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Design and Implementation of an Embedded GPS Positioning Device Aided by Barometer

Author: ZuoMingChao
Tutor: HuangShengGuo
School: Nanjing University of Aeronautics and Astronautics
Course: Traffic Information Engineering \u0026 Control
Keywords: Global Positioning System barometric altimeter atmosphere pressure integrated positioning embedded Linux system
CLC: P228.4
Type: Master's thesis
Year: 2009
Downloads: 88
Quote: 5
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Abstract


The first and foremost problem for navigation is to position real-timely and exactly. Though Global Positioning System (GPS) is widely used at present, it is restrained due to its intrinsic errors. For instance when a vehicle (helicopter) is running in an urban canyon environment (a place where high buildings are on its both sides) or in a jam-paced place (mountainous area), things get more awful. In these situations, high buildings, high mountains and dense forest block GPS signals and there are not enough satellites signals in estimating the positions of the user. These factors will induce the decline of the position precision, which means the positioning precision cannot meet the requirement of the continuous and real time navigation.With a barometric altimeter as an assist device, the solution of position and clock bias during positioning failure can be obtained using a direct method described in this dissertation. This method uses barometric altitude to build an additional equation for position and clock bias computation. Our direct method could be used to initialize Kalman filter in altitude-hold mode or be used repeatedly in stand-alone mode in the case of satellite insufficiency.Precision of any integrated system relies on the precision of each component and the effectiveness of data fusion method. This dissertation begins with the calibration of a high precision barometer and error compensation as an attempt to enhance the precision of the barometric altimeter.This dissertation introduces the software and hardware design flow of the positioning system in detail. The integrated positioning system designed in this dissertation was composed of a GPS OEM board, a barometer and an embedded system.And the embedded system is consisted of ARM CPU, RAM, Flash, and other interface components. This dissertation developed positioning software on the platforms of embedded Linux and Qt, and implemented serial communication, positioning algorithm and application program with Qt.Finally, this dissertation analyzes the whole performance of the integrated system, and suggestes several ways to enhance the precision and performance of the integrated device.

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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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