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本文叙述了载波主群信号编码设备帧同步系统的设计。本设计采用分散型码组定帧比较方式。文中提供了具体电路,经实践证明电路布局合理,工作稳定可靠。对所采用同步方式的捕捉时间从理论上作了探讨,并导出一组实用计算公式。在这里第一次比较了三种不同帧同步方式的捕捉速度,以不同帧长度和帧码所占比例为参数划出了相应曲线进行了对比。从这里可以看出从捕捉时间的角度来考虑选取何种帧同步方式方为合适。结论:本设备的最大捕捉时间为31个T帧,即43μs。这个捕捉速度相对于载波主群以ms计的倒挽时间来看是足够快的了。
This article describes the design of the frame synchronization system of the main carrier signal coding equipment. This design uses a decentralized code set frame comparison method. The article provides a specific circuit, proven by the circuit layout is reasonable, stable and reliable. In this paper, we discuss theoretically the capture time of the adopted synchronization method and derive a set of practical calculation formulas. Here for the first time compared the capture speed of three different frame synchronization methods, the different frame length and the proportion of frame code as the parameter draw the corresponding curve were compared. From here we can see from the capture time to consider what kind of frame synchronization method is appropriate. Conclusion: The maximum capture time for this device is 31 T-frames, or 43μs. This capture speed relative to the main carrier of the carrier in ms count down time is fast enough.