基于卡尔曼滤波的无线电台电磁干扰源定位方法研究

Research on radio electromagnetic interference source location method based on Kalman filter

针对传统电磁干扰源定位方法定位误差较大的问题,提出基于卡尔曼滤波的无线电台电磁干扰源定位方法。根据无线电台信号传输波束覆盖范围,确定干扰源经纬度定向,将卡尔曼滤波方法应用到干扰源定位过程中。通过状态方程离散化结果获取差分方程,估计该状态的滤波增益矩阵,计算预测误差的方差矩阵,递推计算得到状态估计值。依据能量压制度、时域吻合度、频域吻合度和空域吻合度分析干扰源定位要素,确定电台无线传输线路增益与干扰源指向关系,计算有效干扰距离,完成无线电台电磁干扰源定位。在测试参数支持下,将两种方法对比分析可知,该方法在无异常误差情况和有异常误差情况下定位误差都相对较小,为无线电台正常运行提供支持。

Aiming at the problem that the location error of traditional EMI source location method is large,a radio station EMI source location method based on Kalman filter is proposed.According to the beam coverage of radio signal transmission,the longitude and latitude orientation of jamming source is determined,and the Kalman filter method is applied to the process of jamming source positioning.The difference equation is obtained by the discretization result of the state equation,the filter gain matrix of the state is estimated,the variance matrix of the prediction error is calculated,and the state estimation value is obtained by recurrence calculation.According to the energy pressure system,time domain coincidence,frequency domain coincidence and spatial domain coincidence,the location elements of interference source are analyzed,the relationship between radio transmission line gain and interference source direction is determined,the effective interference distance is calculated,and the location of radio electromagnetic interference source is completed.Under the support of test parameters,the comparison of the two methods shows that the positioning error of the method is relatively small in the case of no abnormal error and abnormal error,which provides support for the normal operation of radio station.