弱信号下的比特同步在GPS的接收机设计中是一个重点也是一个难点。
Under weak signal environments, bit synchronization is very important and difficult in GPS receiver design.
其中软件算法部分全部在主机CPU中实现，其中包括信道初始化，比特分配策略，符号同步，信道均衡，回波抵消，编码解码，FFT和IFFT等等。
The software algorithms are realized in host CPU, including channel parameters estimation, bit allocation, equalization, echo cancellation, FFT, IFFT, encoding, decoding, etc.
最后，分组标记符比特通过使用1的补码的同步标记替代。
Finally, the packet marker bit is replaced by the use of a one's complemented synchronization flag.
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