scholarly journals Research on Remote GPS Common-View Precise Time Transfer Based on Different Ionosphere Disturbances

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2290 ◽  
Author(s):  
Jingkui Zhang ◽  
Jingxiang Gao ◽  
Baoguo Yu ◽  
Chuanzhen Sheng ◽  
Xingli Gan
Keyword(s):  
Correction Method ◽  
Propagation Path ◽  
Major Error ◽  
Time Transfer ◽  
Ionospheric Correction ◽  
Common View ◽  
Advantages And Disadvantages ◽  
Source Data ◽  
Ionosphere Disturbance ◽  
Precise Time

Propagation path delays are a major error for the remote precise time transfer of common view; these path delays contain the ionosphere and troposphere impact, while the contributions of the ionosphere and the troposphere from common-view satellites to receivers on the ground tend to become uncorrelated when the distance between these receivers increases. In order to select the appropriate ionospheric correction method for common view under different distances between receivers, a detailed test using multi-source data under different ionosphere disturbances are carried out in this paper. Here, we choose three different ionosphere disturbance methods and analyze the advantages and disadvantages of these methods for common-view time transfer and time comparison. At last, we put forward a suitable ionospheric correction method for different distances common view. The RMS shows that the method proposed for 3000 km remote common view can achieve 2.5 ns.

Effects of ionospheric correction on GPS time transfer throughout Asia

Metrologia ◽  
2004 ◽  
Vol 41 (3) ◽  
pp. 145-151 ◽  
Author(s):  
Miho Fujieda ◽  
Michito Imae ◽  
Yasuhisa Shibuya
Keyword(s):  
Time Transfer ◽  
Ionospheric Correction

scholarly journals Effects of Atmospheric Refraction on an Airborne Weather Radar Detection and Correction Method

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Lei Wang ◽  
Ming Wei ◽  
Tao Yang ◽  
Ping Liu
Keyword(s):  
Weather Radar ◽  
Weather Conditions ◽  
Refraction Index ◽  
Correction Method ◽  
Propagation Path ◽  
Radar Detection ◽  
Atmospheric Refraction ◽  
Radar Beam ◽  
Fitting Method ◽  
Flight Parameters

This study investigates the effect of atmospheric refraction, affected by temperature, atmospheric pressure, and humidity, on airborne weather radar beam paths. Using three types of typical atmospheric background sounding data, we established a simulation model for an actual transmission path and a fitted correction path of an airborne weather radar beam during airplane take-offs and landings based on initial flight parameters and X-band airborne phased-array weather radar parameters. Errors in an ideal electromagnetic beam propagation path are much greater than those of a fitted path when atmospheric refraction is not considered. The rates of change in the atmospheric refraction index differ with weather conditions and the radar detection angles differ during airplane take-off and landing. Therefore, the airborne radar detection path must be revised in real time according to the specific sounding data and flight parameters. However, an error analysis indicates that a direct linear-fitting method produces significant errors in a negatively refractive atmosphere; a piecewise-fitting method can be adopted to revise the paths according to the actual atmospheric structure. This study provides researchers and practitioners in the aeronautics and astronautics field with updated information regarding the effect of atmospheric refraction on airborne weather radar detection and correction methods.

Multiple GNSS inter-system biases in precise time transfer

2019 ◽  
Vol 30 (11) ◽  
pp. 115003 ◽  
Author(s):  
Rui Tu ◽  
Ju Hong ◽  
Pengfei Zhang ◽  
Rui Zhang ◽  
Lihong Fan ◽  
...  
Keyword(s):  
Time Transfer ◽  
Precise Time

Comparison of Two-Way and BeiDou Common View Time Transfer between NTSC and BEIJ Station

2014 ◽  
Vol 1049-1050 ◽  
pp. 1997-2000 ◽  
Author(s):  
Hong Zhang ◽  
Min Yan ◽  
Wei Guang
Keyword(s):  
Data Analysis ◽  
Service Center ◽  
Time Transfer ◽  
Time Service ◽  
Common View ◽  
High Agreement ◽  
Frequency Transfer

The data obtained by the two-way satellite time and frequency transfer (TWSTFT) and the BeiDou common view (BDCV) experiments between the National Time Service Center (NTSC) and Beijing station (BEIJ) will be compared in this paper. Results with high agreement between the two techniques will be described. Data analysis results demonstrated that the two-way satellite time and frequency transfer (TWSTFT) and the BeiDou common view (BDCV) can back up each other.

The Use of Satnav Systems for Precise Time Transfer

1984 ◽  
Vol 37 (3) ◽  
pp. 348-353
Author(s):  
J. D. H. Pilkington
Keyword(s):  
Time Transfer ◽  
Daylight Saving Time ◽  
Daylight Saving ◽  
The Earth ◽  
The Status ◽  
Rotation Of The Earth ◽  
Economic Necessity ◽  
Precise Time ◽  
Do So

Everyone needs a knowledge of ‘the time’, even if the accuracy required is only sufficient to keep an appointment, catch a train or watch a particular TV programme. An isolated clock, started at random and ticking at an unknown rate, can only be used to compare intervals of time. Although this is often useful – for example, in cookery or athletics – the full value of a clock can be realized only if its reading provides a model of the status of a continuing process (such as the rotation of the Earth) or if the clock is a member of a group of clocks, all of which show the same time and may be expected to continue to do so. Particular applications may demand that some members of the group must be kept in closer agreement than others, or must all reliably remain within a stated tolerance for a longer period, but specifications of this kind arise only from economic necessity; in principle all clocks should agree at all times – subject, of course to the unavoidable restrictions imposed by the laws of physics and perhaps the complexities of daylight-saving time.

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