Signal Nonstationary Degree Evaluation Method Based on Moving Statistics Theory

Table 1

Comparison of the applicable scope of the nonstationary degree evaluation method.

Characteristic
Method	Theoretical basis	Integrality	Locality	Time domain	Frequency domain
Autocorrelation function	●	●	●	●	○
Unit root test	●	●	○	●	○
Information entropy method	○	●	○	●	○
Recurrence plot	●	●	●	●	○
Nonlinear cross prediction method	●	●	●	●	○
Crossing-zero rate	○	●	●	●	●
Hurst exponent	●	●	●	●	○
HHT nonstationary degree	○	●	●	●	●
Moving zero-crossing rate	○	●	●	●	●
Moving Hurst exponent	●	●	●	●	○
Moving statistics	●	●	●	●	●

● indicates that it has the corresponding performance and ○ indicates that it does not have the corresponding performance.