测量TDOA的完全非同步照射辐射源定位算法

An Absolutely Asynchronous Radiation Emitter Location Method by Measuring TDOA

针对现有基于TDOA的定位算法难以适应信号完全非同步到达的辐射源定位问题,提出了一种新的基于TDOA的完全非同步照射辐射源定位算法。由各观测站自动提取辐射源脉冲样本图及开始时间,副站将提取的脉冲样本图及开始时间传给主站,主站利用脉冲样本图匹配及外推技术得到TDOA序列(TDOAs),解决了非同步照射引起的无法计算TDOA问题。通过计算两条时差双曲线的渐近线交点近似求取初值,通过牛顿迭代法实现对辐射源位置的估计。最后给出的数值仿真结果验证了该方法的有效性。

As the existing location methods based on TDOA can’t adapt to absolutely asynchronous arrival location problem of emitter signals,a new absolutely asynchronous radiation emitter location algorithm is proposed in this paper.Firstly every observing platform self-extracts the pulse pattern and its starting time of the emitter from the received pulse sequence respectively,and then the vice platforms transform the extracted pulse patterns and their starting times to the main platform. Finally,the main platform calculates the TDOA sequence （TDOAs）through the pulse pattern matching and extrapolating technique.This processing method solves the TDOA calculating difficulty problem brought by absolutely asynchronous radiation.The emitter position is estimated through the Newton iterative algorithm.The initial value of the Newton iterative algorithm is approximately obtained through calculating the intersection of two hyperbolas’asymptotes formed by the average TDOA of the TDOAs.Simulation results verify the effectiveness and correctness of the proposed algorithm.