基于脉压处理和脉冲积累的压制干扰效果评估

Effect Evaluation of Suppressive Jamming Based on Pulse Compression Processing&Pulse Accumulation

压制干扰效果可以通过进入雷达接收机的信号的干信比来评估,但雷达内部处理会引起目标回波和干扰信号功率的变化,需要定量分析信号处理对干信比的影响才能正确评估压制干扰效果。首先引入了干信比计算模型和不同方位上雷达接收天线增益的近似计算方法,然后分析了脉冲压缩匹配滤波对目标回波信号和干扰信号功率的影响,并对相参和非相参两种脉冲积累方式对目标信号和干扰信号功率的影响进行了计算,给出了脉压处理和脉冲积累修正下的干信比计算模型,最后采用雷达和干扰机的典型参数对新模型进行了仿真分析。仿真结果表明,脉冲压缩和脉冲积累会缩小有效干扰抑制区,脉冲压缩的影响效果明显高于脉冲积累,并且两种处理叠加后干扰抑制区的范围会剧烈削减。

Suppressive jamming effect can be evaluated by jam-to-signal ratio of the signal entering radar receiver,however target echo and jamming signal power will change after being processed in radar system,so the influence of signal processing on jam-to-signal ratio needs to be quantitatively analyzed for correctly evaluating the suppressive jam effect.Firstly,jam-to-signal ratio mathematical model as well as approximate calculation method of the radar receving antenna gain at different directions are introduced,then the influence of pulse compression matched filtering on target echo power and jam signal power is analyzed,and the influence of both coherent and non coherent pulse accumulation ways on target signal and jam signal power is calculated,and jam-to-signal ratio calculating model modified by pulse compression and pulse accumulation is given,finally the simulation analysis is performed by using the typical parameter of radar and jammer.The simulation result shows that the pulse compression and pulse accumulation will reduce the effective jam suppressive area,while the influence of pulse compression is obviously more than that of pulse accumulation,and the jam suppressive area will be sharply reduced after two processing method are used together.