北斗三号B1C信号中Weil码在DSP中生成研究

The study of generation of Weil code used in B1C signal from DSP

Weil码具有良好的相关性能和相对灵活的可选序列长度,在我国北斗三号的B1C信号中得到应用,同时在GPSⅢ和欧洲Galileo系统中也得到应用。Weil码在Matlab中实现简单,但在DSP中由于存储方式原因,实现却相对复杂。如果按比特计算,则运算量会非常大。文中提出按字计算和分段实现的方法,将整个计算过程分为三段,先在每一段中拼接生成整字,再按字计算。通过试验证明该方法正确,具有计算速度快、占用存储空间小等优点。

Weil code has good correlation performance and relatively flexible optional sequence length.It has been used in B1C signal of BDS 3 in China,and in GPS Ⅲ and Galileo system in Europe.Weil code is easy to implement in Matlab,but it is relatively complex to implement in DSP due to the storage mode.If it is measured in BIT,the amount of computation will be large.In this paper,the method of word-based computing and segment-based implementation is proposed.The whole computing process is divided into three segments,with each segment forming the word,and then calculated on word base.The experiment shows that the method is correct and has the advantages of fast calculation speed and small storage space.