Dissertation > Excellent graduate degree dissertation topics show

Time Delay Estimation in Distributed Optical Fiber Sensing and Positioning System

Author: ZhangYan
Tutor: QiuTianShuang
School: Dalian University of Technology
Course: Signal and Information Processing
Keywords: Time Delay Estimation Distributed Fiber Correlated Noise Kalman Filter
Type: Master's thesis
Year: 2011
Downloads: 61
Quote: 0
Read: Download Dissertation


In recent years, with the development of "West-to-East Natural Gas Transmission Project", the oil and gas pipeline length is increasing continually. As a result, the oil pipeline safety issues are becoming increasingly prominent and oil stolen or leakage accidents continually occur. Therefore, studies on oil pipeline safety alarm and positioning system are gradually carried out.The research of oil pipeline safety alarm and positioning system belongs to traditional time delay estimation field, yet with some specialty. In the system, distributed fiber sensors collect vibration signals around the oil pipeline which are then sent to monitoring center. Then the monitoring center detects the signal and locates events by time delay estimation algorithm. Once there is an abnormal event, the system will alarm the pipeline inspection staff to check dangerous condition. The distributed sensing in the system will certainly cause the signal received is a mixture of all vibrations around the pipeline. Thus it is much more difficult to estimate the time delay for positioning the real abnormal event.Specific to that characteristic of the distributed sensing and positioning system, this paper provides a whole solution, including data collection, preprocessing and positioning. First, this paper analyzes distributed fiber system and data characteristics, constructs time delay system transmission model and design data detection scheme to separate abnormal event data with normal one. The data quality is also analyzed for assessing the time delay estimation results. Then, two algorithms are provided for data preprocessing (Principle Component Analysis (PCA) algorithm and cepstrum filtering algorithm). Then, it comes the time delay estimation process. This paper use two time delay estimation methods. A modified generalized correlation method is designed to eliminate correlated noises. The Modified Chirp Z-Transform(MCZT) method is designed for narrowband signal. Both of the methods achieve good results in practical tests. At last, in order to improve time delay estimation robustness, a data fusion algorithm based on probability density curve and Kalman filter is used.Finally, the solution designed in this paper can control the estimation error within 0.2 sampling interval (800 meters) in practical application with good and robust results.

Related Dissertations

  1. Algorithm Research on SINS/GPS Integrated Navigation Syste,V249.328
  2. Design of Gyro Stabilized Pod Control System,TP273
  3. State of Charge Accurate Estimation Based on Kalman Filtering for Power Battery,TM912
  4. The Study on Algorithms of Strapdown Inertial Navigation System and Kalman Filter of the Integrated Navigation Using Precise Integration Method,TN967.2
  5. Adaptive Method for Anomaly Detection Based on Kalman Filter,TN915.08
  6. Single Observer Passive Location Algorithm,TN953
  7. Design and Implementation of the Electro-tracker in Tracker Radar System,TN953
  8. Multi-radar data fusion automation system subsystem Research and Implementation,TN957.51
  9. Study of Kalman Filter Applied in Phase Unwrapping of InSAR,TN958
  10. 360 degree rotation based on single- camera tracking system,TP391.41
  11. Yellow grid illegal parking monitoring system design and software processes,TP274
  12. The Research of Data Fusion in Wireless Sensor Network,TP202
  13. Research on Autonomous Navigation Method of Underwater Vehicle Based on Multi-Sensor Fussion,TP242
  14. Study on Location Technology for Space Non-Cooperative Target Based on the Extended Kalman Filter,V448.2
  15. Research on Tracking and Discrimination Methods Based on Mass-to-Drag Ratio for Reentry Ballistic Targets,TJ761.3
  16. GPS signal adaptive interference System,P228.4
  17. Analysis and Calibration of Three-axis Fluxgate Magnetometers Error,TH762.3
  18. Study on Model-based Human Motion Tracking and Gesture Analysis Technology,TP391.41
  19. Distributed multi-view tracking method and implementation of statistical inference,TP391.41
  20. Based on a combination of multi-sensor automated guided vehicle systems research and application,TP242.2
  21. Mobile robot based on GPS / DR integrated positioning technology research,TN967.2

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar
© 2012 www.DissertationTopic.Net  Mobile