航天测量船外测数据的复杂误差特性

The Statistics of Measurement Noise of the Instrumentation Ship

使用三次样条最小二乘拟合残差法研究了航天测量船外测数据误差的统计特性,分析了其误差的相关特性,建立了时序模型.研究结果表明,航天测量船外测数据误差具有强自相关性、非正态性、时变方差性和分段平稳性,其特性可以用高阶AR模型描述。

In this paper the statistics of measurement noise of the instrumentation ship was estimated. The cubic spline function was used to approximate the real signal of the measurement. The residuals of the least square estimation were modeled with time series analysis method. The analysis results of the real data were given. It showed the strong correlation, non-normality, time-varied variance and segmented stationarity of the noise of the instrumentation ship. The feature of the noise can be approximated by the higher order auto-regressive（AR） model.