A Constrained Adaptive Multipath Time Delay Estimator Based on Fourth-Order Cumulants
Yang Jing-shu · Electronic Information Warfare Technology · 2011
When there are multipath signals and spatial unknown correlated Gaussian noises,the behaviors of the traditional methods for time delay estimation without regard to multipath signals are declined,even deteriorated.Therefore,a constrained adaptive multipath time delay estimator based on fourth-order cumulants is proposed,and the convergence behaviors of multipath time delay estimation of this method are derived.This approach can suppress spatial unknown correlated Gaussian noises effectively,and it also can attain both time delay and multipath time delays which are not an integer multiple of sampling interval accurately and directly at a low signal-to-noise ratio environment,while the traditional method can't attain directly.The simulation examples are presented to demonstrate the effectiveness of this new approach.