作为信号源周期性的发射信号，周期为一秒，所发信号波形为先是LFM波接着CW脉冲，连接DA模块使用。(As the signal source, the periodically transmitted signal has a period of one second, and the signal waveform is first LFM wave and then CW pulse, which is connected to the DA module.)

该程序使用Verilog语言产生LFM信号(The program uses Verilog language to generate LFM signals.)