基于FPGA的二次雷达多目标应答信号处理

Secondary Surveillance Radar Multi-targets Responsive Signal Processing Based on FPGA

多目标应答信号处理技术是提高二次监视雷达(SSR)系统处理能力的关键。提出了一种基于FPGA设计的多目标处理技术,利用单脉冲二次雷达天线的和差关系、目标应答信号脉冲幅度的一致性以及数字STC脉冲处理,能在高密度应答中快速准确地提取出交叠目标的框架脉冲和信息脉冲,同时有效地剔除混扰、窜扰等干扰引起的虚假目标。实测结果证明,该方法能够快速处理出4个交叠的目标,有效提高了SSR系统的应答信号处理能力。

Multi-target respondsive signal processing is the key to improve the processing capability in secondary surveillance radar（ SSR ）systems. In this paper a technique based on FPGA about multi-target responsive signal processing is presented. By use of the Sum to difference relation of mono-pulse SSR antenna, coherence of responsive signal pulse amplitude and digital STC pulse processing, the frame-pulse and info-pulse of multi-target can be picked up fast and accurately in high density replies, and also can availably eliminate illusive targets caused by internal interference existing in the SSR system. The test results indicate that this solution can process four overlapped targets fast and improve responsive signal processing capability in SSR systems.