Dissertation > Excellent graduate degree dissertation topics show

Research and Realization on Synchronization Technology of High Sensitivity GNSS Software Receiver

Author: JiangBingXin
Tutor: ZhangZhongZhao
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: software GPS receiver acquisition tracking whole bit algorithm averaging correlation
CLC: P228.4
Type: Master's thesis
Year: 2008
Downloads: 191
Quote: 1
Read: Download Dissertation

Abstract


High sensitivity GPS technology acquires and tracks weak GPS signals through specific algorithm to achieve the navigation and positioning in indoor environment. One of the important applications of weak-signal GPS positioning technology is the personal positioning service in emergency circumstances. Along with the improvement in HSGPS, the service is believed to have a promising market acceptance. This paper first briefly describes the concept, consistence and development trend of the GNSS system. Then it focuses on the theoretical research and software realization for the weak signal acquisition and tracking of the GPS system which is the most mature and widely used currently.First we briefly describe the consistence and positioning principle of GPS system, analyze the signal processing procedure of the RF front-end, directly generate the IF digital sequence which is the output of the RF front-end ADC converter, and add WGN to construct signals with different SNR as simulation signal sources.Second we analyze the generation principle of the Doppler phenomenon, analyze the coherent cumulative algorithm (CC), non-coherent cumulative algorithm (NCC), differential coherent cumulative algorithm (DCC) which are used in GPS acquisition step and make a comparison among them.Third, we provide the definition of weak GPS signal, analyze the main factor of its origin and propose three improvements for weak signal processing. Among them, the whole bit acquisition algorithm solves the problem of searching bit edges and maximizes the processing gain of the combination of CC and NCC, which follows it. Aaveraging correlation algorithm deals with the computation burden of the 2-based FFT under 5MHZ sampling frequency, which is used to compute the C/A code correlation peak in frequency domain. We provide complete acquisition module, simulate and compare the performances of the improved algorithm and differential algorithm. The result shows the effectiveness of the improved whole bit acquisition algorithm for the acquisition of the weak signal.The acquisition step completes the in-accurate estimation of the C/A code phase and doppler frequecy and tracks the GPS signal on such bases. This paper is divided into three parts, which can be followed as the discussion of the principle and structure of DLL, FLL and PLL, procedure of signal processing and discriminator algorithm. We simulate the synchronical tracking of the C/A code and the carrier. After all, we realize the system by C under VC++ 6.0.

Related Dissertations

  1. Design and Development of Application Programme for Fault Analyzer Based on Wince Platform,TP311.52
  2. High Dynamic Carrier Tracking Algorithm of Software GNSS Receiver,P228.4
  3. Research on the Aiming Signal Processing of the Optical Probe Measurement System,TH74
  4. Research on Synchronous Acquisition and Processing System Detecting Defocus Signal Based on DSP,TH741
  5. Research on Gyro Stabilized and Tracking Platform,V241.5
  6. Research on Techniques of Information Acquisition and Location in Pavement Roughness Inspection,U416.2
  7. Study of Automobile Ignition Coil Testing System Based on Standard LAH032.905,U472.9
  8. Research of Image Guided Technology for Cable Tunnel Patrol Vehicle,U469.6
  9. Research on Spread Spectrum Code Acquisition of Double Threshold Based on Sliding Correlator,TN914.42
  10. Maneuver Detection and Tracking with the Radar Rate Measurement,TN953
  11. The Maneuvering Target Tracking Research Based on VRPF,TN957.52
  12. Research of Electromagnetic Tracking Experimental System for Medical Application,TN966
  13. Research on Multi-Sensor Embattling and Continious Tracking Technique Applying for Anti-Stealth and Anti-Interference,TN953
  14. Research and Hardware Simulation of Multiuser Spread Spectrum Code Acquisition Based on FPGA,TN914.42
  15. Research on Intelligent Learning-Based Multi-Sensor Target Recognition and Tracking System,TP391.41
  16. Research on Extraction and Tracking of People’s Opinion,TP391.1
  17. Research on Visual Measurement for Spacecraft Rendezvous and Approach,TP391.41
  18. Research on the Image Real-Time Acquisition, Storage and Image Processing System,TP391.41
  19. Logistics Management System Supporting Product and Material Tracing and Tracking,TP311.52
  20. The Research of Moving Object Tracking System Based on Embeded Image Process Unit,TP391.41

CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
© 2012 www.DissertationTopic.Net  Mobile