scholarly journals Sky–ground wave signal separation in enhanced Loran based on Levenberg–Marquart algorithm

2021 ◽  
Author(s):  
Zhenzhu Zhao ◽  
Jiangfan Liu ◽  
Jinsheng Zhang ◽  
Xiaoli Xi
Keyword(s):  
Signal Separation ◽  
Wave Signal ◽  
Ground Wave

The Measurement and Time Series Analysis of Loran C Ground Wave Propagation Delay

2012 ◽  
Vol 457-458 ◽  
pp. 74-78
Author(s):  
Wu Nong Xu ◽  
Fen Liu
Keyword(s):  
Signal Propagation ◽  
Propagation Delay ◽  
Time Study ◽  
Delay Test ◽  
Cycle Model ◽  
Positioning Accuracy ◽  
Wave Signal ◽  
The Stability ◽  
Ground Wave ◽  
Delay Variation

In order to effectively correct the positioning error of Loran C to improve the positioning accuracy, it is necessary to study Loran C ground wave signal propagation delay variation with time, study the stability of propagation delay and timing characteristics. Take statistical analysis and pretreatment to Loran C ground wave signal propagation delay, test its stationarity, extraction its trend term, obtain stationary series, modeling to trend term and stationary series. The results show that Loran C ground wave signal propagation delay has good stability and repeatability, the time delay series can be fitted to combination model formed by G (2,1) cycle model and AR (p) from the regression model.

The efficiency of application of virtual cross-sections method and hypotheses MELS in problems of wave signal propagation in elastic waveguides with rough surfaces

2016 ◽  
pp. 3564-3575 ◽  
Author(s):  
Ara Sergey Avetisyan
Keyword(s):  
Half Space ◽  
Cross Sections ◽  
Classical Method ◽  
Signal Propagation ◽  
Elastic Half Space ◽  
Layered Systems ◽  
Surface Layers ◽  
Inhomogeneous Surface ◽  
Wave Signal ◽  
The Impact

The efficiency of virtual cross sections method and MELS (Magneto Elastic Layered Systems) hypotheses application is shown on model problem about distribution of wave field in thin surface layers of waveguide when plane wave signal is propagating in it. The impact of surface non-smoothness on characteristics of propagation of high-frequency horizontally polarized wave signal in isotropic elastic half-space is studied. It is shown that the non-smoothness leads to strong distortion of the wave signal over the waveguide thickness and along wave signal propagation direction as well.  Numerical comparative analysis of change in amplitude and phase characteristics of obtained wave fields against roughness of weakly inhomogeneous surface of homogeneous elastic half-space surface is done by classical method and by proposed approach for different kind of non-smoothness.

A Modified JadeR for Signal Separation under Gaussian Noise

2018 ◽  
Vol 5 (3) ◽  
pp. 27-31
Author(s):  
Muna Fatnan ◽  
◽  
Zahir Hussain ◽  
Hind Mohammed ◽  
◽  
...  
Keyword(s):  
Gaussian Noise ◽  
Signal Separation
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