simulation of Synthetic Aperture radar where the transmitted signal is linear frequency modulated waveform

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.)