In the troposcatter communication at low rate or medium rate, a bit synchronization used by modem is usually extracted from the envelope that contains synchronization information.
在中低速散射通信中，调制解调器的位同步信号通常从含有同步信息的包络中提取。
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DM1 1 slot Data, Medium rate.
DM1 1时隙数据，中速。
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