A novel symbol synchronization is presented with frame synchronization of PPM. On the basis of analyzing frame sync code pattern and length, a PPM frame scheme is designed.
在分析帧同步码型和长度要求的基础上，设计了一种PP M帧结构，提出了利用帧同步来实现PPM符号同步的方法。
The bits of each successive 4-ary output symbol are then interleaved, producing an output bit-stream which has global and interleaved run-length constraints.
然后交错每个连续四进位输出符号的位，从而产生具有全局且交错的连串长度约束的输出比特流。
Otherwise, it should be checked from one known point to another with proportional anti-symbol allocation between closing error and the length of side.
否则，应从一已知点出发测至另一已知点以资校核，此时其闭合差应与导线边长成正比反符号进行分配。
Otherwise, it should be checked from one known point to another with proportional anti-symbol allocation between closing error and the length of side.
否则，应从一已知点出发测至另一已知点以资校核，此时其闭合差应与导线边长成正比反符号进行分配。
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