But the time lag measurement obtained between the current time measurement and state estimation all saved, and repeat the calculation, which consume large amounts of storage space and computation time, it is difficult to guarantee real-time system.

But there is a need to measure the moment will lag between the time the current measurement and state, it is estimated that full preservation and duplication of computing, and thus consume large amounts of storage space and computing time system, it is difficult to guarantee the real-time.

But needs to lag preserves completely the time which the survey obtains to the current time between survey and the state estimation, also carries on the repetition the computation, thus consumes the massive storage space and the operation time, guarantees the system with difficulty timeliness.

But require time to the current time lag measurement between measurements State estimation and save all of them, and repeated calculations, which consume a large amount of storage space and computing time, difficult to maintain systems of real time.

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