基于FPGA的S模式应答通信设计

Design of Mode-S Communication Based on FPGA

S模式应答信息包括前同步脉冲与PPM调制数据。在研究S模式应答信息特点与PPM调制原理的基础上,重点论述了脉冲发生器、PPM调制器、前同步脉冲检测及解调器几个模块的建模原理,并在FPGA中用VHDL编程实现了S模式应答信息的调制解调过程,得到了正确的仿真结果。最后,结合无线收发系统,通过实验证明了方法的正确性。

The S mode reply information includes pre -synchronization pulse and PPM original data. Based on studying the feature of S mode reply information and the principle of PPM modulation, the process of pulse generator, PPM modulator, the detection of pre-synchronization pulse block and PPM de -modulator were discussed, and then the whole was accomplished in FPGA. Finally, in combination with the radio communication system, the process was proved.