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针对硬件帧同步器解码可能丢失整帧数据这一问题 ,提出一种软件解码方法 ,并对实时处理的可行性进行了分析。首先将接收到的PCM数据流进行位同步 ,然后经过一双口RAM作为缓冲 ,直接送入微机进行实时帧同步码粗同步。在所有遥测数据都接收完之后 ,利用模糊算法和最优选择实现帧同步码精确同步 ,从而得到不丢失帧的遥测解码数据。该软件用VC6 .0得到了实现。
Aiming at the problem that the hardware frame synchronizer may lose the entire frame data, a software decoding method is proposed and the feasibility of real-time processing is analyzed. First, the received PCM data stream bit synchronization, and then through a dual-port RAM as a buffer, directly into the computer for real-time frame synchronization code coarse synchronization. After all the telemetry data has been received, the frame synchronization code is accurately synchronized using the fuzzy algorithm and the optimal selection, so as to obtain the telemetry decoded data of the lost frame. The software was implemented with VC6.0.