通过对可观测性能分析，得出了这样的结论：仅用伪距和伪距变化率为观测量的组合系统对姿态角误差的可观测性较差。
Observability analysis shows that the integration system, in which only GPS pseudo range and delta pseudo range are the observable, can not assure favorable observability of the attitude error angles.
系统误差估计是雷达组网融合跟踪系统的重要环节，而可观测度又是决定误差估计效果的关键因素。
Systematic error estimation is an important process for data fusion and target tracking in radar networking system, and observability is the key factor which determines the estimation accuracy.
通过对INS系统可观测性进行分析，得出增加不同种类的外部导航信息观测量将有效提高INS误差修正能力的结论。
By the observed capability analysis of INS, adding more kinds of external navigational information the integrated navigation system can promote the capability of INS error-correction.
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