The Compass Time System and its Interoperation

2012 ◽  
Vol 239-240 ◽  
pp. 548-551
Author(s):  
Shao Wu Dong
Keyword(s):  
Atomic Clock ◽  
Test System ◽  
Ground Control ◽  
Time System ◽  
Satellite Navigation System ◽  
System A ◽  
Timing System ◽  
Control Centre ◽  
Navigation Test ◽  
Atomic Time

We report on the time reference system of Compass global satellite navigation system and its interoperation with other GNSS’s. China has sent three satellites into geostationary orbit since 2000, and Compass Navigation Test System has been established. Compass time reference, named as BDT, is based on Atomic time, BDT is derived from the atomic clock ensemble in Compass ground control centre, and be traced to the international time, UTC. Interoperability is one of the most important aspect in the design of Compass timing system, a solution of time differences determination among BDT and other GNSS time scales are introduced in this paper.

scholarly journals Increased Likelihood of Pregnancy Using an App-Connected Ovulation Test System: A Randomized Controlled Trial

2020 ◽  
Vol 29 (1) ◽  
pp. 84-90 ◽  
Author(s):  
Sarah Johnson ◽  
Joseph B. Stanford ◽  
Graham Warren ◽  
Sharon Bond ◽  
Sharon Bench-Capon ◽  
...  
Keyword(s):  
Randomized Controlled Trial ◽  
Controlled Trial ◽  
Test System ◽  
Randomized Controlled ◽  
System A

Real Time Synchrotron Topography Using a CID Array Camera with Digital Image Acquisition and Processing

1994 ◽  
Vol 38 ◽  
pp. 215-219
Author(s):  
John M. Winter ◽  
Robert E. Green
Keyword(s):  
Real Time ◽  
Image Intensifier ◽  
Time System ◽  
Real Time System ◽  
X Ray ◽  
System A ◽  
Processing Software ◽  
Beam Transmission ◽  
Array Camera ◽  
Computer Board

Synchrotron white beam transmission topography of GaAs as previously reported by the authors relied on scanning specimen and film synchronously through the incident x-ray beam to record transmission topographic images en film. Sometimes the total dose required for reasonable contrast on film carried with it enough thermal deposition to cause elastic warping of the wafer. To escape these problems, a real time system was assembled. This system included an image intensifier, a solid state camera, a computer board to frame-grab and digitize images, and appropriate image processing software. With this system, a three inch specimen was scanned from edge to edge in one minute. At this scan rate, the incident x-ray beam had to be significantly attenuated to avoid saturating the intensifier output.

scholarly journals Limited Non-Preemptive EDF Scheduling for a Real-Time System with Symmetry Multiprocessors

Symmetry ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 172 ◽  
Author(s):  
Hoyoun Lee ◽  
Jinkyu Lee
Keyword(s):  
Real Time ◽  
Scheduling Algorithm ◽  
Schedulability Analysis ◽  
Timing Constraints ◽  
Limited Information ◽  
Time System ◽  
Real Time System ◽  
System A ◽  
The Future ◽  
Earliest Deadline

In a real-time system, a series of jobs invoked by each task should finish its execution before its deadline, and EDF (Earliest Deadline First) is one of the most popular scheduling algorithms to meet such timing constraints of a set of given tasks. However, EDF is known to be ineffective in meeting timing constraints for non-preemptive tasks (which disallow any preemption) when the system does not know the future job release patterns of the tasks. In this paper, we develop a scheduling algorithm for a real-time system with a symmetry multiprocessor platform, which requires only limited information about the future job release patterns of a set of non-preemptive tasks, called LCEDF. We then derive its schedulability analysis that provides timing guarantees of the non-preemptive task set on a symmetry multiprocessor platform. Via simulations, we demonstrate the proposed schedulability analysis for LCEDF significantly improves the schedulability performance in meeting timing constraints of a set of non-preemptive tasks up to 20.16%, compared to vanilla non-preemptive EDF.

Research on a High Effective Algorithm of PRACH Baseband Signal in TD-LTE System

2013 ◽  
Vol 380-384 ◽  
pp. 4031-4034
Author(s):  
Fa Tang Chen ◽  
Chi Yun Xu
Keyword(s):  
Random Access ◽  
Test System ◽  
Effective Algorithm ◽  
Conformance Test ◽  
Idle Mode ◽  
Generation Algorithm ◽  
System A ◽  
Baseband Signal

Random Access Procedure is a bridge between idle mode and connection mode in LTE system, and the algorithm of PRACH baseband signal we use will influence the performance of LTE system. A kind of High effective algorithm of PRACH baseband signal is introduced in this paper based on the research and analysis on the present PRACH baseband generation algorithm .By comparing and simulation, we find the algorithm introduced in this paper is feasible and effective. And this algorithm has been used in the RF conformance test system in LTE system.

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