The S mode reply information includes pre-synchronization pulse and PPM original data.
模式应答信息包括前同步脉冲与PPM调制数据。
A frame synchronization detect circuit is designed based on the synchronization state machine using FPGA, and this circuit has functions of pre-protect, rear-protect and timing of the receiver.
采用FPGA设计了一种基于同步状态机的帧同步检测电路，具有帧同步的前方保护和后方保护以及接收端的定时功能。
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