利用Matlab生成GPS C/A 码的基带信号。

（1）产生卫星PRN 号码为“5”的一组C/A 码；

（2）循环生成25 页的导航数据，GPS 时间可填入一固定的已知数值；

（3）生成C/A 码扩频信号，每个C/A 码码片给出4 个采样数据；

（4）基带信号采用方波信号，电平为0 和1，占空比为50 ％，

不加入噪声，进一步生成某个特定的中频信号-The baseband signal is generated using Matlab GPS C/A code. (1) generate satellite PRN number " 5"　is a set of C/A code　(2) loop generates 25 navigation data, GPS time can be filled with a fixed known value　(3) generated C/A code spread spectrum signals, each C/A code chip sample data is given 4　(4) a baseband signal using a square wave signal with a level of 0 and a duty cycle of 50 , the noise was not added, and further generates a a specific frequency signal