说明：  ex9_12 二相编码信号的脉压处理，13位巴克码用于雷达的二相编码脉冲压缩中，由于巴克码具有好的自相关函数，所以其脉压结果很好
(BPSK ex9_12 pulse pressure signal processing, 13 Barker Code for the two-phase coded radar pulse compression, as a result of Barker codes have good auto-correlation function, so its a very good pulse pressure results)