Dissertation > Excellent graduate degree dissertation topics show

Research on Acquisition and Code Tracking Technology of Weak GNSS Signal

Author: ShenYingJie
Tutor: ZhaoMinJian；ZhaoWenDao
School: Zhejiang University
Course: Information and Communication Engineering
Keywords: Weak Signal Environment Sensitivity Anti-multipath GNSS Acquisition Code Tracking
CLC: P228.4
Type: Master's thesis
Year: 2012
Downloads: 281
Quote: 2
Read: Download Dissertation

Abstract


With the increasing diversification of Global Navigation Satellite System (GNSS) application scenarios, the technology of GNSS signal receiving in weak signal environment is attracting more and more attention. Due to propagation obstacles in such environment, the received signal usually suffers heavy power attenuation multipath effects and cross-correlation interference, which is a big challenge for the research on technology of weak GNSS signal receiving. This thesis focuses on exploring improved algorithms for acquisition and code tracking of weak GNSS signal.In order to improve acquisition sensitivity for GNSS receivers, this thesis proposed a novel detection algorithm based on peak position finding. Aiming at multipath resistance, an averaging filter based algorithm named AFPDI was designed here, which is capable of implementing anti-multipath in acquisition. On the other hand, this thesis also demonstrated the improved MEDLL and RLS algorithm, according to the existing algorithm. That makes code tracking loop more robust in multipath scenarios. The main chapters in this thesis are organized as follows:(1).In order to establish theoretical basis for following chapters, this thesis described the general expression and base-band signal processing for GNSS signal. It also discussed the signal characteristic in weak signal environment and did further analysis on weak and multipath signal channel.(2).Based on acquisition processing for weak signal, this thesis analyzed and discussed critical algorithms in acquisition, including pre-detection SNR improving algorithms, detection algorithms and anti-multipath algorithms. Especially, it proposed a new detection algorithm based on peak position finding, which is possessed of lower detection SNR. Besides, AFPDI was also designed to make acquisition algorithm more robust in multipath scenarios. (3).Concerning code tracking technology for weak GNSS signal, this thesis demonstrated the math model for classical code tracking loop and analyzed thermal noise variance for loop performance. That is helpful to find the way to improve tracking sensitivity. To obtain better performance in anti-multipath, this thesis proposed two improved MEDLL and RLS algorithms based on the existing algorithm. Also, it employed simulations to compare performance of these different algorithms.(4).An implement scheme of weak GNSS signal receiver was described. According to this scheme, this thesis gave the results of FPGA test and satellite test for acquisition system. In addition, it simply introduced the modernization plan for GNSS, discussed BOC signal and future GPS signal and shared the prospect of future development and challenge in GNSS application.

Related Dissertations

  1. The Effect of Composite Additive on the SNCR,X701
  2. Study on a Pneumatic Manipulator Clamping Force Control System Based on H ∞ Control Theory,TP241
  3. Preparation and Properties of Chitosan-based Thermosensitive Composite Hydrogel,R943
  4. Isolation and Identification of Avian Pathogenic Escherichia Coli from Chicken and Characterizations of Its Virulence-Associated Genes,S852.61
  5. Luoyang Land the Use and Ecoloqical Environment Construction Coordination Study,X171
  6. Cloning and Characterization of Photoperiod Sensitive Gene ZmELF4 in Maize,S513
  7. Change and Value of Serum Soluble Lectin-Like Oxidized Low-Density Lipoprotein Receptor-1 in Acute Coronary Syndrome,R541.4
  8. Effects of Telmisartan on hs-CRP and HMW-adiponectinin Patients with Essential Hypertension,R544.1
  9. Study on Clinical Value of High-sensitivity Cardiac Troponin T Assay in Myocardial Infarction,R542.22
  10. Correlation Analysis between Coronary Lesion Severity and Peripheral Blood Cell CD34~+ Ratio in the Coronary Heart Disease Patients Complicating Diabetes Mellitus,R541.4
  11. The Study on Clinical Using of FISH and Cytology in Diagnosis and Surveillance of Recurrence in UC,R737.1
  12. Application and Significance of CISS Classification and TOAST Subtype on Ischemic Stroke (Attach 210 Cases Analysis),R743.3
  13. Ankle-brachial index combined ultra- sensitivity C-reactive protein determination of the value of coronary artery disease,R541.4
  14. Ischemic stroke and carotid atherosclerosis and related biochemical hs-CRP and LDL-C changes,R743.3
  15. Individuals with type 2 diabetes, serum complement factor H, hs-CRP levels and insulin resistance study,R587.1
  16. Aloe anthraquinones enhanced UV radiation on plant protection,X173
  17. To Explore the Value of Plasma NT-proBNP and Hypersensitive C-reactive Protein in Evaluating the Prognosis of the Patients with Acute Coronary Syndrome,R541.4
  18. Automatic Calibration System Voltage Monitor,TM933.2
  19. Research on NO-reference Image Quality Assessment Based on HVS,TP391.41
  20. Study of Static and Dynamic Collaborative Optimization on Container Ship Structure,U674.131
  21. The Sensitive Motivation Test of the Enterprise Investment - the Cash Flow,F224

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