbert transform. The results of the data processing tests following the above flow show that the time-frequency spectrum has higher time-frequency resolution.