FDA对测向时差组合定位的欺骗研究

Research on Deception Based on Direction Finding Time Difference Positioning System of FDA

针对雷达电子战中,敌方无源探测雷达通过接收干扰机信号实现测向定位,威胁我方干扰机安全的问题,提出一种基于频率分集阵列(FDA)的测向时差组合定位欺骗技术。首先在建立FDA阵列模型的基础上,通过欧拉公式得到采用非线性频控函数的FDA阵列因子及相位方向图;之后推导了FDA阵列作用于干涉仪测得的信号到达角β;之后,以虚拟干扰机位置与真实位置的欧氏距离D为评价指标,分析欺骗效果。仿真结果表明,阵列载频位于L、S波段的欺骗效果优于X波段。在一定参数范围内,D值随着阵列阵元总数、阵列载频的增加而增大。远场条件下,采用正弦及对数频控函数的FDA阵列在消除方向图耦合的同时,其定位欺骗的D值取值在6~10 km之间。

Aimed at the problems that in the radar electronic warfare,the enemy’s passive detection radar can realize the direction finding and positioning by receiving the jammer signals to threaten the safety of our jammer,this paper proposes a direction-based cross-location spoofing technique based on Frequency Divers Array(FDA).Based on the establishment of the FDA array model,the FDA array factor and phase patternby using nonlinear frequency offset are obtained by Euler’s formula.The signal arrival angleβmeasured by the FDA array on the interferometer is then derived.Then,the Euclidean distance D of the virtual jammer position and the real position is used as an evaluation index to analyze the fraud effect.The simulation results show that the spoofing effect of the array carrier frequency in the L and S bands is better than that of the X-band.Within a certain parameter range,the D value increases with the increase of the total numberof array elements and the array carrier frequency.Under condition of the far field condition,the FDA array with sinusoidal and logarithmic frequency offset can eliminate the coupling of the beam-pattern,simultaneously the D value of the positioning fraud is in between 6~10 km.