Through ARIMA model and standardization, the nonstationary vibration series acquired in the field were transformed to stationary time series normally distributed.
将现场测得的非平稳振动序列通过ARIMA模型和标准化处理，转化成标准正态平稳时间序列。
2
Wigner distribution is introduced to analyze nonstationary signal, and an application example of validating the simulation model of a proximity fuze is given.
引入瞬时谱估计分析非平稳随机信号，以及应用于某型近炸引信数字仿真模型验证的一个实例。
3
The real signals have often non-stationary characteristic, so if we analyse these time series using AR model directly, we cant obtain design result.