Dissertation > Excellent graduate degree dissertation topics show

The Research on Applying Virtual Instrument Technology to Measure and Monitor Low-frequency Time-codes Time Service Signal

Author: LiuZhiFang
Tutor: WuGuiChen
School: Graduate School , Chinese Academy of Sciences ( National Time Service Center )
Course: Measuring Technology and Instruments
Keywords: Low-frequency time-code time service Virtual Instrument LabVIEW Field strength measurement carrier phase measurement monitor filter network testing
CLC: TP391.9
Type: Master's thesis
Year: 2007
Downloads: 82
Quote: 0
Read: Download Dissertation

Abstract


Low-frequency time-codes time service is recommended by ITU-R in middle or low precision time service systems. At present, the measuring method and instrumentation which is noticed in ITU-R new questions influencing the application of low-frequency time-codes time service system severely. It is very important to develop appropriate instrumentation to measure the transmitted signal in research and applications.Several formats of low-frequency time-codes signal were introduced, including DCF77, JJY and BPC. Based on the signal characteristic, the definition of signal field strength is given. Furthermore, the arithmetic to measure field strength and carrier phase is discussed and simulated by Matlab. The simulation figures that the arithmetic works very well.Virtual instruments technology, combined the computer technology and traditional testing technology, is the future of the modern testing system and is very befitting to be applied in measuring and monitoring low-frequency time-code time service signal. The portable BPC measuring system and monitoring system with software LabVIEW and DAQ (data acquisition) cards are discussed. The hardware composition and software structure are presented.With the developed instrumentation, the interference in receiving low-frequency time-codes signal is studied. There is some narrow band interference in the received signal which will severely damage the application. The experiments indicate that the interference can be cancelled by adaptive trap filter very well.Another important part is to release the monitoring result on the Internet. After compared the four methods used in virtual instruments, the result releases on the web by remote panel and datasocket technology.

Related Dissertations

  1. Image Analysis System of Metal Transfer of Gas Metal Arc Welding,TG444
  2. Research on Electromagnetic Acoustic Transducer Detection System Based on FPGA,TH878.2
  3. Algorithm Research on SINS/GPS Integrated Navigation Syste,V249.328
  4. Satellite Attitude Determination Based on Gyro and Star Sensor,V448.2
  5. Research on Transfer Alignment of the Missile Onboard the Aircraft,V249.322
  6. Development of GJB1188A Bus Signal Monitoring and Recording Device,V248.2
  7. Research on Cooperative Orbit Determination in Satellite Network Based on Multi-Agent System Theory,V474
  8. Research on Data Acquisition and Processing Methods for Weapon Evaluation System,TJ06
  9. Study of Automobile Ignition Coil Testing System Based on Standard LAH032.905,U472.9
  10. The Study of Control Algorithm for Automotive Power Window Based on Lin Bus,U463.6
  11. Research on Nozzle Plume Temperature Distribution Measurement System,V434
  12. Study of Three-Phase AC Chopper Surge and Its Harmonic Elimination Technology,TM423
  13. Design of Servo Control System with Linear Motor Based on Digital Filter Technology,TM359.4
  14. Maneuver Detection and Tracking with the Radar Rate Measurement,TN953
  15. The Maneuvering Target Tracking Research Based on VRPF,TN957.52
  16. Design and Processing of Hybrid Modulated HF Radar Waveform,TN958.93
  17. Software Design of Muliparameter On-Line Monitoring System in Water-Quality,TP3
  18. Research of High Speed Image Pre-processing System Based on FPGA,TP391.41
  19. Research on Methods of Medical Ultrasound Image Denoising,TP391.41
  20. The Study and Design of High Availability Monitoring Subsystem for Fault Tolerant Computing Systems,TP311.52
  21. The Research of 3D Human Motion Capture Based on Reference Points,TP391.41

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Computer simulation
© 2012 www.DissertationTopic.Net  Mobile