二次雷达数字时间灵敏度控制处理的实现

如何有效剔除二次雷达系统中存在的干扰目标,提升设备的处理能力和效率,一直是系统最关注的方向之一。区别于传统信道接收机灵敏度简单调节的方法,提出了一种基于可编程门阵列（FPGA）实时计算目标应答信号强度的方法,通过设置有效应答信号范围,在应答脉冲处理阶段剔除时间灵敏度控制（STC）门限外由多径及异步等引起的干扰脉冲,减少了后期处理的信息数据,提升了系统效率和系统的多目标处理能力。通过外场实验验证,该方法能有效减少二次雷达系统内70%的虚警目标。

Implementation of sensitivity time control signal processing for secondary radar.

How to effectively eliminate interference targets existing in secondary radar and improve equipment processing capability and effectiveness is the orientation of system design concerned. Different from the traditional method of simple channel receiver sensitivity adjustment,this paper proposes a method of real-time calculation of the target response intensity based on Field Programmable Gate Array(FPGA). By setting the effective response signal range and eliminating the multipath and asynchronous interference pulses outside the Sensitivity Time Control(STC) threshold in reply pulse processing stage,the amount of information data is reduced,the system efficiency and multi-target processing capability are improved. Field test shows that this method can effectively reduce 70% of the false targets in the secondary radar systems.