Note: Precise phase and frequency comparator based on direct phase-time measurements

2014 ◽  
Vol 85 (12) ◽  
pp. 126110 ◽  
Author(s):  
Ivan Prochazka ◽  
Petr Panek ◽  
Jan Kodet
Keyword(s):  
Phase Time ◽  
Frequency Comparator

scholarly journals The research on carrier phase time transfer method based on least curve fitting

2021 ◽  
Vol 783 (1) ◽  
pp. 012091
Author(s):  
Xiang-Lei Wang ◽  
Shi-Yi Xu ◽  
Jing-Xuan Xu ◽  
Fei Zeng
Keyword(s):  
Curve Fitting ◽  
Carrier Phase ◽  
Time Transfer ◽  
Phase Time ◽  
Transfer Method

scholarly journals Constructing Adaptive Deformation Models for Estimating DEM Error in SBAS-InSAR Based on Hypothesis Testing

2021 ◽  
Vol 13 (10) ◽  
pp. 2006
Author(s):  
Jun Hu ◽  
Qiaoqiao Ge ◽  
Jihong Liu ◽  
Wenyan Yang ◽  
Zhigui Du ◽  
...  
Keyword(s):  
Time Series ◽  
Hypothesis Testing ◽  
Surface Deformation ◽  
A Priori ◽  
Least Square ◽  
Deformation Model ◽  
Phase Time ◽  
Testing Theory ◽  
Sbas Insar ◽  
Deformation Models

The Interferometric Synthetic Aperture Radar (InSAR) technique has been widely used to obtain the ground surface deformation of geohazards (e.g., mining subsidence and landslides). As one of the inherent errors in the interferometric phase, the digital elevation model (DEM) error is usually estimated with the help of an a priori deformation model. However, it is difficult to determine an a priori deformation model that can fit the deformation time series well, leading to possible bias in the estimation of DEM error and the deformation time series. In this paper, we propose a method that can construct an adaptive deformation model, based on a set of predefined functions and the hypothesis testing theory in the framework of the small baseline subset InSAR (SBAS-InSAR) method. Since it is difficult to fit the deformation time series over a long time span by using only one function, the phase time series is first divided into several groups with overlapping regions. In each group, the hypothesis testing theory is employed to adaptively select the optimal deformation model from the predefined functions. The parameters of adaptive deformation models and the DEM error can be modeled with the phase time series and solved by a least square method. Simulations and real data experiments in the Pingchuan mining area, Gaunsu Province, China, demonstrate that, compared to the state-of-the-art deformation modeling strategy (e.g., the linear deformation model and the function group deformation model), the proposed method can significantly improve the accuracy of DEM error estimation and can benefit the estimation of deformation time series.

scholarly journals Determination of the tunneling flight time as the reflected phase time

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
Tom Rivlin ◽  
Eli Pollak ◽  
Randall S. Dumont
Keyword(s):  
Flight Time ◽  
Phase Time

An Automatic Electronic Frequency Comparator

1974 ◽  
Vol 20 (8) ◽  
pp. 405-407
Author(s):  
A. R. Patankar ◽  
K. P. P. Nambiar ◽  
M. R. Sitharaman
Keyword(s):  
Frequency Comparator ◽  
Electronic Frequency

A detailed comparison of two continuous GPS carrier-phase time transfer techniques

Metrologia ◽  
2015 ◽  
Vol 52 (5) ◽  
pp. 666-676 ◽  
Author(s):  
Jian Yao ◽  
Ivan Skakun ◽  
Zhiheng Jiang ◽  
Judah Levine
Keyword(s):  
Carrier Phase ◽  
Detailed Comparison ◽  
Time Transfer ◽  
Phase Time ◽  
Continuous Gps
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