基于时差的宽带相干多辐射源测向算法

Multiple Radiation Sources Direction Finding Algorithm of Wideband Coherent Signal Based on Time-Delay

为了防反辐射弹,通常在一定的范围内放置两个或者两个以上的辐射源。该多个辐射源的参数相同,距离也比较靠近。如果运用传统的宽带测向技术,将无法对多个辐射源进行准确测向。针对宽带多辐射源测向问题,本文采用单基线系统,根据两个阵元接收信号谱线共轭相乘产生的新信号谱线结构关系,间接估计出各个辐射源到达两个天线阵元的时差,并通过去直流方法来提高时差估计精度。仿真结果表明,该算法设备简单,在一定条件下测向精度较高。

In the area of modern electronic warfare,two or more radiation sources are always placed within a certain range to prevent the attack from anti-radiation missile.These radiation sources are placed closely and their parameters are identical.In the case of multiple radiation sources,traditional direction finding algorithms of wideband signal cannot achieve good direction finding precision.Therefore,the single baseline system is set.New signals are created by the conjugate multiplication of signal spectrums received by two antenna array.According to the spectrum structure relationship of new signals,the timedelay estimation of radiation sources can be obtained indirectly.And the precision of the time-delay can be improved by wiping off the direct current component.The method has the feature of simple equipment.Simulation results show that the algorithm has good direction finding precision under certain conditions.