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Research on Orientation Technology Based on Satellites Navigation System

Author: CuiJianYong
Tutor: YangLi
School: PLA Information Engineering University
Course: Navigation,Guidance and Control
Keywords: Satellite navigation system Directional precision of estimates Azimuth joint measurement Matlab simulation Baseline Error
CLC: P228.4
Type: Master's thesis
Year: 2008
Downloads: 88
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Abstract


In addition to satellite navigation and positioning system for navigation and precise positioning outside also widely used in precision directional. This paper focuses on the study based on the orientation of the satellite navigation system technology, the main content of the paper is summarized as follows: With GPS for example the use of its measurement mathematical model, and focuses on the mathematical model and a linear combination of GPS differential carrier phase measurements, given their characteristics, detailed analysis of the various error sources for short baseline measurement of carrier phase double difference. Expounded the basic principle and mathematical model of the GPS orientation. GPS orientation accuracy estimation formula is derived. The measured results show that the directional accuracy proportional to the baseline length, the baseline is longer the higher the directional accuracy when the baseline to reach a certain length, and then increase the length of no practical significance to improve the accuracy, but help improve directional stability of the results . The study showed that: the directional accuracy and measurement time orientation accuracy is gradually increased with the increase in the measuring time, when the measured time is reached after one hour, and the accuracy of orientation gradually stabilized. Research different solver with directional accuracy: L1 and L2 and Ln solution oriented high precision, and the use of Lc and Lw solution orientation estimation accuracy is poor, GPS measured data side of a multiple missile positions orientation and astronomical measurement data results compare various error analysis of directional accuracy, greater accuracy factors affect positions directional multi-path effect error, antenna phase center error and point of error, and coordinate conversion error can be negligible. Emergency ballistic missile motor launch position, measurement azimuth rapid determination of the issues, and is derived based on the The azimuth accuracy requirements strike azimuth side length formula, according to this formula list different tactical precision indicators corresponding side length. And compared the measured data, the correctness and reliability of this derivation formula. The software involved in the preparation of the rapid location and orientation, and made a spreadsheet to prove its directional precision is slightly better than commercial software. Elaborated based on binary single Epoch mathematical model and accuracy estimation formula, and then using Matlab simulation based on the Single Epoch mathematical model and accuracy estimation formulas baseline length observation epoch carrier phase measurement error, baseline length measurement error the the baseline elevation angle and azimuth and baseline which location and directional accuracy. Regional satellite navigation system carrier phase measurements Single Epoch mathematical model and the accuracy of the estimated formula is derived based on binary Single Epoch. Simulation directional precision baseline length, the carrier phase measurement error, azimuth and elevation angle. Simulation analysis of a regional day of Single Epoch results, analysis of the impact of directional accuracy of the geometry of the visible satellites, and in a local area single epoch based the binary single epoch directed and regional satellite navigation system directed to make a comparison of the results, the results show that a more substantial upgrade than binary directional accuracy of the regional satellite navigation system.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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