Effects of Complicated Measurement Environments to Correlation of Observational Data

摘要

Correlation analysis of outer-trajectory data measured by equipments onboard spacecraft TT&C(tracking, telemetry and control) ship shows: by using differential methods to make stationary correction for measurement data, its tendency can be eliminated and stationary requirements can be satisfied; partial correlation function reflects the correlation between ,t s x x ,which has no change after differential correction, it reflects the correlation in nature; therefore, partial correlation function should be mainly based on when studying correlation of measurement data. Processing results show: all the correlated steps of slant range R are more than that of other measurement elements of the same shipboard equipments in a same mission, measuring 30 steps or so, correlated time of about 3 seconds, which shows R has a strong correlation, say, slant range value at a certain time is liable to be affected and restricted by that measured at previous time; the correlated steps of other elements are usually near 15 steps, i.e., correlated time is about 1.5 seconds.