VDES系统解调代码，ASM信息部分，QPSK调制，同步模块，以及SIC干扰消除。同步采用时频联合同步，准确率非常高。-VDES system demodulation code, ASM Information section, QPSK modulation, synchronization module, as well as SIC interference cancellation. Concomitant use frequency synchronization, the accu