S模式应答机中频数字信号处理方法研究

模式应答机在二次雷达系统中担任着重要的角色。结合工程实际，提出一种基于 FPGA 的 S 模式应答机中频数字信号处理方法，针对 S 模式特殊信号格式和突发询问的特点，给出了一种快速载波频率捕获的 DPSK 解调算法，提高了 S 模式应答机的灵敏度，降低了硬件使用资源。

Study on Medium Frequency Signal Processing Method of S Mode Transponder

The S mode transponder plays an important role in secondary radar system. Combined with the engineering practice, this paper presents a medium frequency signal processing method based on FPGA. According to the special signal format of S mode and the characteristics of burst query, a fast carrier head acquisition algorithm is presented, which improves the sensitivity of S mode transponder and reduces the use resource of hardware.