摘要
提出一种基于最小二乘准则的高分辨率多径信号时延测量方法。对参考信号作三阶样条插值获得每条多径信号最小二乘意义的最优估计,用每条多径信号的测量值重构接收信号,通过反复迭代使重构信号是接收信号最小二乘意义的最优估计,实现多径信号的时延测量。仿真结果表明:新算法在低信噪比、窄带信号条件下仍能获得较高的时延测量精度,性能优于MUSIC类时差测量算法。
A new high-resolution algorithm for time delay estimation of multipath propagation signals based on least square criterion was proposed in this paper. The received data was decomposed into the signal components and then to estimate the amplitude and time delay of each signal component separately,while the cubic spline interpolation being used and based on least square criterion.The received data was reconstructed by signal components through iterated back and forth to let the reconstructs data to be the best estimation of the received data.The simulation results showed that the algorithm was very robust under the low signal-to-noise ratio（SNR）,which could provide high-resolution and accuracy time delay estimation in low SNR,narrowband signal and multipath environments and have the better performance than multiple-signal-classification（MUSIC） method of time difference measurement.
出处
《上海航天》
2010年第6期52-56,共5页
Aerospace Shanghai
基金
国家自然科学基金(60496315)
航天支撑技术基金(20060307)
关键词
时延测量
窄带多径信号
最小二乘准则
三阶样条插值
Time delay estimation
Narrowband signal multipath signals
Least square criterion
Cubic spline interpolation
