交叉极化干扰对阵列雷达测角影响研究

Research on the Influence of Cross-Polarization Jamming on Angle Measurement of Array Radar

为研究复杂电子对抗环境下雷达性能受干扰情况,本文研究了交叉极化干扰对极化融合单脉冲阵列雷达测角性能的影响。首先,阐述了阵列雷达极化融合单脉冲测角方法。然后,理论分析了交叉极化干扰对极化融合单脉冲阵列雷达测角性能的影响,从数学上证明了该干扰方法可带来极化融合测角的误差项,导致测角精度下降。最后,提出了采用辛格函数导数的变体函数对子阵交叉极化方向图进行模拟,并在此基础上对极化阵列雷达的测角性能进行了交叉极化干扰仿真,得到了测角精度随交叉极化干扰强度变化曲线和测角性能下降率与目标回波极化比的关系。研究表明,交叉极化干扰会导致阵列雷达测角性能下降,交叉极化干扰分量与目标回波共极化分量相近时对测角影响较大,并且,目标回波的极化比越小,即目标的交叉极化分量越小,雷达受干扰越明显,测角性能下降越大,性能降低10%左右。

In order to analyze the impact of jamming on radar performance under complex electronic countermeasures, the impact of cross-polarization jamming on the angle measurement performance of the polarization-intergration mono-pulse array radar is studied in this paper.Firstly, the polarization-intergration mono-pulse angle measurement method of array radar is described.Then, theoretical analysis of cross-polarization jamming on the array radar angle measurement performance is done, which justifies the cross-polarization jamming method can bring angle measuring error term leading to the decrease of the angle measuring accuracy. Finally, a sinc function derivative variation function is presented, subsidiary, to simulate the array of cross-polarization direction graph.On this base, the angle measurement performance of polarized array radar is simulated under cross-polarization jamming.The angle measuring accuracy changing with cross-polarization jamming intensity curve and angle measuring performance degradation rate with the target echo os polarization ratio relationship are obtained.The simulation results show that cross-polarization jamming can lead to the decrease of radar angle performance, and it has a great influence on the angle measurement when the cross-polarization jamming component is similar to the polarization component of the target echo.In addition, the smaller the polarization ratio of the target echo is, that is, the smaller the cross-polarization component of the target, the more obvious the radar is interfered, and the greater the decrease of the angle measurement is. The angle measuring proformance is reduced by about 10%.