Improving the Performance of INS/GNSS System Using the Approach of Carrier Phase Measurements

Badshah Khan; Yong Yuan Qin

doi:10.4028/www.scientific.net/JERA.21.172

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Improving the Performance of INS/GNSS System Using the Approach of Carrier Phase Measurements

Abstract:

This paper discusses the techniques of attitude, velocity ad position estimation from GNSS carrier phase measurements, and investigates the performance of the lower precision MEMS based INS/GNSS system based on carrier phase measurements. Generally, a GPS receiver estimates the position and velocity from code phase and Doppler measurements. Double differenced carrier phase measurements provide more accurate velocity and position estimation compared to code and Doppler measurements. However, for position measurement, the integer ambiguity is required to be removed. Multiples antennae approach is used to derive the attitude information from carrier phase measurements in order to control the large initial misalignment angles for initialization of the integration process or to utilize during benign dynamics. Lever arm effect is considered to compensate for the separation of GNSS antenna and IMU location. The derived three GNSS observables are used to correct the INS through optimal Kalman filtering in a closed loop. Simulation results indicates the effectiveness of the integrated system for airborne as well as for land navigation vehicles.

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International Journal of Engineering Research in Africa Vol. 21

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Periodical:

International Journal of Engineering Research in Africa (Volume 21)

Pages:

172-183

DOI:

https://doi.org/10.4028/www.scientific.net/JERA.21.172

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Online since:

December 2015

Authors:

Badshah Khan*, Yong Yuan Qin

Keywords:

Carrier Phase, Doppler, GNSS, INS, Kalman Filtering, MEMS, Pseudo Range, Simulation

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