一种多Chirp信号交叠环境下TDOA估计的新方法

TDOA estimation of the overlapping signal of multiple chirps

将原子分解理论应用到无源侦察时差定位系统中,给出了多Chirp信号交叠情况下的原子分解,提出了利用分解后的原子进行TDOA估计.在多Chirp信号交叠到达时,对主站信号进行Chirplet原子分解,获取交叠信号个数,并构建相应的原子库.将原子分别与辅站转发来的信号进行相关运算,根据相关峰的位置可计算出各Chirp信号到达主辅站间的时差,实现同时对多Chirp辐射源的侦察定位.通过仿真,验证了该方法的正确性和有效性.

TDOA estimation of the overlapping signal of multiple chirps with atomic decomposition is studied,and the algorithm for the TDOA estimation of signals based on chirplet atomic decomposition is derived.Using chirplet atomic decomposition,the overlapping signal received directly from the master-receiver can be approached by some chirplet atom dictionary.And then we compute the correlation between each atom and overlapping signal from the slaver-receiver,and search for the peak of correlation.TDOA of every chirp between master-receiver and slave-receiver can be estimated.Simulation shows that the performance of this method is better than that of computing correlation only between signals received by the master-receiver and slave-receiver.