Design of Mode-S Communication Based on FPGA
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.