一种基于四阶累积量的约束自适应多径时延估计  

A Constrained Adaptive Multipath Time Delay Estimator Based on Fourth-Order Cumulants

作　　者：熊秋犇 王江[2] 杨景曙[2] 

机构地区：[1]解放军92773部队 [2]电子工程学院

出　　处：《电子信息对抗技术》2011年第3期10-15,共6页Electronic Information Warfare Technology

摘　　要：在存在多径信号和空间相关性未知的背景高斯噪声情况下,不考虑多径信号传输的传统时延估计方法的性能会受到影响,甚至恶化。针对此问题,提出了一种基于四阶累积量的约束自适应多径时延估计算法,并对该算法的多径时延估计性能进行了收敛性能分析。该算法能够有效抑制空间相关性未知噪声的影响,在低信噪比的情况下能够直接、准确地进行自适应多径时延估计,克服了传统算法不能直接估计非整数倍采样间隔时延的缺点。计算机仿真试验验证了新算法的有效性。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.

关 键 词：自适应 多径时延估计 四阶累积量 

分 类 号：TN971.3[电子电信—信号与信息处理]