对算法进行了改进，在不增加计算量的情况下，实现了对频率变化的跟踪。

The improved algorithm can track frequency variation of the time-varying signal with no extra calculation burden.

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该格式具有形式简单，对网格的划分灵活，与传统格式相比不增加计算量等优点。

Compared with traditional schemes, the new scheme has simple form and its grid generation is very flexible and it also does not increase CPU time.

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特别是经过改进后，在一个完整的加密过程中，可以实现不增加计算量而快速提高加密强度。

Especially when it is improved, it can enhance the encryption intensity commendably but not increase too much computation degree in an integrated encryption processing.

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