基于原子分解的多Chirp信号到达时差估计

TDOA Estimation for Multiple Chirp Based on Adaptive Chirplet Atomic Decompositon

针对多Chirp信号交叠的复杂环境下的到达时差估计问题,引入原子分解理论进行分析。首先对主站信号进行自适应Chirplet原子分解,获取交叠信号个数并分解得到相应的主要原子,然后利用获得的主站信号原子参数进一步估计和构建辅站转发信号的原子库,分别计算主辅站间各个对应原子的相关结果,利用相关峰值的位置可以估计出主辅站间各个Chirp信号的到达时差,从而进一步可以为实现同时对多Chirp辐射源的侦察定位提供依据,最后通过仿真验证了该方法的正确性和有效性。

TDOA estimation for overlapping signal of multiple chirp by employing atomic decomposition technique was proposed with chirplet atomic decomposition,the overlapping signal directly received of main-receiver could be approached by some chirplet atom,the number of chirp could be estimated and the atom dictionary could be constructed.Using parameters of atom dictionary of main-receiver signal,the atom dictionary of overlapping signal from sub-receiver could be obtained.Then the correlation of every pair atom between main-receiver signal and sub-receiver signal was computed.Through searching the peak of correlation,TDOA of every chirp component could be estimated,so every radar emitter could be located.Simulations show that the performance of this method is better than that of traditional computing correlation between signals received by main-receiver and sub-receiver.