Adaptively precise time synchronization technique for inter-satellite link equipment of navigation satellite

2016 ◽  
Author(s):  
Xiye Guo ◽  
Kai Liu ◽  
Jun Yang
Keyword(s):  
Time Synchronization ◽  
Navigation Satellite ◽  
Satellite Link ◽  
Precise Time

scholarly journals Orbit determination and time synchronization for BDS-3 satellites with raw inter-satellite link ranging observations

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Rengui Ruan ◽  
Xiaolin Jia ◽  
Laiping Feng ◽  
Jun Zhu ◽  
Zongbo Huyan ◽  
...  
Keyword(s):  
Orbit Determination ◽  
Time Synchronization ◽  
Satellite Link

Novel Precise Time Synchronization and Distribution for Multilayer Optical Metro and Access Networks

2021 ◽  
Author(s):  
Bitao Pan ◽  
Xuwei Xue ◽  
Fulong Yan ◽  
Xiaotao Guo ◽  
Nicola Calabretta
Keyword(s):  
Time Synchronization ◽  
Access Networks ◽  
Precise Time

scholarly journals Distributed Orbit Determination for Global Navigation Satellite System with Inter-Satellite Link

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1031 ◽  
Author(s):  
Yuanlan Wen ◽  
Jun Zhu ◽  
Youxing Gong ◽  
Qian Wang ◽  
Xiufeng He
Keyword(s):  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Global Navigation Satellite System ◽  
Orbit Determination ◽  
Measurement Data ◽  
Satellite System ◽  
Navigation Satellite ◽  
Satellite Link ◽  
Global Navigation ◽  
Global Navigation Satellite

To keep the global navigation satellite system functional during extreme conditions, it is a trend to employ autonomous navigation technology with inter-satellite link. As in the newly built BeiDou system (BDS-3) equipped with Ka-band inter-satellite links, every individual satellite has the ability of communicating and measuring distances among each other. The system also has less dependence on the ground stations and improved navigation performance. Because of the huge amount of measurement data, the centralized data processing algorithm for orbit determination is suggested to be replaced by a distributed one in which each satellite in the constellation is required to finish a partial computation task. In the present paper, the balanced extended Kalman filter algorithm for distributed orbit determination is proposed and compared with the whole-constellation centralized extended Kalman filter, the iterative cascade extended Kalman filter, and the increasing measurement covariance extended Kalman filter. The proposed method demands a lower computation power; however, it yields results with a relatively good accuracy.

scholarly journals The Effect of Time Synchronization Error in LAN-Based Digital Substation

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2044 ◽  
Author(s):  
Kyou Jung Son ◽  
Tae Gyu Chang ◽  
Sang-Hee Kang
Keyword(s):  
Time Synchronization ◽  
Synchronization Error ◽  
Distance Protection ◽  
Proposed Model ◽  
Power Substation ◽  
Digital Substation ◽  
Good Guide ◽  
Precision Time ◽  
Intelligent Electronic Devices ◽  
Precise Time

In this paper, the effect of time synchronization error on protection algorithms are studied for the usage of the LAN-based collaborative protection. In order to derive the effect of time synchronization, this paper proposes a substation model which is constructed with IEEE 1588 Precision Time Protocol (PTP) supported intelligent electronic devices. The proposed model is used as an example of a target platform to study the effect of time synchronization error with two typical substation protection algorithms, i.e., current differential-based substation protection and distance protection algorithms. From the analyzed and the simulated results, it was well observed that time synchronization error is a significant error-causing factor for both protection algorithms, resulting in erroneous detection of faults and erroneous estimation of fault distances, respectively. The results of research performed in this paper are expected to provide a good guide for constructing the future LAN-based digital power substation with precise time synchronization.

LXI Precision Time Protocol Applied Research

2013 ◽  
Vol 330 ◽  
pp. 561-564 ◽  
Author(s):  
Ming Li ◽  
Chun Ping Wang ◽  
Zhi Qiang Wang
Keyword(s):  
Real Time ◽  
Applied Research ◽  
Time Synchronization ◽  
Local Area Network ◽  
Local Area ◽  
Test System ◽  
Area Network ◽  
Automatic Test System ◽  
Precision Time ◽  
Precise Time

In order to meet the real-time demands of some equipment networked test, the time synchronization techniques of ATS based traditional instrument buses are compared with the techniques of LXI ATS. Accordingly，the necessity of LXI ATS time synchronization technique study is put forward. The sorts of time synchronization techniques based on Local Area Network are analyzed. In addition, some methods which could improve the level of LXI data real-time communications are presented. Afterwards, technique realizations of PTP are studied in detail. Local Area Network techniques and IEEE 1588 Precise Time Protocol are adopted in the LXI Automatic Test System which designed in the paper, and the level of time synchronization precision in the system is improved.

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