旁瓣消隐系统检测损失问题研究

雷达通常采用旁瓣消隐系统来抑制从旁瓣进入的脉冲式干扰,但SLB系统在抑制旁瓣干扰的同时,也会带来检测损失问题。针对这一问题,在建立SLB系统模型的基础上,对造成SLB系统检测损失的原理进行了研究,给出了SLB系统的检测损失概率的定义,推导了基于非中心χ2分布的旁瓣消隐雷达检测损失概率计算公式,得出了影响SLB系统检测损失概率的主要因素有雷达检测门限、天线增益参数、消隐门限,平均信噪比的结论,并通过理论分析和仿真实验,具体分析了消隐门限不同取值对SLB系统检测损失概率的影响,确定了消隐门限值的最优解,能在保证对干扰抑制的同时降低SLB系统的检测损失概率,最后通过仿真验证了结论的重要性。

Research on Detection-loss Probability of SLB System

In radar usually the side-lobe blanking system is adopted to eliminate pulse-type interference from side-lobe. But SLB system also results in detection-loss. In order to solve this problem, this paper establishes a model of SLB system, studies the cause of the detection-loss resulting from SLB system, gives the definition for the detection-loss probability and derives the equation of the detection-loss probability based on non-central chi-square distribution. The equation illustrates that the radar detection threshold, antenna gain parameters, blanking threshold, mean SNR all can influence the detection-loss probability. The theoretical analysis and simulation proves that different blanking thresholds will result in different outcomes. At last, fix on an optimum blanking threshold is fixed on to reduce the probability and eliminate interference well, and a simulation is done to verify the importance of the conclusion.